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Price: 11700.00 GBP
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Steam & Oak Kaari 300 Sauna Pod — 6 Person Thermowood with Covered Terrace - No heater — cabin only
The Kaari 300 is the largest oval we will fit a gas heater to, and the one with a covered terrace built into the shell. Three metres across rather than 2.4, with the roof carried out over a seating area at the front — so the cooling-off part of the session happens under cover, in a British garden, in October. Same construction as the rest of the range: 42 mm thermowood side walls, thermo-aspen benches, and a two-room layout with a proper changing room. The terrace end carries a built-in log store under the curve of the shell — which is exactly where you want the wood if you are running it on a stove. The layout is the point The Kaari 300 is divided into two rooms with the heater on the dividing wall, and the terrace beyond that again. The whole shell is around 19 m³. Heat all of that and you are into 12–18 kW territory and an electrical supply to match. Because it is partitioned, the heated room is about 9 m³ — a size a normal heater handles properly, and the largest room in our oval range that an off-grid gas heater will still serve. The changing room stays cool, so the hot room stays hot when people come and go. With six people using it in rounds, that is the difference between a sauna that holds temperature and one that never quite recovers. Why thermowood matters here The body is thermowood throughout — timber kiln-treated at 180–220°C in a low-oxygen chamber. That is not a surface coating. It changes the wood itself, closing the cells so it absorbs far less moisture, which is what stops outdoor timber cupping, twisting and splitting through a British winter. No chemical preservatives are involved, and it weathers to a stable silver-brown rather than going grey and rough. On a building this size with a projecting terrace roof, dimensional stability is not a luxury. There is a great deal more timber here than on a compact cabin, and proportionally more to gain from wood that does not move. Specification Capacity 6 people in the hot room External size 4050 mm L × 3000 mm W × 2480 mm H Layout Hot room, changing room and covered terrace Heated volume approx. 9 m³ (total shell approx. 19 m³) Side walls 42 mm thermowood Rear wall 28 mm thermowood Front window Ø 900 mm round Door Solid timber with three round porthole windows, 1920 × 690 mm Benches Thermo-aspen — stays cool to the touch at temperature Roof Bitumen shingles — black, red, green or brown Bands Stainless steel Weight approx. 1700 kg What's in the box Everything structural. No hidden extras to buy before you can build it: Thermowood shell panels, pre-cut and numbered Thermo-aspen benches Porthole timber door and Ø 900 mm round front window Covered terrace structure, decking and integrated log store Bitumen roof shingles in your chosen colour Floor and foundation beams Stainless steel bands and complete fixing kit Fascia boards and ventilation grids Step-by-step assembly instructions Run it on gas — no electrician, no cable across the garden This is the option almost nobody else offers, and for a lot of gardens it is the one that makes a sauna possible at all. A FinSteam gas heater runs on a standard propane bottle — the same sort you would use for a patio heater or a barbecue. No armoured cable, no trench across the lawn, no electrician quote you had not budgeted for. If your garden has no power at the far end, this is how you still get a sauna there. The partition is what makes gas viable at this size. At around 9 m³ the heated room is at the top of what a single 8.1 kW heater serves well — which is exactly why the Kaari 300 is the largest oval we offer it on. Anything bigger and we would be overselling it. Pick a gas option above and we fit the flue and commission the heater on installation day. You do not need to arrange anything with anyone. Which gas option? Botnia 81 Our standard 8.1 kW gas heater. Everything you need to run the sauna. Aurora 81 The premium version of the same 8.1 kW heater — better finish and detailing. And then: safety pack, or without? With safety packrecommended on a sauna this size Adds the Njord heat shield and the Halo guard rail. The heat shield cuts the required clearance to combustible timber from 200 mm to 50 mm. The guard rail stops anyone brushing against the hot stones — worth having when six people are moving around a room. Without safety pack Heater and stone cage only. Suits an install where clearance is generous and the sauna is for your own use. Every gas option includes the heater, the Orbis stone cage, and our fitting and commissioning. See the full gas heater range → Or choose electric or wood-fired above Electric — a Harvia floor-standing heater with a full stone load for soft, steady löyly, integrated controls and a 2-year warranty. At 9 m³ you want the 8 kW; check your supply can carry it. Needs a dedicated circuit installed by a qualified electrician, so budget £400–£1,200 for a garden supply on top of the heater. Wood-fired — a Harvia M-series stove. No electrics at all, a real fire, and arguably
Product information updated: 19 Sep 2026
Disclaimer: Product information, including title, description, and images, is sourced/provided by our affiliate partner: Steam & Oak.
Disclaimer: Some of the links on this website are affiliate links, meaning we may earn a commission if you click through and make a purchase. This comes at no additional cost to you.
By clicking the button above, you acknowledge that you will be redirected to a third-party website and agree to their terms and conditions.
Product information, including title, description, and images, is sourced/provided by our affiliate partner: Steam & Oak.
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Share this product with a friend:
Refer a friend and earn 0.05 CEC when they click the link, plus an additional 1.00 CEC if they register. Share this Product and boost your earnings together!