Product Benefits

The Cozy Heat OG Thru-Wall keeps the barrel cage of rods and angular blades inside the sauna and moves the firebox door into the room behind. It carries more stone than the base model, 265 lb on the COZYOGTW12 against 243 lb on the standard Thru-Wall, and none of the wood or ash ever reaches the benches. The COZYOGTW12 heats a home sauna room of 210 to 423 cu ft and the COZYOGTW18 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.

If the stove is going to be the only object in the room, it should be worth looking at. The OG cage is built from vertical rods with flat steel blades set over them, so the stone shows through in a pattern. Moving the firebox through the wall removes the one part that is not attractive: the door, the handle, the wood pile and the ash.

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 OG 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 COZYOGTW18 runs at 81.3% overall efficiency with a flue gas temperature of 234 °C / 453 °F. The COZYOGTW12 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 25.8 to 27.4 in on the COZYOGTW12 and 30.1 to 31.7 in on the COZYOGTW18. 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 COZYOGTW12 and 52.8 in above the COZYOGTW18. Nothing is hardwired. Empty the ash box each session and restack the stones once per year.

• Cozy Heat OG COZYOGTW12 and COZYOGTW18: the design cage, 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

Rooms where the stove is the design feature and there is a masonry wall behind it.

Owners who want more stone than the base model without going up to the SW.

Shared saunas where guests should never reach the firebox.

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.

Narrow rooms. At 19.6 in wide on the 12 kW this is the widest Thru-Wall in the range.

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

Benefits and Features

Benefits and the feature behind each one

What you get

The feature behind it

More steam per pour than the base Thru-Wall

265 lb of stone on the COZYOGTW12 against 243 lb on the standard COZYTW12

A stove that finishes the room

Barrel cage of vertical rods with flat angular blades set over them

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 COZYOGTW18

The hottest part is the part they overbuilt

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

Swipe t

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 198 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 OG Thru-Wall carry? The COZYOGTW12 carries 265 lb of stone, versus 243 lb on the standard Thru-Wall model.

What does the cage look like? It's built from vertical rods with flat angular steel blades set over them, so the stone shows through in a pattern.

What are the wall requirements for installation? 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.

What room size does it heat? The COZYOGTW12 heats 210 to 423 cubic feet and the COZYOGTW18 covers 317 to 635 cubic feet.

Is it UL listed? No, it carries no UL, ETL, or CSA listing — only CE marking and EN 15821:2010 testing by TUV SUD — so confirm requirements with your building department and insurer.

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