Product Benefits

The Cozy Heat Thru-Wall is the same wood burning sauna stove as the standard model, mounted so the firebox door opens into the next room. You load wood, poke the fire and empty the ash from outside the sauna, and none of the bark, splinters or smoke ends up on the benches. The stone cage of angular diamond expanded mesh stays in the hot room where it belongs. The COZYTW12 heats a home sauna room of 210 to 423 cu ft and the COZYTW18 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.

Wood fired saunas have one recurring annoyance and it is not the heat. It is the wood. Bark on the floor, ash when you open the door, a cold draught every time you refuel. Feeding from the other side of the wall removes all three, and costs nothing in stone: 243 lb on the COZYTW12, 353 lb on the COZYTW18.

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 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 COZYTW18 runs at 81.3% overall efficiency with a flue gas temperature of 234 °C / 453 °F. The COZYTW12 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 24.4 to 26.0 in on the COZYTW12 and 28.7 to 30.5 in on the COZYTW18. 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 COZYTW12 and 52.8 in above the COZYTW18. Nothing is hardwired. Empty the ash box each session and restack the stones once per year.

• The Promise

• Why Buy This From GooFitness

• Financing through Affirm, Brickhouse, Reliant and Acorn.

Specifications

• Cozy Heat COZYTW12 and COZYTW18: the fire is inside, the mess is not

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

Ideal For

Sauna rooms built against a concrete or brick wall with a changing room or plant room behind.

Owners who run long sessions and need to feed the fire without opening the sauna door.

Commercial or shared saunas where guests should never touch the fire.

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.

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

Benefits and Features

Benefits and the feature behind each one

What you get

The feature behind it

No wood, bark or ash inside the sauna

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

Same steam as the standard model

243 lb of stone on the COZYTW12 and 353 lb on the COZYTW18

The firebox is out of reach of anyone in the sauna

Door, handle and ash box are all on the far side of the wall. The stone cage and flue pipe inside the room still get hot

Less wood per session

Three stage air feed burns the flue gases as well as the wood. 81.3% efficiency on the COZYTW18

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

COZYTW12 or COZYTW18

Specifications by model

Sp

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 185 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

What's the benefit of the thru-wall feed? You load wood, poke the fire, and empty the ash from outside the sauna, so none of the bark, splinters, or smoke ends up on the benches.

Does the thru-wall version lose any stone capacity? No, it holds the same amount as the standard model: 243 lb on the COZYTW12 and 353 lb on the COZYTW18.

What wall does it require? It installs into an opening in a concrete or brick wall — a standard timber stud wall will not do — with a maximum wall thickness of 5.9 in and the opening at least 17.3 in above the floor.

What room size does it heat? The COZYTW12 heats 210 to 423 cubic feet and the COZYTW18 covers 317 to 635 cubic feet.

Is it certified for use in North America? No, it carries no UL, ETL, or CSA listing — only CE marking and EN 15821:2010 testing — so check with your local building department and insurer first.

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