Thermory Square Series Sauna
Thermory Square Series Sauna - No 40/41 · 6-Person / With Window is backordered and will ship as soon as it is back in stock.
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- Model: Square Series — No 40/41 · No 42/43 · No 45
- Sustainably sourced Northern European spruce features a brushed texture, distinct knots, and consistent heartwood color
- Unrivaled rot- and moisture-resistance with exceptional stability and durability
- Superior insulating properties keep you surrounded with even heat distribution
- Intuitively engineered for simple DIY installation
- Three sizes — 1–2, 4, and 6 person — each available with or without a window
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Thermory Square Series Sauna
| No 40/41 · 6-Person | No 42/43 · 4-Person | No 45 · 1–2 Person | |
|---|---|---|---|
| Dimensions (L x W x H) | 99" x 83" x 87" | 83" x 83" x 87" | 55" x 53" x 87" |
| Published Volume | 241 cu ft | 191 cu ft | 98 cu ft |
| Interior Volume (heater-sizing basis) | 294 cu ft | 234 cu ft | 126 cu ft |
| Recommended Heater | 11 kW | 9 kW | 5 kW |
| Back Bench | 6.5 ft x 1.6 ft | 6.5 ft x 1.6 ft | 3.9 ft x 1.7 ft |
| Side Bench | 4.3 ft x 1.6 ft | 2.9 ft x 1.6 ft | 2.0 ft x 0.9 ft |
| Porch Length | 19" | 19" | — (no porch) |
| Window Option | 75" x 38" side window, +$695 | Side window, +$638 | Not offered |
| Product Weight | 1,720 lbs (no window) – 1,820 lbs (with window) | 1,543 lbs (no window) – 1,609 lbs (with window) | 992 lbs |
| Price | $9,212 (no window) / $9,907 (with window) | $8,372 (no window) / $9,010 (with window) | $5,727 |
Dimensions are rounded to the nearest inch for readability. Published Volume is net of benches, per Thermory's spec sheet; Interior Volume is the true wall-to-wall interior the heater-sizing recommendation below is based on, so it runs larger.
- Available in three sizes — 1–2, 4, and 6 person — with the two larger sizes offered with or without an added window.
- Spacious design with over seven feet of headroom and deep, reclining tiered benches.
- Constructed with thermally modified Nordic spruce—rot-resistant for up to 25 years and highly dimensionally stable.
- Smooth-milled, brushed surfaces with consistent color and visible grain that stay comfortable and cool to the touch during use.
- Superior insulation ensures consistent, even heat distribution throughout the interior.
- Full tempered-glass front on every size for light and an open, inviting feel.
- Built-in porch on the No 40/41 and No 42/43 sizes for cooling down between rounds.
- DIY-friendly kit designed for intuitive, self-guided assembly (heater not included).
- Sustainably sourced materials meet expert-level craftsmanship.
- Manuals
- Cradles
- Body staves
- Wall panels
- Wooden trims
- Glass front door with handle
- Front panels with glass
- Interior benches
- Backrest staves
- Duckboard flooring
- Fasteners
- Metal bands
- PVC rain jacket with trim
No 40/41 and No 42/43 also include porch benches. No 40 additionally includes a panoramic window panel and No 42 includes its window — see the comparison table above for what's included on each size.
Heater sizing for this sauna
Sized to the interior volume of the size you have selected, and matched to how the heater mounts.
- Interior volume
- 294.0 cu ft
- Outdoor, cold climate · 50%
- +147.0
- Effective volume
- 441 cu ft
Worked out from this sauna’s published dimensions, wall to wall, with any porch excluded.
Our recommendation
10.6 kW
HUUM HIVE Mini
At 441 cubic feet this is the size we would put in.
Heaters that fit this sauna
-
Recommended
HUUM HIVE Mini
10.6 kW · rated 354.0–566.0 cu ft
Floor-standing · 50 A breaker · 6 AWG
From $4,866
Complete package with UKU Local Black
-
HUUM CLIFF
10.5 kW · rated 353.0–600.0 cu ft
Floor-standing · breaker not published
From $4,341
Complete package with UKU Local Black
-
HUUM STEEL
10.5 kW · rated 353.0–600.0 cu ft
Floor-standing · breaker not published
From $4,253
Complete package with UKU Local Black
-
HUUM DROP
9.0 kW · rated 282.0–530.0 cu ft
Wall-mount · 50 A breaker · 8 AWG
Top of its range
From $3,133
Complete package with UKU Local Black
One heater per series, at the size that suits this sauna — open any of them to see the rest of the range. Sizing is a starting point, not an installation specification: confirm the output, the mounting and the electrical requirement against the heater’s own manual and a licensed electrician before you buy.
- Interior volume
- 234.0 cu ft
- Outdoor, cold climate · 50%
- +117.0
- Effective volume
- 351 cu ft
Worked out from this sauna’s published dimensions, wall to wall, with any porch excluded.
Our recommendation
9.0 kW
HUUM HIVE Mini
At 351 cubic feet this is the size we would put in.
Heaters that fit this sauna
-
Recommended
HUUM HIVE Mini
9.0 kW · rated 283.0–460.0 cu ft
Floor-standing · 50 A breaker · 8 AWG
From $4,519
Complete package with UKU Local Black
-
HUUM CLIFF
9.0 kW · rated 317.0–529.0 cu ft
Floor-standing · breaker not published
From $4,100
Complete package with UKU Local Black
-
HUUM STEEL
9.0 kW · rated 317.0–529.0 cu ft
Floor-standing · breaker not published
From $4,086
Complete package with UKU Local Black
-
HUUM DROP
9.0 kW · rated 282.0–530.0 cu ft
Wall-mount · 50 A breaker · 8 AWG
From $3,133
Complete package with UKU Local Black
One heater per series, at the size that suits this sauna — open any of them to see the rest of the range. Sizing is a starting point, not an installation specification: confirm the output, the mounting and the electrical requirement against the heater’s own manual and a licensed electrician before you buy.
- Interior volume
- 126.0 cu ft
- Outdoor, cold climate · 50%
- +63.0
- Effective volume
- 189 cu ft
Worked out from this sauna’s published dimensions, wall to wall, with any porch excluded.
Our recommendation
6.0 kW
HUUM HIVE Mini
At 189 cubic feet this is the size we would put in.
Heaters that fit this sauna
-
Recommended
HUUM HIVE Mini
6.0 kW · rated 177.0–318.0 cu ft
Floor-standing · 30 A breaker · 10 AWG
From $4,364
Complete package with UKU Local Black
-
HUUM CLIFF
6.0 kW · rated 176.0–353.0 cu ft
Floor-standing · breaker not published
From $3,809
Complete package with UKU Local Black
-
HUUM STEEL
6.0 kW · rated 176.0–353.0 cu ft
Floor-standing · breaker not published
From $3,153
Complete package with UKU Local Black
-
HUUM DROP
6.0 kW · rated 177.0–353.0 cu ft
Wall-mount · 30 A breaker · 10 AWG
From $2,888
Complete package with UKU Local Black
One heater per series, at the size that suits this sauna — open any of them to see the rest of the range. Sizing is a starting point, not an installation specification: confirm the output, the mounting and the electrical requirement against the heater’s own manual and a licensed electrician before you buy.
Smart shape. Sweeping views.
Nordic spruce gets a fresh look in a square silhouette with curved contours. Take in the view from the full tempered-glass front of your Thermory Sauna Square while you rest your feet on the tiered bench. Go ahead, stay awhile.
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The most spacious
The height and width of our squares give you seven feet of headroom and deep benches to sit or fully recline.
-
The most durable
Thermally modified Nordic spruce never shrinks for unmatched durability and stability, along with 25 years of proven rot resistance.
-
The most comfortable
Unlike cedar, which can become rough, our Nordic softwood is milled to give you the smoothest surface that’s never too hot.
Take the next step
Thermory Saunas are the only thermally modified saunas in North America. So, you get the beauty of real wood, naturally enhanced with only heat and steam for unequaled durability and stability. And your sauna never shrinks—even in changing weather conditions. Cedar can’t say that.
Sitting porch
Your Thermory Sauna Square’s porch is the perfect place to take breaks between sessions. It’s also a good spot to leave your shoes, your robe, and your troubles.
Tiered bench
When you entertain in your Thermory Sauna Square, there’s never a bad seat in the house. Plus, you can rest your feet on the convenient lower bench.
Extra-wide Window
No matter what’s outside—rain, snow, or jealous neighbors—enjoy the view through your Thermory Sauna Square’s dramatic, rectangular window.
