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Home / Products / Cozy Heat Thru-Wall Sauna Stove Wood-Burning Sauna Stove, Up to 18kW
A Cozy Heat 18kW Thru-Wall wood-burning sauna stove is shown from a front perspective against a plain white background. The stove features a tall, multi-sided octagonal outer cage made of black wire mesh that is filled to the top with grey sauna stones. Integrated at the front base is a black cast-iron firebox door with an elongated frame extension for through-wall installation, featuring an open glass-windowed door with the "COZY" brand name embossed above it.
A Cozy Heat 18kW wood-burning sauna stove is shown from a front perspective against a plain white background. The stove features a multi-sided, octagonal outer cage made of black wire mesh that is filled to the top with grey sauna stones. A black cast-iron firebox door is integrated at the base, featuring a large glass viewing window that reveals stacked pieces of firewood inside the chamber and the "COZY" brand name visible just above the wood.
A close-up shows the front door of a Cozy Heat Thru-Wall wood-burning sauna stove installed through a textured wall. The matte black cast-iron door is framed by a matching metal trim and features a vertical handle on the left. Through its glass viewing window, bright orange flames are visible actively burning wood inside the chamber beneath the embossed "COZY" brand name.
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.
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 Cozy Heat Thru-Wall wood-burning sauna stove is shown integrated into a modern sauna structure. On the lower left, the black cast-iron firebox door is built into a textured, grey concrete-style accent wall, with a fire actively burning inside the glass window. To the right, the open doorway reveals the warm wooden interior of the sauna, featuring multi-tiered benches, wood flooring, and large glass windows that provide an expansive view of a surrounding pine forest.
A Cozy Heat 18kW Thru-Wall wood-burning sauna stove is shown from a side perspective against a plain white background. The left portion of the unit features the tall, octagonal black wire mesh cage packed to the top with grey sauna stones. Extending horizontally to the right is the structural firebox tunnel designed for through-wall installation, ending with the open frame of the black cast-iron door that features the embossed "COZY" brand name.
A multi-tiered Cozy Heat Thru-Wall wood-burning sauna stove is shown against a white background. The lower tier features an octagonal black wire mesh cage filled with grey stones, which extends forward into a tunnel for through-wall installation with an open door frame. Stacked on top is a smaller cylindrical mesh cage, also packed with grey stones, with a matte black exhaust pipe extending vertically from the center.
This multi-tiered Cozy Heat Thru-Wall wood-burning sauna stove is viewed from an alternate angle on a plain white background. The lower octagonal black wire mesh cage holds grey sauna stones and extends forward into a firebox tunnel for through-wall installation. The black cast-iron door with a glass window is swung wide open. Atop the main unit sits a smaller cylindrical mesh cage packed with stones and a matte black vertical exhaust pipe.
A Cozy Heat Thru-Wall wood-burning sauna stove is shown from an angled perspective against a plain white background. The unit features a tall, octagonal black wire mesh cage packed to the top with grey sauna stones. Extending forward to the left is the structural firebox tunnel designed for through-wall installation, ending with a black cast-iron door. The door includes a closed glass viewing window, a handle on the left side, and the embossed "COZY" brand name above the glass.
A Cozy Heat Thru-Wall wood-burning sauna stove is shown from a front perspective against a plain white background. The stove features a tall, octagonal black wire mesh cage packed to the top with textured grey sauna stones. At the front base, the structural firebox tunnel designed for through-wall installation is visible, featuring a black cast-iron frame with its glass-windowed door swung wide open to the right to reveal the dark interior chamber.
A Cozy Heat Thru-Wall wood-burning sauna stove is shown from a direct front perspective against a plain white background. The stove features a tall, octagonal black wire mesh cage packed tightly to the top with textured grey sauna stones. At the front base, the unit includes an integrated black cast-iron firebox frame extension designed for through-wall installation, featuring an open glass-windowed door with the "COZY" brand name embossed clearly across the top of the opening.
A Cozy Heat Thru-Wall wood-burning sauna stove is shown from an angled perspective against a plain white background. The unit features a tall, octagonal black wire mesh cage packed to the top with grey sauna stones. Extending forward to the right is the structural firebox tunnel designed for through-wall installation, ending with a closed black cast-iron door. Bright orange flames are visible actively burning inside the glass window beneath the embossed "COZY" brand name.
A Cozy Heat Thru-Wall wood-burning sauna stove is shown from an angled perspective against a plain white background. The unit features a tall, octagonal black wire mesh cage packed to the top with grey sauna stones. Extending forward to the left is the structural firebox tunnel designed for through-wall installation, ending with a closed black cast-iron door. Bright orange flames are visible actively burning inside the glass viewing window beneath the embossed "COZY" brand name.
A Cozy Heat 18kW Thru-Wall wood-burning sauna stove is shown from a front perspective against a plain white background. The stove features a tall, multi-sided octagonal outer cage made of black wire mesh that is filled to the top with grey sauna stones. Integrated at the front base is a black cast-iron firebox door with an elongated frame extension for through-wall installation, featuring an open glass-windowed door with the "COZY" brand name embossed above it.
A Cozy Heat 18kW wood-burning sauna stove is shown from a front perspective against a plain white background. The stove features a multi-sided, octagonal outer cage made of black wire mesh that is filled to the top with grey sauna stones. A black cast-iron firebox door is integrated at the base, featuring a large glass viewing window that reveals stacked pieces of firewood inside the chamber and the "COZY" brand name visible just above the wood.
A close-up shows the front door of a Cozy Heat Thru-Wall wood-burning sauna stove installed through a textured wall. The matte black cast-iron door is framed by a matching metal trim and features a vertical handle on the left. Through its glass viewing window, bright orange flames are visible actively burning wood inside the chamber beneath the embossed "COZY" brand name.
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.
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 Cozy Heat Thru-Wall wood-burning sauna stove is shown integrated into a modern sauna structure. On the lower left, the black cast-iron firebox door is built into a textured, grey concrete-style accent wall, with a fire actively burning inside the glass window. To the right, the open doorway reveals the warm wooden interior of the sauna, featuring multi-tiered benches, wood flooring, and large glass windows that provide an expansive view of a surrounding pine forest.
A Cozy Heat 18kW Thru-Wall wood-burning sauna stove is shown from a side perspective against a plain white background. The left portion of the unit features the tall, octagonal black wire mesh cage packed to the top with grey sauna stones. Extending horizontally to the right is the structural firebox tunnel designed for through-wall installation, ending with the open frame of the black cast-iron door that features the embossed "COZY" brand name.
A multi-tiered Cozy Heat Thru-Wall wood-burning sauna stove is shown against a white background. The lower tier features an octagonal black wire mesh cage filled with grey stones, which extends forward into a tunnel for through-wall installation with an open door frame. Stacked on top is a smaller cylindrical mesh cage, also packed with grey stones, with a matte black exhaust pipe extending vertically from the center.
This multi-tiered Cozy Heat Thru-Wall wood-burning sauna stove is viewed from an alternate angle on a plain white background. The lower octagonal black wire mesh cage holds grey sauna stones and extends forward into a firebox tunnel for through-wall installation. The black cast-iron door with a glass window is swung wide open. Atop the main unit sits a smaller cylindrical mesh cage packed with stones and a matte black vertical exhaust pipe.
A Cozy Heat Thru-Wall wood-burning sauna stove is shown from an angled perspective against a plain white background. The unit features a tall, octagonal black wire mesh cage packed to the top with grey sauna stones. Extending forward to the left is the structural firebox tunnel designed for through-wall installation, ending with a black cast-iron door. The door includes a closed glass viewing window, a handle on the left side, and the embossed "COZY" brand name above the glass.
A Cozy Heat Thru-Wall wood-burning sauna stove is shown from a front perspective against a plain white background. The stove features a tall, octagonal black wire mesh cage packed to the top with textured grey sauna stones. At the front base, the structural firebox tunnel designed for through-wall installation is visible, featuring a black cast-iron frame with its glass-windowed door swung wide open to the right to reveal the dark interior chamber.
A Cozy Heat Thru-Wall wood-burning sauna stove is shown from a direct front perspective against a plain white background. The stove features a tall, octagonal black wire mesh cage packed tightly to the top with textured grey sauna stones. At the front base, the unit includes an integrated black cast-iron firebox frame extension designed for through-wall installation, featuring an open glass-windowed door with the "COZY" brand name embossed clearly across the top of the opening.
A Cozy Heat Thru-Wall wood-burning sauna stove is shown from an angled perspective against a plain white background. The unit features a tall, octagonal black wire mesh cage packed to the top with grey sauna stones. Extending forward to the right is the structural firebox tunnel designed for through-wall installation, ending with a closed black cast-iron door. Bright orange flames are visible actively burning inside the glass window beneath the embossed "COZY" brand name.
A Cozy Heat Thru-Wall wood-burning sauna stove is shown from an angled perspective against a plain white background. The unit features a tall, octagonal black wire mesh cage packed to the top with grey sauna stones. Extending forward to the left is the structural firebox tunnel designed for through-wall installation, ending with a closed black cast-iron door. Bright orange flames are visible actively burning inside the glass viewing window beneath the embossed "COZY" brand name.

Cozy Heat

COZY TW 12

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

$3,719.00 - $4,186.00$4,132.00 - $4,652.00
Kilowatt

Estimated to ship:

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

LOWEST PRICE GUARANTEE

This unique through-the-wall traditional wood-burning stove is hand-made in Estonia is perfect for intimate sauna spaces. Wood-fired stoves are ideal for mild and long-lasting heat, designed for pouring water over hot stones to create luxurious steam for a more satisfying sauna experience. Stoke wood from outside the sauna to keep everything tidy! Enjoy the rustic charm and efficient steam of the Cozy Heat TW sauna heater.

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

COZY has taken the craft of building a wood-fired sauna stove to the next level with this though-the-wall wood-burning sauna stove. Hand-made in Estonia - where sauna bathing is a cherished way of life - this wood stove is perfect for intimate sauna spaces. 

Wood-burning saunas are best for mild and long-lasting heat, designed for pouring water over hot stones to create the perfect amount of steam. Its through-the-wall design allows you to feed firewood into the stove from outside your sauna room.

The most sensitive part of the wood-burning heater, the flame cutter, is made of 5mm-thick stainless steel making COZY heaters extremely durable. 

Cozy wood-fired sauna stoves are engineered for maximum efficiency and environmental sustainability. These stoves achieve exceptional combustion efficiency resulting in lower emissions and reduced firewood consumption of 25-40%, which has earned all Cozy sauna stoves Germany’s highest certification standard, EN 15821:2010, BlmSchV DIN EN 13240, level 2.

Enjoy a relaxing traditional sauna experience with the Cozy Heat TW wood-burning sauna stove!

FEATURES

  • Wood-burning
  • Steel construction
  • Black color
  • Mild and long-lasting heat
  • Smoke gases are 6x cleaner
  • German BIMSCH certificate
  • Stove utilizes 25-40% less fuel than comparable sauna stoves
  • Boasts minimal safety distances
  • Floor mount thru-wall
  • Stone requirements:
    • 12kW - Minimum of 200 lbs of stones
    • 18kW - Minimum of 310 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 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 16.9"W (43 cm) x 26"D (66 cm) x 27.6"H (70 cm)
Stove Weight 126 lbs (57.2 kg)
Shipping Weight with Sauna Stones 346 lbs (156.9 kg)
Model COZY 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 19.7"W (49.9 cm) x 30.8"D (78.3 cm) x 29.8"H (75.6 cm)
Stove Weight 185 lbs (83.9 kg)
Shipping Weight with Sauna Stones 493 lbs (223.6 kg)

Required for Operation
Split Face Stones (12kW - 6 Boxes)
Cozy Heat Traditional Sauna Stones AC3020
Cozy Heat Premium Rounded Sauna Stones R-995

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Saunum AirSolo Wall

See manual
See warranty

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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