NOIR Dome — Commercial Gas Sauna | Up to 12 People | Twin 8.1 kW Heaters

Steam & Oak is the first UK retail partner for FinSteam. A 4 × 4 m octagonal sauna that seats up to 12 — and up to 14 when you need it. Two FinSteam 8.1 kW gas heaters bring it up to full heat in minutes and hold temperature through constant door-opening and back-to-back sessions. No fire to tend, no ash, no chimney, no electrician. For mobile-sauna hire, spas, retreats, festivals and glamping sites.

Choose your heater

The Dome takes two 8.1 kW gas heaters, and you pick which pair goes in:

• Botnia (£6,295) — the workhorse. Same 8.1 kW output, same built-in safety, simple manual control. The value choice for operators who run set sessions.
• Aurora (£6,995) — adds an integrated 60-minute safety timer to each heater (auto shut-off). Worth it in a busy public sauna where the heater runs unattended between guests. Our recommended commercial spec.

Everything else in the package is identical — same tent, benches, safety kit and warranty.

Why operators choose gas

• Ready in minutes, holds heat all day — gas heats directly, so it keeps up with a busy door.
• Up to 12 guests per session — real throughput from a single setup.
• No fire, ash, chimney or mains power — a two-person team can run it all day.
• Optional twin 60-minute safety timers (Aurora variant) auto shut-off — reassurance in a busy public sauna.
• 12-month warranty valid for commercial use.
• Built-in safety — oxygen-depletion cut-off, flame supervision and piezo ignition on both heaters. Bottles stay outside; only the hoses enter.

Honest operator notes: the Dome runs two propane bottles, needs mandatory ventilation sized for a full house, and wants roughly 5 × 5 m of clear, level ground. Follow the included commercial guidance.

What's included

• FinSteam Dome sauna tent (4 × 4 m, octagonal, up to 12 people)
• 2 × 8.1 kW gas heaters — your choice of Botnia (manual) or Aurora (with 60-minute safety timers)
• 3 × two-tier folding Western Red Cedar benches
• 2 × Halo safety rails + 2 × Njord heat shields
• Weatherproof cover
• 4 × outdoor deck chairs (cool-down seating)
• 2 × 40 kg sauna stones
• 2 × UK propane regulators + 1.2 m hoses
• Install, safety & commercial-use guide
• 12-month commercial warranty
• Free UK delivery

How the gas heat works — ready in about 15 minutes

Electric and wood heaters warm the room indirectly: they heat a big mass of stones first, which slowly warms the air — 30 to 45 minutes of waiting or fire-tending. A FinSteam gas heater is flueless and heats directly: it burns gas cleanly and puts the hot air and water vapour straight into the cabin, while the stones still heat for löyly. Nothing is stored first, nothing is lost up a chimney — so it's ready in about 15 minutes, on a dial. It also carries a soft, natural humidity from the moment it lights.

Full explainer: how a gas sauna heater works. Weighing up fuels? Wood-fired vs gas vs electric.

No electrician. No chimney. Off-grid.

It runs on standard propane bottles, so there's no electrician, no dedicated circuit and no Part P sign-off. No chimney means no smoke and no problem in a smoke-control area. Propane keeps working through a British winter — a genuine year-round commercial asset. Running cost is about £1.80 a session per heater.

The safety engineering

Gas in an enclosed space deserves serious engineering. Every FinSteam heater has an Oxygen Depletion Sensor (ODS) that shuts the gas off automatically if oxygen drops too low, flame supervision that cuts the gas the instant the flame is lost, and push-button piezo ignition. The cylinder always stays outside — only the hose enters — and correct ventilation is part of every install. EU type-examination certified under the Gas Appliance Regulation (2016/426). Choose the Aurora variant and each heater adds a 60-minute auto shut-off — especially reassuring in a busy public setting.

Why gas wins in busy and commercial saunas

The hardest thing for any public or mobile sauna is the door: every time it opens, hot air escapes and cold pours in. An electric or wood heater then sags while it slowly rebuilds heat from the stones. A flueless gas heater produces heat continuously and replaces the lost hot air the moment it escapes — so it holds temperature through constant use. It's why a well-specified 8.1 kW FinSteam heater keeps up where you'd expect to need far more power. The 12-month warranty applies to commercial use.

Heater specification (per heater, × 2)

• Power 8.1 kW; gas use ~0.59 kg/h; heat-up in minutes
• Integrated 60-minute safety timer (auto shut-off) — Aurora variant only
• Standard propane bottle, UK 37 mbar regulator included
• Oxygen-depletion cut-off, flame supervision, piezo ignition
• EU type-examined (A01/002220, AENOR nº 0099), CE marked

Compare the range

Gas value range: Ember Base · Ember Complete. Premium: NOIR L · NOIR XL · NOIR XXL. Commercial flagship: NOIR Dome (this page). Prefer the fire ritual? See our wood-fired saunas.

Fit & safety

Outdoor use only, on firm level ground with roughly 5 × 5 m clear. Both heaters' ventilation openings must stay clear while running. Deck chairs are for outdoor cool-down, not inside the hot tent. Full commercial guide included.