Product Benefits

The Cozy Heat O Thru-Wall puts the round stone cage in the sauna and the firebox door in the room behind it. You feed wood and clear ash without stepping into the heat, and the cylindrical cage keeps every stone the same distance from the fire so the steam stays even. The COZYOTW12 heats a home sauna room of 210 to 423 cu ft and the COZYOTW18 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.

Two problems solved at once. Compared against an angular cage, the round one has no cold corners where the outer rock never heats. The wall mount then deals with the wood, the bark and the ash. Neither costs the owner any stone: 243 lb on the COZYOTW12, 353 lb on the COZYOTW18.

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 O 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 COZYOTW18 runs at 81.3% overall efficiency with a flue gas temperature of 234 °C / 453 °F. The COZYOTW12 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 24.8 to 26.4 in on the COZYOTW12 and 28.9 to 30.7 in on the COZYOTW18. 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 COZYOTW12 and 52.8 in above the COZYOTW18. Nothing is hardwired. Empty the ash box each session and restack the stones once per year.

• Cozy Heat O COZYOTW12 and COZYOTW18: round cage, fire 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

Small rooms where a round shape reads better and there is a masonry wall behind.

Owners who run long sessions and refuel without opening the sauna door.

Anyone who wants even heat off the rock rather than hot spots.

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 O.

Rooms under 210 cu ft. Even the COZYOTW12 will overheat them.

Benefits and Features

Benefits and the feature behind each one

What you get

The feature behind it

Even heat off every stone

Round cage keeps all 243 lb on the COZYOTW12 the same distance from the firebox

No wood, bark or ash inside the sauna

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

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 COZYOTW18

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

COZYOTW12 or COZYOTW18

Specifications by model

Spec

COZYOTW12

COZYOTW18

Output

12 kW

18 kW

Room volume

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 181 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

Why a round cage instead of an angular one? A round cage has no cold corners where outer rock never fully heats, so every stone works evenly.

How much stone does it hold? The COZYOTW12 holds 243 lb and the COZYOTW18 holds 353 lb.

How does the thru-wall feed work? The firebox door opens into the room behind the sauna wall, through an opening at least 10.0 in wide and at least 17.3 in above the floor, in a wall no more than 5.9 in thick.

What room size does it heat? The COZYOTW12 heats 210 to 423 cubic feet and the COZYOTW18 covers 317 to 635 cubic feet.

What's the lead time? 60 days from Estonia, shipped by LTL freight.

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