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Home / Products / Cozy Heat O Thru-Wall Sauna Stove Wood-Burning Sauna Stove, Up to 18kW
A cylindrical sauna heater filled to the top with grey, rounded stones. A black diamond-patterned wire mesh cage forms the outer body, holding the rocks in place. At the front base is a black metal door with a rectangular glass window looking into an empty firebox. Above the glass, the word "COZY" is cut into the metal, flanked by vertical vents and a small silver knob. The entire unit sits on a white background.
A cylindrical sauna heater filled with grey, rounded stones inside a black diamond-mesh wire cage. At the front base is a black metal door featuring a glass window. Inside the firebox, orange and yellow flames burn brightly over a piece of firewood. Above the window, the brand name "COZY" is cut into the metal, flanked by small vertical vents and a silver knob. The entire unit is set against a plain white background.
A wood-burning sauna stove is shown in operation inside a dimly lit wooden sauna room. The black cast-iron firebox door is swung wide open to the right, revealing bright orange and yellow flames actively consuming logs inside the chamber. The open door features a large glass panel through which the wire mesh cage and stacked sauna stones on the side of the unit are partially visible.
An authorized retailer graphic is displayed on a plain white background. At the top, the brand name "COZY" is printed in large, black, serif capital letters, framed between two solid horizontal black lines. Centered below this logo, the phrase "Authorized Retailer" is written in a dark blue, bold serif font.
An empty, cylindrical sauna heater shown from a three-quarter angle against a white backdrop. It features a large, black metal mesh cage designed to hold stones, which is currently completely empty. Inside the mesh, the inner black metal body of the stove is visible. A thick black metal firebox door protrudes from the lower front right, complete with a glass window, a curved vertical handle, and the word "COZY" embossed above the glass pane.
A cylindrical sauna heater filled with light grey, rounded stones, viewed from a side profile angle against a plain white background. The rocks are securely packed inside a black wire mesh cage with a diamond pattern. Protruding from the lower right side is the black metal housing of the firebox door. A curved, vertical handle is visible on the far right edge of the door mechanism.
A close-up view shows the open firebox of a Cozy Heat wood-burning sauna stove. The black cast-iron door is swung open to the right side, revealing several large, split pieces of dry firewood neatly stacked inside the dark chamber. Directly above the main opening, the matte black frame features 3 small, circular air vents arranged horizontally, secured w/ two screws. In the background, just above the firebox structure, the wire mesh cage & stacked grey sauna stones are partially visible.
A cylindrical sauna heater filled to the top with grey, rounded stones. A black diamond-patterned wire mesh cage forms the outer body, holding the rocks in place. At the front base is a black metal door with a rectangular glass window looking into an empty firebox. Above the glass, the word "COZY" is cut into the metal, flanked by vertical vents and a small silver knob. The entire unit sits on a white background.
A cylindrical sauna heater filled with grey, rounded stones inside a black diamond-mesh wire cage. At the front base is a black metal door featuring a glass window. Inside the firebox, orange and yellow flames burn brightly over a piece of firewood. Above the window, the brand name "COZY" is cut into the metal, flanked by small vertical vents and a silver knob. The entire unit is set against a plain white background.
A wood-burning sauna stove is shown in operation inside a dimly lit wooden sauna room. The black cast-iron firebox door is swung wide open to the right, revealing bright orange and yellow flames actively consuming logs inside the chamber. The open door features a large glass panel through which the wire mesh cage and stacked sauna stones on the side of the unit are partially visible.
An authorized retailer graphic is displayed on a plain white background. At the top, the brand name "COZY" is printed in large, black, serif capital letters, framed between two solid horizontal black lines. Centered below this logo, the phrase "Authorized Retailer" is written in a dark blue, bold serif font.
An empty, cylindrical sauna heater shown from a three-quarter angle against a white backdrop. It features a large, black metal mesh cage designed to hold stones, which is currently completely empty. Inside the mesh, the inner black metal body of the stove is visible. A thick black metal firebox door protrudes from the lower front right, complete with a glass window, a curved vertical handle, and the word "COZY" embossed above the glass pane.
A cylindrical sauna heater filled with light grey, rounded stones, viewed from a side profile angle against a plain white background. The rocks are securely packed inside a black wire mesh cage with a diamond pattern. Protruding from the lower right side is the black metal housing of the firebox door. A curved, vertical handle is visible on the far right edge of the door mechanism.
A close-up view shows the open firebox of a Cozy Heat wood-burning sauna stove. The black cast-iron door is swung open to the right side, revealing several large, split pieces of dry firewood neatly stacked inside the dark chamber. Directly above the main opening, the matte black frame features 3 small, circular air vents arranged horizontally, secured w/ two screws. In the background, just above the firebox structure, the wire mesh cage & stacked grey sauna stones are partially visible.

Cozy Heat

COZY O TW 12

Cozy Heat O Thru-Wall Sauna Stove Wood-Burning Sauna Stove, Up to 18kW

$2,182.50 - $2,416.85$2,425.00 - $2,685.39
Kilowatt

Estimated to ship:

Call or text anytime 1-844-HYDRO-33 (1-844-493-7633)

LOWEST PRICE GUARANTEE

The Cozy Heat O TW is a through-the-wall wood-burning sauna stove that lets you load firewood from outside your sauna room! Hand-made in Estonia, where sauna is a way of life, this wood-fired sauna stoves is engineered for mild, long-lasting heat. Pouring water over hot stones creates intense steam to further enhance your sauna experience. 

  • 12kW - For sauna rooms from 210 to 423 cubic feet
  • 18kW - For sauna rooms from 317 to 635 cubic feet

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.

FEATURES

  • 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
  • Stone requirements:
    • 12kW - Minimum of 200 lbs of stones
    • 18kW - Minimum of 350 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

INCLUDES

  • Outer frame of the heater
  • Chimney pipe 
  • Heater body
  • Cleaning hatch
  • Heater door with glass
  • Ash box
  • Installation and operation manual
  • 2-Year Warranty
Model COZY O-TW 12
Kilowatt Rating 12kW
Primary Fuel Wood
Maximum Firewood Length 13" (33 cm)
Diameter of Firewood 4.7" - 5.9" (12-15 cm)
Minimum Cubic Feet 210 Cu. Ft.
Maximum Cubic Feet 423 Cu. Ft.
Minimum Room Height 72" (182.9 cm)
Flue Connection Location Top
Safety Distance See Installation and Operation Manual
Stove Dimensions 17.7"W (45 cm) x 26.4"D (67.1 cm) x 27.6"H (70 cm)
Stove Weight 125 lbs (56.7 kg)
Shipping Weight with Sauna Stones 345 lbs (156.5 kg)
Model COZY O-TW 18
Kilowatt Rating 18kW
Primary Fuel Wood
Maximum Firewood Length 15.7" (40 cm)
Diameter of Firewood 4.7" - 5.9" (12-15 cm)
Minimum Cubic Feet 317 Cu. Ft.
Maximum Cubic Feet 635 Cu. Ft.
Minimum Room Height 82" (208.3 cm)
Flue Connection Location Top
Safety Distance See Installation and Operation Manual
Stove Dimensions 19.9"W (50.6 cm) x 31"D (78.8 cm) x 29.8"H (75.6 cm)
Stove Weight 181 lbs (82.1 kg)
Shipping Weight with Sauna Stones 533 lbs (241.8 kg)

WHY YOU SHOULD BUY WITH US

Personalized Attention: As a small business we can provide individualized service that the big box stores just can't offer.

We Price Match: We offer the best prices online, but if you find lower, call or email us for a price match discount!

Authorized Retailer: We are an authorized retailer for all our brands. Manufacturer's warranties fully apply when you buy with us.

No Sales Tax: Take advantage of no sales tax when you buy with us and save big compared to national chains.

Secure Checkout: Whether ordering by phone or online, your information is always secure.

Fast and Free Shipping: Even the largest products arrive quickly. Final delivery for freight items will be scheduled with you by the carrier at a time of your choosing.
Free Shipping is to the lower 48 contiguous states. Please contact us for a quote to Alaska, Hawaii, or Puerto Rico.

Easy Returns: We help you get it shipped back. Click here for our full return policy.

Our Promise: We promise to treat you right! As a small family owned business, our goal is to treat you in the same manner we'd want our family members to be treated. Let us know how we can be of service! If something goes wrong, you can always ask to speak to a manager.

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