Cozy Heat O Thru-Wall Sauna Stove - The Rich Nest

Ships in 5–7 business days. Delivery times may vary slightly depending on your location and carrier availability.

Ships in 5–7 business days. Delivery times may vary slightly depending on your location and carrier availability.

Cozy Heat O Thru-Wall Sauna Stove

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Cozy Heat has taken the time-honored craft of building sauna stoves to a higher level. The part of the wood-burning heater that must be the strongest, the flame cutter, is made of sturdy, 5mm-thick stainless steel making COZY heaters extremely durable. 

This wood-fired sauna stove is hand-made in Estonia, where sauna bathing is a national tradition.

Perfect for mild, long-lasting heat, the O TW is designed for pouring water over hot stones to create intense and luxurious steam for a more gratifying sauna experience.

The Cozy Heat O TW wood-burning sauna stove features a through-the-wall design that lets you load firewood from outside your sauna. At the heart of the Cozy Heat O TW is its innovative circular rim design, which not only enhances the heater's aesthetic appeal, but also ensures efficient heat distribution throughout your sauna space.

Model: Cozy O Thru-Wall 12

Kilowatt Rating: 12kW

Primary Fuel: Wood

Maximum Firewood Length: 12.99" (329mm)

Diameter of Firewood: 3.14" to 4.72" (80mm–120mm)

Minimum Cubic Feet: 210 cu. ft.

Maximum Cubic Feet: 423 cu. ft.

Minimum Room Height: 72" (1828mm)

Flue Connection Location: Top

Heater Weight: 125 lbs

Shipping Weight with Sauna Stones: 367 lbs

Safety Distance Front to Back: 55.1" (1400mm)

Safety Distance Left to Right: 33.06" (840mm)

Stove Depth: 26.37" (670mm)

Stove Width: 17.71" (450mm)

Stove Height: 27.55" (700mm)


Model: Cozy O Thru-Wall 18

Kilowatt Rating: 18kW

Primary Fuel: Wood

Maximum Firewood Length: 15.74" (400mm)

Diameter of Firewood: 3.14" to 4.72" (80mm–120mm)

Minimum Cubic Feet: 317 cu. ft.

Maximum Cubic Feet: 635 cu. ft.

Minimum Room Height: 82" (2096mm)

Flue Connection Location: Top

Heater Weight: 181 lbs

Shipping Weight with Sauna Stones: 533 lbs

Safety Distance Front to Back: 59.43" (1510mm)

Safety Distance Left to Right: 39.75" (1010mm)

Stove Depth: 30.70" (780mm)

Stove Width: 19.88" (505mm)

Stove Height: 29.76" (756mm)

Wood-burning

Steel Construction

Smoke gases are 6x cleaner

German BIMSCH certificate

Stove utilizes 25%–40% less fuel than comparable sauna stoves

Boasts minimal safety distances

Mild and long-lasting heat

Floor mount thru-wall

Sauna Room Sizes:

12kW – 210 to 423 cu.ft.

18kW – 317 to 635 cu.ft.

Stone Requirements:

12kW – Minimum of 265 lbs of stones

18kW – Minimum of 353 lbs of stones

Please note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function.

(Additional freight charges will apply.)

2-Year Warranty

Designed and engineered in Estonia

  • Outer frame of the heater
  • Chimney pipe 
  • Heater body
  • Cleaning hatch
  • Heater door with glass
  • Ash box
  • Installation and operation manual
  • 2-Year Warranty

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