SOZEN SAUNAS,
Canadian red or yellow cedar inside. Thermo-mahogany outside, heat-treated in a vacuum kiln. The only saunas in Indonesia made this way.
Two specialists.
One place for hot and cold.
Sozen builds the saunas, Kaido the ice baths: two specialists, each focused on its own craft, stronger for working together.
As Sozen’s exclusive retail partner in Bali, Kaido brings you both, looking after you from the first visit to the care plan.
The top grade,
from Canada.
- Inside
- Canadian red or yellow cedar, clear grade, the top grade: no knots, untreated and fully natural. Red cedar has a rich, warm scent, the one you would expect inside a Canadian lodge; yellow cedar a softer, earthier one
- Outside
- Thermo-mahogany, clear grade: a harder-wearing wood, heat-treated at 180–200°C in a vacuum kiln, no chemicals
- Worth it
- On average, clear red cedar is twice the price of knotty red cedar, the lower grade: $8–12 a square foot, against $4–6
- Walls
- 40 mm, on a galvanised steel frame
- Heater
- Harvia, from Finland, sized to the room
Cedar against
sungkai.
Sungkai is what many saunas in Indonesia use inside. Each figure is on average, for dried wood and a 40 mm wall.
| Red cedar | Yellow cedar | Sungkai | |
|---|---|---|---|
| WeightLighter wood has more air in it: cooler to sit on, and it warms up sooner | 380 kg/m³: 41% lighter than sungkai | 490 kg/m³: 23% lighter | 640 kg/m³ |
| Heat lost through the wallsLess heat lost: the room warms sooner and the heater works less | 40% less than sungkai | 21% less than sungkai | The most |
| Wood to warm upIn each m² of wall | 15 kg | 20 kg | 26 kg |
| Durability classHow long the wood lasts above the ground, out in the weather. Class 1 is the top | Class 2, durable: 15–40 years | Class 1, very durable: over 40 years | Moderately durable (class 3 of Indonesia’s 5) |
| Treated | Not at all: fully natural | Not at all: fully natural | Usually, for damp |
Heats sooner
On average, 15 kg of red cedar or 20 kg of yellow in each m² of wall, against 26 kg of sungkai.
Costs less to run
The walls keep more heat in, so the heater works less.
Lasts longer
Yellow cedar is in the top durability class, red cedar in the next. Sungkai is rated only moderately durable.
Now the outside:
two finishes.
You have chosen the wood inside. For the outside, choose the finish. Both are real wood, the same hard-wearing mahogany underneath.
Charcoal black
The outside scorched black, the grain still in it.
Red mahogany
A warm reddish brown that keeps the look of the wood.
Either finish goes with either cedar inside. Next: why the outside wood is different, and how it is made.
The only saunas in Indonesia
made this way.
The outside takes the rain and the sun, so it is not cedar: it is clear-grade mahogany, a harder-wearing wood, made this way. Most makers dry wood in a normal kiln: hot air at 38–82°C. The outside of each board dries first, and pockets of water stay inside. That heat is too low to change the wood itself, so in Bali’s damp air it takes the water back: the wet pockets swell more than the rest, the board pulls against itself, and it can split. Sozen dries the mahogany evenly, then heat-treats it at 180–200°C in a vacuum kiln: 98–118°C hotter. At that heat the part of the wood that takes up water breaks down. With no air inside, the wood cannot catch fire; in a hot-air kiln, it would burn. The cedar inside needs none of it: it is left fully natural. Sozen is the only importer of this wood in Indonesia, and the only company here with the machine for this process.
98–118°C hotter
180–200°C, against a normal kiln’s 38–82°C. In a vacuum, so the wood cannot burn.
Stays straight
Less to crack, split or warp in the heat.
Up to half the water
No chemicals: heat-treated wood takes in up to half as much water from damp air.
Three sizes,
or yours.
Each with a Harvia heater and LED lighting, delivered and installed, in two finishes.
Loyly Solo
125 × 135 × 200 cm · 3.5 kW
Rp 140,000,000
Loyly Duo
175 × 150 × 200 cm · 4.5 kW
Rp 160,000,000
Loyly Family
200 × 180 × 200 cm · 5.5–6 kW
Rp 205,000,000
Choose the wood outside
Charcoal black
Clear-grade mahogany, scorched black, the grain still in it.
Red mahogany
Clear-grade mahogany, a warm reddish brown that keeps the look of the wood.
Red or yellow cedar
Clear grade, untreated and fully natural. Red: rich and warm. Yellow: soft and earthy.
And the heat: a Harvia heater from Finland, sized to the room.
What the price covers
- The sauna
- Built to order by Sozen, with its Harvia heater and LED lighting. It carries Sozen’s name.
- Site and power check
- Rp 1,500,000. We check the space and the power the heater needs. It comes off the price when you buy.
- Delivery and install
- By Sozen. Priced for your area, on your quote.
- Ready in
- Usually 60 days from the deposit, and 90 days for a custom design.
- Paying
- 25% starts the build. The rest is due before it ships.
- Warranty
- 1 year, from Sozen
- With an ice bath
- 10% off both
Built for
the space.
This one was designed for a villa terrace, beside the pool. Tell us the space and we’ll design and specify yours: the size, layout, glass, finish and heater.
With a Kaido
ice bath.
A Sozen sauna with a Kaido stainless steel ice bath: 10% off both. We plan them as one space. One care plan looks after both.
Never alone. With a heart condition, high blood pressure or pregnancy, talk to a doctor first.
Find it for less,
we’ll match it.
Find a sauna in Indonesia of the same natural clear-grade Canadian red or yellow cedar and vacuum kiln-dried mahogany, to the same build, for less. Show us the written quote and we’ll match the price.
Sources: Sozen, October 2026, and its product catalogue, January 2026 (the grade, the vacuum kiln and heat treatment of the mahogany, the walls, heaters, sizes and finishes); Queensland Government, Properties of timbers and Durability above-ground (380 kg/m³, class 2, 15–40 years; the classes of Australian Standard AS 5604, class 1 the top); WoodSolutions (yellow cedar 490 kg/m³, over 40 years above ground, class 1); USDA Forest Products Laboratory, Dry kiln schedules for commercial woods, FPL-GTR-57, 1988 (normal kilns 38–82°C); Purdue University, FNR-132 (a normal kiln dries the outside first); the scents, Kaido’s own description; Forests, 2023, and Borneo Science, 2016 (sungkai 640 kg/m³, moderately durable, class III on Indonesia’s own scale of I to V); USDA Wood Handbook, 2021 (how well 40 mm keeps the heat in, worked out on average at 12% moisture); ThermoWood handbook, 2021 (up to half the moisture after heat treatment at 220°C); Tahoe Sauna Company, June 2026 (clear $8–12 and knotty $4–6 a square foot). In full on the science page.
Sozen makes, delivers and installs the saunas on this page; Kaido sells them and looks after you. Prices from 5 November 2026; figures checked on 30 October 2026.