Product Benefits

The Cozy Heat SW Thru-Wall carries more rock than anything else Cozy Heat makes and puts the firebox door in the room behind the sauna. The COZYSWTW18 holds 397 lb of stone against 353 lb on every other 18 kW in the range, inside a barrel cage of vertical flat steel staves. The COZYSWTW12 heats a home sauna room of 210 to 423 cu ft and the COZYSWTW18 covers 317 to 635 cu ft. Both are wood burning sauna heaters that install through a masonry wall with no power and no wiring, and the only routine jobs are emptying the ash box and restacking the stones once per year. Stones and chimney are used with the stove and both are sold separately.

Steam volume comes from hot rock, and this is the most hot rock Cozy Heat will sell you. Any owner who has run a shallow rock tray knows the difference. 397 lb on the 18 kW, reached by going up rather than out, so it costs 2.0 in of width instead of a bench. Then the firebox moves through the wall.

The Thru-Wall models install into an opening in a concrete or brick wall. A standard timber stud wall will not do. Maximum wall thickness is 5.9 in, the opening must be at least 10.0 in wide, and the bottom of the opening must sit at least 17.3 in above the floor. Measure before you order. These stoves are CE marked under Construction Products Regulation 305/2011 EU and tested to EN 15821:2010 by TUV SUD, notified body 0036, but there is no UL, ETL or CSA listing, so confirm with your building department and your insurer. Lead time is 60 days from Estonia on LTL freight. If either the wall or the permit is a problem, buy the Cozy Heat SW and load it from inside the room.

You can find a cheaper wood sauna stove. You cannot buy this one cheaper: Cozy Heat sets the price and every dealer holds it. What changes is what comes with the order.

The specs back that up. The COZYSWTW18 runs at 81.3% overall efficiency with a flue gas temperature of 234 °C / 453 °F. The COZYSWTW12 runs at 73.9%. Dust emission is 22 mg/m³ and 35 mg/m³. Both burn wood logs only, up to 30 cm / 11.8 in, loaded on the grate at the back of the chamber rather than in the extension. Both are black steel with a 114 mm / 4.49 in flue that exits from the top.

The wall decides this one, and the numbers are in the callout above. The extension pushes the stove depth to 25.6 to 27.2 in on the COZYSWTW12 and 28.7 to 31.5 in on the COZYSWTW18. Inside the sauna, clearances match the standard model: 6.7 in to the sides on the 12 kW and 9.1 in on the 18 kW, with 44.5 in of headroom above the COZYSWTW12 and 52.8 in above the COZYSWTW18. Nothing is hardwired. Empty the ash box each session and restack the stones once per year.

• Cozy Heat SW COZYSWTW12 and COZYSWTW18: most stone in the range, fed from next door

• The Promise

• Why Buy This From GooFitness

• Financing through Affirm, Brickhouse, Reliant and Acorn.

Specifications

• IMPORTANT: THE WALL HAS TO BE MASONRY, AND NO MORE THAN 5.9 IN THICK

Ideal For

Buyers whose first priority is steam volume, with a masonry wall behind the sauna.

Rooms with normal or high ceilings.

Long session bathers who refuel without opening the sauna door.

Not Ideal For

Anyone whose inspector or insurer requires a UL, ETL or CSA listed appliance.

Timber stud walls. The opening has to be concrete or brick, 5.9 in thick at most.

Low ceilings. The COZYSWTW18 needs about 7 ft 3 in of headroom once you add the clearance.

Freestanding saunas with no adjacent room. Buy the standard Cozy Heat SW.

Benefits and Features

Benefits and the feature behind each one

What you get

The feature behind it

The most steam of any Cozy Heat

397 lb of stone on the COZYSWTW18, 44 lb more than any other 18 kW in the range

Extra mass without extra floor

Height goes to 32.1 in on the 12 kW while width stays at 19.3 in

No wood, bark or ash inside the sauna

Fire chamber extension passes through the wall so the door opens in the next room

Less wood per session

Three stage air feed burns the flue gases as well as the wood. 81.3% efficiency on the COZYSWTW18

The hottest part is the part they overbuilt

Flame cutter in 5 mm stainless steel, the component that takes the most heat

Swipe the table sideways

COZYSWTW12 or COZYSWTW18

Specifications by model

Spec

COZYSWTW12

COZYSWTW18

Output

12 kW

18 kW

Room volume

210 to 423 cu ft

317

Shipping & Delivery

We check the wall first. Thickness, opening size and height off the floor, before the order goes in. On a 60 day lead time from Estonia that call is the one that saves the order.

White glove delivery is available as a paid add-on. The crew brings it into the room you want instead of leaving 236 lb of stove at the curb.

Multi-unit pricing, consolidated freight, and a person on the contact us at support@goofitness.com.

Warranty

✓ GooFitness is an authorized Cozy Heat dealer. Orders include the factory warranty and direct manufacturer support.

Authorized dealer, so the 24 month factory warranty is valid and Cozy Heat supports the stove directly.

Frequently Asked Questions

How much stone does the SW Thru-Wall carry? The COZYSWTW18 holds 397 lb of stone, versus 353 lb on every other 18kW Cozy Heat stove.

What are the wall opening requirements? The wall opening needs a maximum thickness of 5.9 in, must be at least 10.0 in wide, and the bottom must sit at least 17.3 in above the floor.

What room size does it heat? The COZYSWTW12 heats 210 to 423 cubic feet and the COZYSWTW18 covers 317 to 635 cubic feet.

How efficient is it? The 18kW model runs at 81.3% overall efficiency with a flue gas temperature of 234°C/453°F, while the 12kW runs at 73.9%.

How long is the lead time? Lead time is 60 days from Estonia, shipped by LTL freight.

Questions? Contact us at support@goofitness.com or visit goofitness.com.