Barrel Saunas
Jonas Teak.Built for Scottish winters.
The mid-sized Jonas barrel in warm teak-oiled thermowood, installed and photographed through a Scottish snow winter to prove the finish holds up.
Overview
Jonas Teak Barrel Sauna.
The Jonas Teak barrel is the model we photograph most often in the depths of a Scottish winter, because the whole point of a garden sauna is that it works when the weather turns, and honey-toned thermowood photographs beautifully against snow.
It's the mid-size Jonas, larger inside than the S, more compact than the Grand, comfortably seating four to five adults on twin-tier hemlock benches, with the same panoramic glass end wall you get on the flagship.
Exterior is thermally-modified spruce with a saturating Danish teak oil finish. Interior is knot-free western hemlock. Heater is a Harvia 8kW electric, sized precisely to the internal volume for a 25-minute cold-to-soak warm-up.
Key features
What makes it different.
4–5 person capacity
Twin-tier hemlock benches accommodate 4 comfortably or 5 socially.
Teak-oiled thermowood
Kiln-modified spruce with saturating teak oil, warm honey tone that suits traditional Scottish gardens.
Harvia 8kW electric heater
Right-sized for the mid-volume barrel, 25-minute warm-up, quiet running.
Panoramic glass front
Full-height toughened glass end wall and door.
Winter-tested
Every unit is temperature-cycled before dispatch. Thermowood is stable to -30°C.
10-year timber warranty
Structural warranty on the thermowood shell and hemlock interior.
Specification
The numbers behind the object.
- Capacity
- 4–5 adults
- External length
- 2.2 m
- External diameter
- 2.1 m
- Timber (exterior)
- Thermowood spruce, teak-oiled
- Timber (interior)
- Knot-free western hemlock
- Heater
- Harvia electric 8kW
- Heat-up time
- ≈ 25 minutes
- Operating temp
- 80–100 °C
- Power requirement
- 32A single-phase
- Weight (empty)
- ≈ 640 kg
- Warranty
- 10 yr structural
Living with it
How it actually works day to day.
Thermowood is a genuine cold-climate material. The kiln modification process bakes out the moisture and resins that make untreated softwood swell, split and rot, leaving a timber that's dimensionally stable to -30°C and doesn't need annual sealant coats.
In real Scottish winter use, this matters. Owners report zero movement in door frames, no ice-cracking around the glass, and a sauna that reaches soaking temperature in the same 25 minutes at -5°C as it does at +20°C.
Teak oil is a maintenance choice, not a structural requirement. Re-oil every 2 seasons for the warm tone, or leave it and let the timber silver, both are fine. We supply the correct oil at handover and demonstrate application.
Best for
Who typically buys this one.
- Rural and semi-rural properties with real winter weather
- Owners who value the classic warm-timber look over black
- Buyers wanting mid-size (4–5 person) capacity without stretching to a Grand
- Holiday lets and short-stays where the sauna is photographed year-round
Real installations
Jonas Teak in Scottish gardens.
Every photograph on this page is a genuine Signature Garden Rooms installation.
Very well. Kiln modification bakes moisture and resins out of the timber, leaving it dimensionally stable down to -30°C. We temperature-cycle every unit before dispatch and have installs on the Fife coast and in Perthshire that have been through six winters without measurable movement.
Next step
Ready to talk about the Jonas Teak Barrel Sauna?
Tell us your garden, your access, and roughly when you'd like it in. We'll come back with a considered price, honest lead time, and any planning notes for your site.
Fully insured · £5m public liability · Falkirk-based, working across Central Scotland