{"title":"Gas Sauna Heaters","description":"\u003cp\u003eFinSteam gas sauna heaters — 8.1 kW off-grid propane, CE-marked, hot in about 15 minutes with no electrician. Botnia 81 and Aurora 81, for retrofits and self-builds. Exclusively at Steam \u0026amp; Oak.\u003c\/p\u003e","products":[{"product_id":"gas-sauna-heater-botnia-81-8-1-kw-off-grid-propane-finsteam","title":"Gas Sauna Heater — Botnia 81, 8.1 kW Off-Grid Propane | FinSteam","description":"\u003cp\u003e\u003cem\u003eSteam \u0026amp; Oak is the first UK retail partner for FinSteam — bringing this Finnish gas sauna engineering to British gardens, off-grid cabins, custom builds and existing-sauna retrofits.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eThe original FinSteam gas heater — drop into your existing sauna, or build around it\u003c\/h2\u003e\n\u003cp\u003eThe Botnia 81 is the original FinSteam workhorse — 8.1 kW, certified, the heater that started the brand. Drop it into your existing barrel sauna, cube sauna, cabin, custom build, or off-grid setup; or buy it to specify a new sauna around. Connect a UK propane bottle outside via a 37 mbar regulator, light the heater, and you're in genuine 70-75°C Finnish sauna heat in 15 to 20 minutes. No electricity, no chimney, no flue. Turn the dial.\u003c\/p\u003e\n\n\u003ch2\u003eUpgrading your current sauna? Here's what fits where\u003c\/h2\u003e\n\u003cp\u003eThe Botnia 81 is certified as a \u003cstrong\u003estandalone gas appliance\u003c\/strong\u003e, which means it can be installed in any sauna structure provided you meet the FinSteam installation specifications (clearances, ventilation, base, gas connection). Common retrofit scenarios:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExisting barrel sauna with no heater fitted\u003c\/strong\u003e (very common with imported Eastern European barrels) — the Botnia 81 R11S or R14S is the typical pick. The Njord heat shield in the S variants halves the clearance to combustible timber, which makes it fit barrels where a base-config heater wouldn't.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExisting barrel \/ cabin with a tired wood-fired stove\u003c\/strong\u003e — replace it with a Botnia and you skip the chimney, the fire-tending, the 30-45 minute warm-up. Same sauna, a much better daily experience.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExisting electric sauna with a dead element\u003c\/strong\u003e — replace the element + heater + the consumer-unit + the electrician callout with a Botnia. No more sauna-trips-the-fuses, no more circuit upgrades.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom build \/ self-build\u003c\/strong\u003e — buy the Botnia 81 O (base, no cage) if you're sourcing your own Orbis cage, or any of the R configurations to ship matched and ready.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOff-grid cabin \/ cottage \/ Airbnb\u003c\/strong\u003e — the Botnia is the easiest way to add real sauna heat where the mains can't reach.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy a gas sauna heater (and why it beats wood-fired or electric)\u003c\/h2\u003e\n\u003cp\u003eFor owners considering an upgrade, the headline comparison:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003cth\u003eFinSteam gas\u003c\/th\u003e\n\u003cth\u003eWood-fired\u003c\/th\u003e\n\u003cth\u003eElectric\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat-up time\u003c\/td\u003e\n\u003ctd\u003e~15 minutes, turn a dial\u003c\/td\u003e\n\u003ctd\u003e30-45 minutes, tend a fire\u003c\/td\u003e\n\u003ctd\u003e30-60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower needed\u003c\/td\u003e\n\u003ctd\u003ePropane bottle\u003c\/td\u003e\n\u003ctd\u003eFirewood\u003c\/td\u003e\n\u003ctd\u003eMains — often a dedicated 32A circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrician \/ wiring\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eUsually required (£1-2k)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChimney\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eRequired\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSmoke, ash, soot\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eYes, every session\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHumidity\u003c\/td\u003e\n\u003ctd\u003eNaturally humid (combustion vapour stays in the cabin)\u003c\/td\u003e\n\u003ctd\u003eDry until you ladle\u003c\/td\u003e\n\u003ctd\u003eDry until you ladle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-grid\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl\u003c\/td\u003e\n\u003ctd\u003eDial\u003c\/td\u003e\n\u003ctd\u003eThe fire decides\u003c\/td\u003e\n\u003ctd\u003eThermostat \/ timer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety\u003c\/td\u003e\n\u003ctd\u003eEU-certified, auto oxygen shut-off\u003c\/td\u003e\n\u003ctd\u003eOpen flame\u003c\/td\u003e\n\u003ctd\u003eElectrical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorks in a power cut\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eA clever piece of engineering — the certified safety case\u003c\/h2\u003e\n\u003cp\u003eRunning gas safely inside a small, enclosed, oxygen-hungry space like a sauna is genuinely hard. FinSteam solved it with patented burner technology delivering clean, stable combustion, wrapped in two layers of automatic safety:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOxygen Depletion Sensor (ODS)\u003c\/strong\u003e — continuously monitors the oxygen level inside the sauna and automatically shuts off the gas if it drops to approximately 18% — well above any level dangerous to occupants. This is the same standard used in indoor gas appliances regulated by the EU.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlame monitoring\u003c\/strong\u003e — cuts the gas instantly if the flame is lost for any reason (e.g. accidental knock, sudden draft, gas supply interruption).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFinSteam's stated claim: this is the only CE-marked, electricity-free sauna gas heater on the European market. AENOR-tested under EU Gas Appliance Regulation 2016\/426. Across the last 12 months, FinSteam record \u003cstrong\u003ezero warranty returns on the heater\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eWill it fit my sauna?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulated saunas:\u003c\/strong\u003e 4 to 12 m³ internal volume — covers virtually every domestic barrel, cube, cabin and custom build.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-insulated saunas \/ tents \/ lightweight builds:\u003c\/strong\u003e 4 to 8 m³ — the lower insulation means less working volume.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating speed:\u003c\/strong\u003e 15 to 20 minutes from cold to 70-75°C in normal UK conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStone capacity:\u003c\/strong\u003e up to 20 kg with Orbis 11 cage, 25+ kg with Orbis 14.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClearance to combustible timber:\u003c\/strong\u003e 500 mm sides, 1200 mm ceiling. The Njord heat shield halves the side clearance to 250 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you're not sure your sauna fits the spec, send us the internal dimensions and a photo by WhatsApp or email — we'll tell you straight, before you commit.\u003c\/p\u003e\n\n\u003ch2\u003eKey specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e 8.1 kW.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas:\u003c\/strong\u003e UK propane (I3P, 37 mbar) — also factory-configured for butane\/propane mix (I3P\/B, 30 mbar) on request.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas consumption:\u003c\/strong\u003e 0.6 kg\/h at full output. A UK 13 kg propane bottle runs the heater at full output for around 20 hours; throttled at temperature, much longer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 61 × 51 × 30 cm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e ~9.8 kg (configuration-dependent).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat-up time:\u003c\/strong\u003e 15-20 minutes to 70-75°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSauna size range:\u003c\/strong\u003e 4-12 m³ insulated · 4-8 m³ non-insulated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety:\u003c\/strong\u003e EU Type-Examination Certificate (AENOR, Gas Appliance Regulation 2016\/426). ODS auto-shutoff. Flame monitoring.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhich configuration should I pick? — every variant explained\u003c\/h2\u003e\n\u003cp\u003eThe Botnia 81 ships in 5 configurations. The heater chassis is identical in every one — what changes is the cage and the safety pack:\u003c\/p\u003e\n\n\u003ch3\u003eBotnia 81 O — heater only, no cage (the bare base)\u003c\/h3\u003e\n\u003cp\u003eThe heater on its own, no Orbis cage included. Pick the O \u003cstrong\u003eonly if\u003c\/strong\u003e you already own a compatible Orbis cage from a previous FinSteam, or you're building a fully custom sauna and you want to specify the cage separately. For everyone else, the R11 is the cheapest sensible entry point — you need a cage to load stones, and Orbis is the cage FinSteam designed for this heater.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThis is the cheapest variant in the range and the most rarely picked — most retrofit buyers want at least the R11.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eBotnia 81 R11 — heater + Orbis 11 stone cage\u003c\/h3\u003e\n\u003cp\u003eThe default configuration for most domestic retrofits. The Orbis 11 cage takes 20-25 kg of sauna stones, which is the right thermal density for a 4-8 m³ sauna (most barrels, smaller cubes, smaller cabins). Pick R11 if you're retrofitting a domestic barrel (typical 3-5 m³ internal volume) or a small-to-medium cabin sauna, you don't need the safety pack, and you want the cheapest fully-functional configuration.\u003c\/p\u003e\n\n\u003ch3\u003eBotnia 81 R14 — heater + Orbis 14 stone cage\u003c\/h3\u003e\n\u003cp\u003eThe Orbis 14 holds 25 kg+ — more stones, more thermal mass, stronger löyly response when you ladle. Pick R14 if your sauna is on the larger side (8-12 m³ — bigger cabins, larger custom builds), or you specifically want a more powerful steam response from the stones. For a typical UK domestic barrel, the R11 is enough and the R14 is overkill.\u003c\/p\u003e\n\n\u003ch3\u003eBotnia 81 R11S — R11 + Njord heat shield + Halo safety rail (the safety pack)\u003c\/h3\u003e\n\u003cp\u003eThe \"S\" configuration adds two standard items to the heater:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNjord heat shield\u003c\/strong\u003e — a non-combustible steel shield between the heater and the timber walls of your sauna. \u003cstrong\u003eHalves the required clearance to combustible timber\u003c\/strong\u003e (500 mm sides → 250 mm). For most barrel saunas this is the difference between the heater fitting and not fitting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHalo safety rail\u003c\/strong\u003e — a wood-clad circular rail around the top of the heater. Prevents accidental contact with the hot stone cage during a session.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePick R11S if: you're retrofitting a tight barrel sauna where 500 mm side clearance won't fit, you have kids using the sauna, you're running any commercial \/ hire \/ holiday-let use, or you want a Gas Safe engineer or insurance broker to look at the install and see the full safety story. Standalone, the Njord retails at ~£189 and the Halo at ~£249 — buying both separately + the R11 base costs more than upgrading to the R11S in the package.\u003c\/p\u003e\n\n\u003ch3\u003eBotnia 81 R14S — R14 + Njord + Halo (the full safety pack with larger cage)\u003c\/h3\u003e\n\u003cp\u003eSame safety pack as R11S, but with the larger Orbis 14 cage. The flagship Botnia configuration. \u003cstrong\u003eWhat every commercial \/ hire operator should choose\u003c\/strong\u003e — bigger thermal mass for repeat sessions, full safety pack for insurance compliance. Also recommended for any household-with-kids retrofit into a larger cabin or barrel.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure?\u003c\/strong\u003e R11S is the sensible default for most domestic retrofits into existing barrel saunas. R14S is the default for commercial \/ hire use and larger builds.\u003c\/p\u003e\n\n\u003ch2\u003eThe components, explained individually\u003c\/h2\u003e\n\n\u003ch3\u003eOrbis 11 \/ Orbis 14 stone cage (included in R11\/R14\/R11S\/R14S)\u003c\/h3\u003e\n\u003cp\u003eThe Orbis is the FinSteam-designed stone cage that sits on top of the heater chassis. Fully compatible across all FinSteam heaters — including older Botnias bought before the Orbis line existed. Stone capacity 20-25 kg (11) or 25 kg+ (14). The cage is what holds the sauna stones in position above the burner — stones aren't just decoration, they're the thermal mass that gives you löyly when you ladle water on them. Most other stone cages aren't sized for this heater.\u003c\/p\u003e\n\n\u003ch3\u003eNjord heat shield (included in R11S\/R14S, sold standalone)\u003c\/h3\u003e\n\u003cp\u003eA non-combustible steel shield, designed by FinSteam, that sits between the heater and any timber surface. The shield reduces the radiated heat reaching the timber by enough that \u003cstrong\u003ethe required clearance to combustible timber drops from 500 mm to 250 mm\u003c\/strong\u003e on the sides. In practical terms: most UK domestic barrel saunas (and smaller cube saunas) don't have 500 mm of clear space around the heater position. The Njord makes them fit. \u003cstrong\u003eIf you're retrofitting an existing sauna, the Njord is usually the deciding factor on whether the install works at all.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eHalo safety rail (included in R11S\/R14S, sold standalone)\u003c\/h3\u003e\n\u003cp\u003eA circular wood-clad rail that fits around the top of the heater, preventing accidental contact with the hot stone cage during a session. Important in three scenarios: family use with children, commercial \/ hire \/ holiday-let use (insurers expect to see it), and tighter sauna interiors where bench positions are close to the heater.\u003c\/p\u003e\n\n\u003ch2\u003eThe full retrofit picture — what you'll need on top of the heater\u003c\/h2\u003e\n\u003cp\u003eIf you're retrofitting an existing sauna, the heater is the centrepiece but not the whole story. Plan for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUK propane regulator + hose kit (I3P 37 mbar, 27 mm clip-on for Calor bottles).\u003c\/strong\u003e FinSteam don't supply this — it's our \u003ca href=\"\/products\/uk-propane-regulator-hose-kit-i3p-37-mbar-for-finsteam-gas-sauna-heater\"\u003eUK gas kit\u003c\/a\u003e. Sold standalone, included in every NOIR package.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40 kg sauna stones\u003c\/strong\u003e sized for the Orbis cage. Sold \u003ca href=\"\/products\/40-kg-sauna-stones-finsteam-pre-washed-stones-for-orbis-cage\"\u003estandalone\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-combustible base for the heater\u003c\/strong\u003e — ≥30 mm thick, ≥300 × 300 mm (concrete slab or stone tile) directly beneath. Sourced locally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNatural ventilation provision\u003c\/strong\u003e in your sauna structure: air intake ≥350 cm² low next to the heater, air exhaust ≥250 cm² high in the opposite corner. Both must draw fresh air from outside and discharge directly to outside — wooden louvre vents only, not plastic disc\/twist valves. If your existing sauna doesn't have this, you'll need to retrofit the vents before the heater can be used.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard UK 13 kg Calor propane bottle\u003c\/strong\u003e (or larger for commercial use) — bought locally from BBQ \/ camping \/ petrol-station retailers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIf you're doing a fixed install\u003c\/strong\u003e (heater anchored into the sauna): a Gas Safe registered engineer to make the gas connection. UK law.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePortable by default. Gas Safe registered if you fix it down.\u003c\/h2\u003e\n\u003cp\u003eThe heater ships as a portable LPG appliance. You connect a UK propane bottle outside via a UK-spec 37 mbar regulator and CE-marked hose — set up like a patio heater or BBQ. Used this way, \u003cstrong\u003eyou do not need a Gas Safe registered engineer\u003c\/strong\u003e. If you choose to permanently fix, bolt down, or build the heater into a fixed sauna structure (most retrofit installs do this), \u003cstrong\u003eUK regulations require the gas connection to be made by a Gas Safe registered engineer\u003c\/strong\u003e. Either path is supported by FinSteam's installation specifications.\u003c\/p\u003e\n\n\u003ch2\u003eInstall requirements (mandatory)\u003c\/h2\u003e\n\u003cp\u003eThe Botnia 81 ships with FinSteam's installation manual. The headline requirements you should design around BEFORE buying:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNatural ventilation only.\u003c\/strong\u003e No mechanical \/ fan ventilation — gas heaters must NOT be used in mechanically ventilated saunas. Air intake ≥350 cm² low next to the heater (examples: 200×175 mm or 250×140 mm rectangular, or Ø210 mm circular). Air exhaust ≥250 cm² high in the opposite corner. Wooden louvre vents only — NOT round plastic disc \/ twist valves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClearance to combustible timber:\u003c\/strong\u003e 500 mm sides, 1200 mm ceiling. The Njord heat shield (R11S \/ R14S) halves the side distance to 250 mm. A fire-protection stone board on panelled walls quarters it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-combustible base:\u003c\/strong\u003e ≥30 mm thick, ≥300 × 300 mm beneath the heater.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas connection:\u003c\/strong\u003e CE-marked hose with internal Ø ≥ 9 mm, fixed at both ends, kink-free. UK 37 mbar propane regulator. Propane bottle outside, upright, stable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFull installation PDF on request. \u003cstrong\u003eSend us your retrofit plan before you commit — we'll review it with you, free, and tell you what to change.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eMade in Finland. Backed by a track record.\u003c\/h2\u003e\n\u003cp\u003eManufactured in Finland by FinSteam Ab Oy, with all heater components sourced from Europe — not a re-badge of an Asian import. Spare parts ship direct from the FinSteam factory. EU Type-Examination Certificate (AENOR-tested under Gas Appliance Regulation 2016\/426). As the official first UK retail partner, Steam \u0026amp; Oak holds UK stock, handles UK service and warranty work, and gives you a real phone number when something needs attention. \u003cstrong\u003eZero warranty returns on the heater across the last 12 months.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eComplete the install\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUK propane regulator + CE-marked hose kit\u003c\/strong\u003e (I3P 37 mbar, 27 mm clip-on for Calor 13 kg bottles) — the missing piece between the heater and your first burn. Not supplied with the heater.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40 kg sauna stones\u003c\/strong\u003e — pre-washed, sized for the Orbis cage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrbis 11 or Orbis 14 stone cage\u003c\/strong\u003e — if you bought the Botnia 81 O base, or you're upgrading an older Botnia.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNjord heat shield + Halo safety rail\u003c\/strong\u003e — if you didn't pick an S variant.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinSteam Fritid tent\u003c\/strong\u003e — if you're building a portable setup around the heater rather than retrofitting an existing structure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDelivery + documents\u003c\/h2\u003e\n\u003cp\u003eFree UK delivery on the heater. Stock status and lead time shown above the buy button.\u003c\/p\u003e\n\u003cp\u003eDocuments available on request: EU Type-Examination Certificate (AENOR) · EU Declaration of Conformity · Installation \u0026amp; safety manual · Ventilation specification · UK gas connection guide.\u003c\/p\u003e\n\n\u003ch2\u003eFAQs — retrofit-focused\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eI have an existing wood-fired barrel sauna. Can I convert it to gas with the Botnia?\u003c\/strong\u003e\u003cbr\u003eYes — and it's one of the most common retrofit scenarios we see. Remove the wood stove and its flue, seal the flue penetration in the roof, fit the Botnia 81 on a non-combustible base in the same position (the sauna will already have approximately the right airflow because it was designed around the wood stove). You'll need to fit FinSteam-spec natural ventilation if the existing vents are mechanical \/ closable plastic disc types. Most barrel sauna conversions need the R11S configuration (Njord heat shield to halve the clearance to the curved timber walls). Send us a photo of your barrel before you order — we'll tell you what you need.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMy electric sauna heater has died. Can I swap it for the Botnia?\u003c\/strong\u003e\u003cbr\u003eYes — and you save the £1-2k electrician cost for replacing the electrical install. Remove the old electric heater and its wiring (electrically isolate properly). Fit the Botnia on a non-combustible base — most electric saunas already have the right base. You'll need to add a wall gland for the gas hose, and provide natural ventilation if the existing was mechanical. The cabin's existing insulation works fine for gas — you're just changing the heat source. Worth checking the cabin volume sits within the Botnia's 4-12 m³ insulated spec before you commit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWill it fit my cube \/ cabin sauna with limited clearance?\u003c\/strong\u003e\u003cbr\u003eProbably yes with the R11S or R14S — the Njord heat shield drops the required side clearance from 500 mm to 250 mm. Most UK cube saunas (4-8 m³) work with the Njord; some very tight installs need a fire-protection stone board on the wall to quarter the clearance to 125 mm.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo I need a Gas Safe engineer to install this in my existing sauna?\u003c\/strong\u003e\u003cbr\u003eDepends on the install. If you use it portably (heater stands on the base, propane bottle outside, gas hose runs through a wall gland) — no, you don't. If you permanently fix the heater into the sauna structure (anchored, gas line routed and fixed) — yes, UK regulations require a Gas Safe registered engineer for the gas connection. Most retrofit installs go the fixed route because it's neater.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat about ventilation in my existing barrel — what do I need to check?\u003c\/strong\u003e\u003cbr\u003eFinSteam require natural (gravity) ventilation only. Air intake ≥350 cm² low next to the heater, taken from outside. Air exhaust ≥250 cm² high in the opposite corner, discharged directly to outside. Wooden louvre vents — NOT plastic disc valves (FinSteam specifically exclude these). If your existing sauna has plastic disc vents, you'll need to swap them. If it has mechanical \/ fan ventilation, you need to remove it — gas heaters cannot be used with mechanical ventilation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow does the Botnia compare to the Aurora 81?\u003c\/strong\u003e\u003cbr\u003eSame 8.1 kW chassis, same patented burner, same certifications, same safety case, same heat-up time, same löyly response, same heating performance. The Aurora is FinSteam's newer premium line — more modern design language, intended for builds where the heater is part of the aesthetic. The Botnia is the original — slightly lower price, identical performance. \u003cstrong\u003eIf function-per-pound matters most, the Botnia is the smarter buy.\u003c\/strong\u003e If you want the newest FinSteam product, look at the \u003ca href=\"\/products\/premium-gas-sauna-heater-aurora-81-finsteam\"\u003eAurora 81\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat stones go in the cage — can I use barbecue lava rocks?\u003c\/strong\u003e\u003cbr\u003eNo — sauna stones are specifically sized and selected for thermal cycling. Lava rocks crack and shatter under repeated heating. Use proper \u003ca href=\"\/products\/40-kg-sauna-stones-finsteam-pre-washed-stones-for-orbis-cage\"\u003eFinSteam sauna stones\u003c\/a\u003e, sized for the Orbis cage. They last 2-3 years of heavy use; 40 kg is enough to fill the cage with proper thermal density.\u003c\/p\u003e","brand":"FinSteam","offers":[{"title":"O — heater only (no cage)","offer_id":58204796256643,"sku":"FS-BOT81-O","price":1595.0,"currency_code":"GBP","in_stock":true},{"title":"R11 — heater + Orbis 11 cage","offer_id":58204796289411,"sku":"FS-BOT81-R11","price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"R14 — heater + Orbis 14 cage","offer_id":58204796322179,"sku":"FS-BOT81-R14","price":1795.0,"currency_code":"GBP","in_stock":true},{"title":"R11S — R11 + Njord shield + Halo rail","offer_id":58204796354947,"sku":"FS-BOT81-R11S","price":1995.0,"currency_code":"GBP","in_stock":true},{"title":"R14S — R14 + Njord shield + Halo rail","offer_id":58204796387715,"sku":"FS-BOT81-R14S","price":2095.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/1187\/1619\/files\/Botnia81high-3.jpg?v=1780943869"},{"product_id":"premium-gas-sauna-heater-aurora-81-8-1-kw-off-grid-propane-finsteam","title":"Premium Gas Sauna Heater — Aurora 81, 8.1 kW Off-Grid Propane | FinSteam","description":"\u003cp\u003e\u003cem\u003eSteam \u0026amp; Oak is the first UK retail partner for FinSteam — bringing this Finnish gas sauna engineering to British gardens, off-grid cabins, custom builds and existing-sauna retrofits.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eThe premium FinSteam gas heater — modern design, certified, retrofit-ready\u003c\/h2\u003e\n\u003cp\u003eThe Aurora 81 is FinSteam's newer premium 8.1 kW gas sauna heater — the next-generation evolution of the Botnia. Same patented burner technology, same certified safety case, same off-grid propane operation, same 15-20 minute heat-up. What you're buying with the Aurora is the modern design language and broader sauna-type adaptability — intended for retrofits where the heater itself is part of the aesthetic, glass-fronted cabin saunas, premium custom builds, and any commercial setup where the visible heater quality matters.\u003c\/p\u003e\n\n\u003ch2\u003eUpgrading your current sauna? Here's where the Aurora fits\u003c\/h2\u003e\n\u003cp\u003eThe Aurora 81 is certified as a \u003cstrong\u003estandalone gas appliance\u003c\/strong\u003e — it can be installed in any sauna structure provided you meet the FinSteam installation specifications. Common retrofit scenarios where Aurora is the right pick over the Botnia:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlass-fronted or design-led cabin sauna\u003c\/strong\u003e — the heater is visible, so the design language matters. Aurora's modern finish reads better than the Botnia's workhorse aesthetic.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium custom build\u003c\/strong\u003e — architect-led or designer-led sauna projects where the heater is treated as a design element.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-end holiday let \/ boutique Airbnb\u003c\/strong\u003e — guests see the heater. Aurora supports the premium positioning of the rental.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial \/ hire setup where the equipment is on display\u003c\/strong\u003e — events, pop-ups, festival use, retreat venues. The Aurora R14S is the configuration most premium operators choose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacing a tired electric heater in a quality cabin\u003c\/strong\u003e — keep the existing build, upgrade the heart of it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOff-grid cabin \/ cottage build\u003c\/strong\u003e where you're not constrained by budget and want the newer FinSteam product.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIf function-per-pound is the priority\u003c\/strong\u003e — buy the \u003ca href=\"\/products\/gas-sauna-heater-botnia-81-off-grid-propane-finsteam\"\u003eBotnia 81\u003c\/a\u003e instead. Heating performance is identical. The Aurora's £200-300 premium over the equivalent Botnia variant pays for design, not capability.\u003c\/p\u003e\n\n\u003ch2\u003eWhy a gas sauna heater (and why it beats wood-fired or electric)\u003c\/h2\u003e\n\u003cp\u003eFor owners considering an upgrade, the headline comparison:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003cth\u003eFinSteam gas\u003c\/th\u003e\n\u003cth\u003eWood-fired\u003c\/th\u003e\n\u003cth\u003eElectric\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat-up time\u003c\/td\u003e\n\u003ctd\u003e~15 minutes, turn a dial\u003c\/td\u003e\n\u003ctd\u003e30-45 minutes, tend a fire\u003c\/td\u003e\n\u003ctd\u003e30-60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower needed\u003c\/td\u003e\n\u003ctd\u003ePropane bottle\u003c\/td\u003e\n\u003ctd\u003eFirewood\u003c\/td\u003e\n\u003ctd\u003eMains — often a dedicated 32A circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrician \/ wiring\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eUsually required (£1-2k)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChimney\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eRequired\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSmoke, ash, soot\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eYes, every session\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHumidity\u003c\/td\u003e\n\u003ctd\u003eNaturally humid (combustion vapour stays in the cabin)\u003c\/td\u003e\n\u003ctd\u003eDry until you ladle\u003c\/td\u003e\n\u003ctd\u003eDry until you ladle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-grid\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl\u003c\/td\u003e\n\u003ctd\u003eDial\u003c\/td\u003e\n\u003ctd\u003eThe fire decides\u003c\/td\u003e\n\u003ctd\u003eThermostat \/ timer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety\u003c\/td\u003e\n\u003ctd\u003eEU-certified, auto oxygen shut-off\u003c\/td\u003e\n\u003ctd\u003eOpen flame\u003c\/td\u003e\n\u003ctd\u003eElectrical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorks in a power cut\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eA clever piece of engineering — the certified safety case\u003c\/h2\u003e\n\u003cp\u003eRunning gas safely inside a small, enclosed, oxygen-hungry space is genuinely hard. FinSteam solved it with patented burner technology delivering clean, stable combustion, wrapped in two layers of automatic safety:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOxygen Depletion Sensor (ODS)\u003c\/strong\u003e — continuously monitors oxygen levels and automatically shuts off the gas if levels drop to approximately 18% — well above any level dangerous to occupants. Same standard used in indoor gas appliances regulated by the EU.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlame monitoring\u003c\/strong\u003e — cuts the gas instantly if the flame is lost for any reason.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFinSteam's stated claim: the only CE-marked, electricity-free sauna gas heater on the European market. AENOR-tested under EU Gas Appliance Regulation 2016\/426. Across the last 12 months, FinSteam record \u003cstrong\u003ezero warranty returns on the heater\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eWill it fit my sauna?\u003c\/h2\u003e\n\u003cp\u003eIdentical compatibility profile to the Botnia 81 — same chassis, same dimensions, same heating range:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulated saunas:\u003c\/strong\u003e 4 to 12 m³ internal volume.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-insulated saunas \/ tents \/ lightweight builds:\u003c\/strong\u003e 4 to 8 m³.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating speed:\u003c\/strong\u003e 15 to 20 minutes from cold to 70-75°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStone capacity:\u003c\/strong\u003e up to 20-25 kg with Orbis 11 cage, 25+ kg with Orbis 14.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClearance to combustible timber:\u003c\/strong\u003e 500 mm sides, 1200 mm ceiling. Njord heat shield halves the side clearance to 250 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure your sauna fits? Send us internal dimensions + a photo by WhatsApp or email — we'll tell you straight before you commit.\u003c\/p\u003e\n\n\u003ch2\u003eKey specifications\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eIdentical to the Botnia 81 — same chassis, same dimensions, same gas consumption, same certifications. The Aurora's difference is design and finish, not power.\u003c\/em\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e 8.1 kW.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas:\u003c\/strong\u003e UK propane (I3P, 37 mbar).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas consumption:\u003c\/strong\u003e 0.6 kg\/h at full output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 61 × 51 × 30 cm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e ~9.8 kg.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat-up time:\u003c\/strong\u003e 15-20 minutes to 70-75°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSauna size range:\u003c\/strong\u003e 4-12 m³ insulated · 4-8 m³ non-insulated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety:\u003c\/strong\u003e EU Type-Examination Certificate (AENOR, Gas Appliance Regulation 2016\/426). ODS auto-shutoff. Flame monitoring.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhich configuration should I pick? — every Aurora variant explained\u003c\/h2\u003e\n\u003cp\u003eThe Aurora 81 ships in 4 configurations (no base \"O\" — Aurora always ships with at least the Orbis 11 cage as the entry point, reflecting its premium positioning).\u003c\/p\u003e\n\n\u003ch3\u003eAurora 81 R11 — heater + Orbis 11 stone cage\u003c\/h3\u003e\n\u003cp\u003eThe entry Aurora. The Orbis 11 cage holds 20-25 kg of sauna stones — the right thermal density for a typical 4-8 m³ domestic sauna (most barrels, smaller cubes, smaller cabins). Pick R11 if you want the Aurora's design language at the lowest price point and your sauna sits in the small-to-medium range.\u003c\/p\u003e\n\n\u003ch3\u003eAurora 81 R14 — heater + Orbis 14 stone cage\u003c\/h3\u003e\n\u003cp\u003eLarger cage, 25 kg+ stone capacity. Pick R14 if your sauna is on the larger side (8-12 m³ — bigger cabins, larger custom builds) and you want stronger löyly response, or you're upgrading a sauna that already had a similarly-sized wood stove.\u003c\/p\u003e\n\n\u003ch3\u003eAurora 81 R11S — R11 + Njord heat shield + Halo safety rail (the safety pack)\u003c\/h3\u003e\n\u003cp\u003eThe Aurora R11S adds the FinSteam safety pack as standard:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNjord heat shield\u003c\/strong\u003e — non-combustible steel shield between the heater and timber walls. Halves the required clearance to combustible timber (500 mm sides → 250 mm) — the difference between fitting and not fitting in a tight retrofit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHalo safety rail\u003c\/strong\u003e — wood-clad rail around the heater top, prevents accidental contact with the hot stone cage during a session.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePick R11S if: you're retrofitting a tight sauna where 500 mm side clearance won't fit, you have kids using the sauna, you're running any commercial \/ hire use, or you want the full safety story documented for insurance \/ Gas Safe sign-off. Standalone, Njord ~£189 and Halo ~£249 — the upgrade from R11 to R11S is the cheapest way to get both.\u003c\/p\u003e\n\n\u003ch3\u003eAurora 81 R14S — R14 + Njord + Halo (the flagship configuration)\u003c\/h3\u003e\n\u003cp\u003eThe flagship Aurora — premium heater, larger cage, full safety pack. \u003cstrong\u003eWhat every premium custom build, every commercial \/ hire operator, and every architect-led sauna project should choose.\u003c\/strong\u003e Also the heater configuration FinSteam build into the NOIR XL Signature and XXL Signature packages — the standard for the FinSteam top-tier specifications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure?\u003c\/strong\u003e R14S is the sensible default for premium retrofit \/ commercial use. R11S is the smarter buy for tight domestic retrofits where the larger cage isn't needed.\u003c\/p\u003e\n\n\u003ch2\u003eThe components, explained individually\u003c\/h2\u003e\n\n\u003ch3\u003eOrbis 11 \/ Orbis 14 stone cage (included in all 4 Aurora variants)\u003c\/h3\u003e\n\u003cp\u003eThe Orbis is the FinSteam-designed stone cage that sits on top of the heater chassis. Stone capacity 20-25 kg (Orbis 11) or 25 kg+ (Orbis 14). The cage holds the sauna stones in the right position above the burner — stones are the thermal mass that gives you löyly when you ladle water on them. Most other stone cages aren't sized for this heater; the Orbis is.\u003c\/p\u003e\n\n\u003ch3\u003eNjord heat shield (included in R11S\/R14S)\u003c\/h3\u003e\n\u003cp\u003eA non-combustible steel shield designed by FinSteam that sits between the heater and any timber surface. \u003cstrong\u003eHalves the required clearance to combustible timber from 500 mm to 250 mm on the sides.\u003c\/strong\u003e In practical retrofit terms: most UK domestic barrel saunas (and smaller cube saunas) don't have 500 mm of clear space around the heater position. The Njord makes them fit. \u003cstrong\u003eIf you're retrofitting an existing sauna, the Njord is usually the deciding factor on whether the install works.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eHalo safety rail (included in R11S\/R14S)\u003c\/h3\u003e\n\u003cp\u003eA circular wood-clad rail around the top of the heater. Prevents accidental contact with the hot stone cage during a session. Important for: family use with children, commercial \/ hire \/ holiday-let use (insurers expect to see it), and tighter sauna interiors where bench positions are close to the heater.\u003c\/p\u003e\n\n\u003ch2\u003eThe full retrofit picture — what you'll need on top of the heater\u003c\/h2\u003e\n\u003cp\u003eIf you're retrofitting an existing sauna, the heater is the centrepiece but not the whole story. Plan for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUK propane regulator + hose kit (I3P 37 mbar, 27 mm clip-on for Calor bottles).\u003c\/strong\u003e FinSteam don't supply this — it's our \u003ca href=\"\/products\/uk-propane-regulator-hose-kit-i3p-37-mbar-for-finsteam-gas-sauna-heater\"\u003eUK gas kit\u003c\/a\u003e. Sold standalone, included in every NOIR package.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40 kg sauna stones\u003c\/strong\u003e sized for the Orbis cage. Sold \u003ca href=\"\/products\/40-kg-sauna-stones-finsteam-pre-washed-stones-for-orbis-cage\"\u003estandalone\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-combustible base for the heater\u003c\/strong\u003e — ≥30 mm thick, ≥300 × 300 mm (concrete slab or stone tile) directly beneath. Sourced locally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNatural ventilation provision\u003c\/strong\u003e: air intake ≥350 cm² low next to the heater, air exhaust ≥250 cm² high in the opposite corner. Both must draw fresh air from outside and discharge directly to outside. Wooden louvre vents only — not plastic disc\/twist valves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard UK 13 kg Calor propane bottle\u003c\/strong\u003e (or larger for commercial use).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIf you're doing a fixed install\u003c\/strong\u003e: a Gas Safe registered engineer for the gas connection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePortable by default. Gas Safe registered if you fix it down.\u003c\/h2\u003e\n\u003cp\u003eThe heater ships as a portable LPG appliance. Connect a UK propane bottle outside via a 37 mbar regulator and CE-marked hose — set up like a patio heater or BBQ. Used this way, \u003cstrong\u003eyou do not need a Gas Safe registered engineer\u003c\/strong\u003e. If you choose to permanently fix the heater into a fixed sauna structure (most retrofit installs do this), \u003cstrong\u003eUK regulations require the gas connection to be made by a Gas Safe registered engineer\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eInstall requirements (mandatory)\u003c\/h2\u003e\n\u003cp\u003eSame install spec as the Botnia 81 — the heater chassis is the same:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNatural ventilation only.\u003c\/strong\u003e No mechanical \/ fan ventilation. Air intake ≥350 cm² low next to the heater, drawn from outside. Air exhaust ≥250 cm² high in the opposite corner, discharged to outside. Wooden louvre vents only — NOT round plastic disc \/ twist valves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClearance to combustible timber:\u003c\/strong\u003e 500 mm sides, 1200 mm ceiling. Njord halves the side distance to 250 mm. Fire-protection stone board on panelled walls quarters it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-combustible base:\u003c\/strong\u003e ≥30 mm thick, ≥300 × 300 mm beneath the heater.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas connection:\u003c\/strong\u003e CE-marked hose, internal Ø ≥ 9 mm, UK 37 mbar propane regulator, propane bottle outside.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFull PDF spec on request. \u003cstrong\u003eSend us your retrofit plan before you commit — we'll review it with you, free, and tell you what to change.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eMade in Finland. Backed by a track record.\u003c\/h2\u003e\n\u003cp\u003eManufactured in Finland by FinSteam Ab Oy, with all heater components sourced from Europe. Spare parts ship direct from the FinSteam factory. EU Type-Examination Certificate (AENOR-tested, Gas Appliance Regulation 2016\/426). UK stock + UK service + UK phone support through Steam \u0026amp; Oak as the official first UK retail partner. \u003cstrong\u003eZero warranty returns on the heater across the last 12 months.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eComplete the install\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUK propane regulator + CE-marked hose kit\u003c\/strong\u003e — not supplied with the heater.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40 kg sauna stones\u003c\/strong\u003e — sized for the Orbis cage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrbis 14 stone cage\u003c\/strong\u003e — if you bought the R11 variant and want to upgrade later.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNjord heat shield + Halo safety rail\u003c\/strong\u003e — if you didn't pick an S variant.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinSteam Fritid X premium tent\u003c\/strong\u003e — for premium portable use, the tent FinSteam build into their NOIR Signature packages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNOIR L Elite \/ XL Signature \/ XXL Signature\u003c\/strong\u003e — if you're not retrofitting an existing sauna and you want the complete portable package built around the Aurora.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDelivery + documents\u003c\/h2\u003e\n\u003cp\u003eFree UK delivery. Stock status and lead time shown above the buy button.\u003c\/p\u003e\n\u003cp\u003eDocuments available on request: EU Type-Examination Certificate (AENOR) · EU Declaration of Conformity · Installation \u0026amp; safety manual · Ventilation spec · UK gas connection guide.\u003c\/p\u003e\n\n\u003ch2\u003eFAQs — retrofit-focused\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's actually different about the Aurora vs the Botnia?\u003c\/strong\u003e\u003cbr\u003eDesign language and finish. The Aurora is FinSteam's newer line — modern aesthetic, broader sauna-type adaptability, intended for builds where the heater is part of the design. The chassis, power, certifications, ODS, flame monitoring, heat-up time, gas consumption and löyly response are identical. \u003cstrong\u003eYou're paying for the design, not the heating capability.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eI have a glass-fronted cabin sauna. Is the Aurora the right pick?\u003c\/strong\u003e\u003cbr\u003eYes — this is one of the scenarios where Aurora's design language pays off. The heater will be visible through the glass, so the modern finish reads better than the Botnia's workhorse aesthetic. The R14S is typical for premium glass-fronted retrofits — the safety pack is what most professional installers expect to see on the visible heater.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eI'm replacing a tired electric heater in my existing cabin. Botnia or Aurora?\u003c\/strong\u003e\u003cbr\u003eFunction-wise, identical. Aesthetic-wise, depends on your cabin. If the cabin is a quality build (cedar, hemlock, designed sauna), the Aurora justifies the £200-300 premium per variant. If it's a budget cabin where the heater isn't on display, the Botnia is the smarter buy.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eI have an existing wood-fired sauna. Can I convert it to Aurora?\u003c\/strong\u003e\u003cbr\u003eYes — same retrofit process as a Botnia conversion. Remove the wood stove + flue, seal the roof penetration, fit the Aurora on a non-combustible base. Add FinSteam-spec natural ventilation if needed (wooden louvres, sized per spec). The R14S is the typical premium conversion configuration.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWill it fit my barrel sauna?\u003c\/strong\u003e\u003cbr\u003eProbably yes with the R14S — the Njord heat shield drops the required side clearance from 500 mm to 250 mm. Most barrel saunas work with the Njord. Tight installs may need a fire-protection stone board to quarter the clearance to 125 mm. Send us a photo of the barrel before you order.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo I need a Gas Safe engineer?\u003c\/strong\u003e\u003cbr\u003eNot for portable use (heater stands on the base, bottle outside, hose through a wall gland). Yes for any fixed install — UK regulations require a Gas Safe registered engineer for the gas connection.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat about ventilation in my existing sauna?\u003c\/strong\u003e\u003cbr\u003eCheck that your existing sauna has natural (gravity) ventilation only — no mechanical \/ fan ventilation, no plastic disc \/ twist valves. FinSteam specify wooden louvre vents: ≥350 cm² intake near the heater, ≥250 cm² exhaust in the opposite high corner, both drawing fresh air from outside and discharging to outside. If your existing vents don't match this, you'll need to retrofit them before the heater can be used.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I run the Aurora 81 in a FinSteam Fritid X tent?\u003c\/strong\u003e\u003cbr\u003eYes — the Fritid X is engineered for the same 8.1 kW heater chassis. Many premium portable buyers run an Aurora R14S inside a Fritid X. The four \u003ca href=\"\/products\/noir-l-elite-finsteam-premium-portable-sauna-for-2-4-people-aurora-heater\"\u003eNOIR packages\u003c\/a\u003e are built around exactly this pairing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat stones go in the Orbis cage?\u003c\/strong\u003e\u003cbr\u003eUse proper \u003ca href=\"\/products\/40-kg-sauna-stones-finsteam-pre-washed-stones-for-orbis-cage\"\u003eFinSteam sauna stones\u003c\/a\u003e, sized for the cage. They last 2-3 years of heavy use; 40 kg is enough for proper thermal density.\u003c\/p\u003e","brand":"FinSteam","offers":[{"title":"R11 — heater + Orbis 11 cage","offer_id":58204827091331,"sku":"FS-AUR81-R11","price":1895.0,"currency_code":"GBP","in_stock":true},{"title":"R14 — heater + Orbis 14 cage","offer_id":58204827124099,"sku":"FS-AUR81-R14","price":1995.0,"currency_code":"GBP","in_stock":true},{"title":"R11S — R11 + Njord shield + Halo rail","offer_id":58204827156867,"sku":"FS-AUR81-R11S","price":2295.0,"currency_code":"GBP","in_stock":true},{"title":"R14S — R14 + Njord shield + Halo rail","offer_id":58204827189635,"sku":"FS-AUR81-R14S","price":2395.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/1187\/1619\/files\/Aurora-hero.jpg?v=1780939829"}],"url":"https:\/\/www.steamandoak.co.uk\/collections\/gas-sauna-heaters.oembed","provider":"Steam\u0026Oak","version":"1.0","type":"link"}