{"product_id":"steam-oak-parnu-l-outdoor-sauna","title":"Steam \u0026 Oak Pärnu L Outdoor Sauna — 3–4 Person Thermowood, Corner Glass \u0026 Insulated Roof","description":"\u003cp\u003eMost garden saunas are a timber box with a door in it. The Pärnu L is a designed object: \u003cstrong\u003eblack-framed glass across the entire front\u003c\/strong\u003e, black trim, black bench fronts, and warm thermowood everywhere the eye lands. It is the one you put where people can see it, not down the end of the garden behind the shed.\u003c\/p\u003e\n\n\u003cp\u003eAt 2.29 m square it is the larger of the pair, with \u003cstrong\u003eglass wrapping the corner\u003c\/strong\u003e rather than sitting flat across the front — so the view opens up as you sit down. Four people fit on a proper two-level bench. It comes with its own \u003cstrong\u003ethermowood decking and ground frame\u003c\/strong\u003e, so it stands correctly on almost any level surface without you building a base for it.\u003c\/p\u003e\n\n\u003ch3\u003eUsually the quickest sauna we can get you\u003c\/h3\u003e\n\u003cp\u003eMost cabins in our Estonian range are made to order, and lead times run to several months when the factory is busy. The Pärnu is built on a different line and is \u003cstrong\u003eoften available in around six weeks — sometimes from stock\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you want a sauna this season rather than next, this is the one to ask about first. \u003cstrong\u003eTell us when you want it and we will tell you honestly whether it is achievable.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eBuilt like a building, not a kit\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e40 mm thermowood walls, and a roof insulated with 30 mm Kingspan\u003c\/strong\u003e under 18 mm thermowood boards — a warm roof in the building sense, not just a covered one. That is unusual at this size and it is why the room holds heat the way it does. Thermowood is timber kiln-treated at 180–220°C in a low-oxygen chamber: not a coating, but a change to the wood itself that closes the cells so it absorbs far less moisture. That is what stops outdoor timber cupping, twisting and splitting through a British winter, and it happens without chemical preservatives.\u003c\/p\u003e\n\u003cp\u003eThe floor and decking are 28 mm thermowood. The ground frame is pressure-treated. The trimming boards, bench fronts and backrest are painted black as standard — this is a finished product, not a shell you have to decorate.\u003c\/p\u003e\n\n\u003ch3\u003eSpecification\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCapacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3–4 people\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eExternal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2290 mm wide × 2290 mm deep × 2349 mm high\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInternal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1770 × 1770 × 2010 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSauna room volume\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6.3 m³\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWalls\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e40 mm thermowood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRoof\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30 mm Kingspan insulation, 18 mm thermowood inner boards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFloor and decking\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e28 mm thermowood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDoor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e700 × 1900 mm, 8 mm tempered bronze glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWindow\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e900 × 1900 mm, 6 mm tempered bronze glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBenches\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTwo levels, thermo-aspen with black-painted fronts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBackrest\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThermo-aspen, painted black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRoof finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-adhesive roofing felt with black metal flashing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat is in the box\u003c\/h3\u003e\n\u003cp\u003eEverything structural and every piece of trim. No hidden extras to buy before you can build it:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e40 mm thermowood wall panels\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eInsulated roof — 30 mm Kingspan with thermowood inner boards\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermowood decking\u003c\/strong\u003e and 28 mm floor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure-treated ground frame\u003c\/strong\u003e (44 × 90)\u003c\/li\u003e\n\u003cli\u003eTwo-level thermo-aspen benches with black-painted fronts\u003c\/li\u003e\n\u003cli\u003eThermo-aspen backrest, painted black\u003c\/li\u003e\n\u003cli\u003eTempered bronze glass door and window\u003c\/li\u003e\n\u003cli\u003eBlack trimming boards throughout\u003c\/li\u003e\n\u003cli\u003eSelf-adhesive roofing felt and black metal flashing\u003c\/li\u003e\n\u003cli\u003eScrews and fixings\u003c\/li\u003e\n\u003cli\u003eAssembly instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eA note on gas — not on this model\u003c\/h3\u003e\n\u003cp\u003eWe offer off-grid propane heaters across most of our range, and they are often the thing that makes a sauna possible in a garden with no power at the far end.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe Pärnu L is the exception.\u003c\/strong\u003e Its roof is insulated with 30 mm Kingspan under thermowood boards — a warm roof, and the reason this cabin holds heat so well. Cutting a gas flue cleanly through that build-up is not something we are willing to do as standard, because doing it badly compromises both the insulation and the fire detailing.\u003c\/p\u003e\n\u003cp\u003eIf off-grid running matters to you, look at the \u003ca href=\"\/products\/steam-oak-parnu-s-outdoor-sauna\"\u003ePärnu S\u003c\/a\u003e, which takes gas without difficulty, or ask us about the rest of the \u003ca href=\"\/collections\/gas-sauna-heaters\"\u003egas-ready range\u003c\/a\u003e. We would rather point you at the right cabin than sell you a compromise.\u003c\/p\u003e\n\n\u003ch3\u003eOr choose an electric heater\u003c\/h3\u003e\n\u003cp\u003eThe Pärnu L takes a \u003cstrong\u003ewall-mounted\u003c\/strong\u003e heater, which keeps the bench and floor space usable. Our Harvia Wall is black steel with a full \u003cstrong\u003e20 kg stone capacity\u003c\/strong\u003e for softer, steadier löyly, integrated controls and a 2-year warranty — and black steel is exactly right in this interior.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHarvia Wall 4.5 kW\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRated 3–6 m³. Just under this room, but the insulated roof makes it workable in a sheltered spot.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHarvia Wall 6 kW\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRated 5–8 m³ — \u003cstrong\u003ethe sensible default\u003c\/strong\u003e for a well-insulated 6.3 m³ room.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNo heater — cabin only\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSupply-only. Choose this if you already have a heater, or you want something we do not list.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eNot sure which?\u003c\/strong\u003e Ask us. This room is unusually well insulated for its size, so it does not need as much output as the volume suggests — we will match it properly rather than sell you the biggest one.\u003c\/p\u003e\n\u003cp\u003eAll electric heaters must be installed and connected by a qualified electrician. We confirm the exact supply requirement with you before installation.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003ePrefer a different heater — HUUM, a WiFi-controlled model, or a wood-burning stove? Choose cabin only and talk to us; we can supply and fit most makes.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003e2-year warranty\u003c\/h3\u003e\n\u003cp\u003eThe Pärnu L carries a \u003cstrong\u003e2-year warranty\u003c\/strong\u003e on the cabin structure, and the heaters carry their own manufacturer warranty.\u003c\/p\u003e\n\u003cp\u003eThermowood is stable and rot-resistant by nature, but like any outdoor timber it lasts longest if you treat the exterior and keep it treated. The black trim in particular repays maintenance. We will tell you exactly what to use and when.\u003c\/p\u003e\n\n\u003ch3\u003eLead time — ask us, this one is usually quick\u003c\/h3\u003e\n\u003cp\u003eUnlike most of the range, the Pärnu is often available in \u003cstrong\u003earound six weeks, and sometimes from stock\u003c\/strong\u003e. That said, lead times move with demand and specification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAsk us and we will give you the real date for your build before you commit\u003c\/strong\u003e — we would rather tell you the honest timescale up front than quote a comfortable number and disappoint you later.\u003c\/p\u003e\n\n\u003ch3\u003eGetting it into your garden\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase:\u003c\/strong\u003e level and well-drained. The pressure-treated ground frame is included, so a slab, paving or compacted gravel is all you need underneath. Allow \u003cstrong\u003e229 × 229 cm\u003c\/strong\u003e plus room to walk around it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess:\u003c\/strong\u003e delivered flat-packed, so the parts go through a standard side gate. No crane, no dismantling fences.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssembly:\u003c\/strong\u003e typically a day for two people, or leave it to our installation team.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSequence:\u003c\/strong\u003e most customers build the cabin first, then have the heater and lighting connected once it is in position.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eOptions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eExterior timber-protection finishes\u003c\/li\u003e\n\u003cli\u003eSauna accessory sets\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"Steam \u0026 Oak","offers":[{"title":"No heater — cabin only","offer_id":62484393918851,"sku":"SO-PARL-THW-SHELL","price":7500.0,"currency_code":"GBP","in_stock":true},{"title":"Harvia Wall 4.5 kW","offer_id":62484393984387,"sku":"SO-PARL-THW-HAR45","price":7949.0,"currency_code":"GBP","in_stock":true},{"title":"Harvia Wall 6 kW","offer_id":62484394017155,"sku":"SO-PARL-THW-HAR60","price":7989.0,"currency_code":"GBP","in_stock":true},{"title":"Harvia Wall 8 kW","offer_id":62484394049923,"sku":"SO-PARL-THW-HAR80","price":8029.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/1187\/1619\/files\/steam-oak-parnuL-3.jpg?v=1788022690","url":"https:\/\/www.steamandoak.co.uk\/products\/steam-oak-parnu-l-outdoor-sauna","provider":"Steam\u0026Oak","version":"1.0","type":"link"}