Cozy Heat Thru-Wall sauna heater with mesh stone cage and a lit firebox, angled view
Front view of the Thru-Wall heater with the firebox door ajar
Thru-Wall heater angled view with the firebox door closed
Thru-Wall heater with an extra stone cage on the chimney pipe, door open
Front view of the Thru-Wall heater with firewood in the firebox
Thru-Wall heater with chimney stone cage, angled from the loading side
Side view of the Thru-Wall heater with the loading door open
  • 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)
  • Wood-burning
  • Steel construction
  • Black color
  • Mild and long-lasting heat
  • Steel Construction
  • 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
  • Sauna room sizes:
    12kW - 210 to 423 cu.ft.
    18kW - 318 to 636 cu.ft.
  • Stone Requirements:
    12kW - minimum of 265lbs of stones
    18kW - minimum of 353lbs 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

The Cozy Heat Thru-Wall Sauna Heater is a wood-burning sauna heater designed for traditional sauna rooms that need floor-mounted thru-wall loading and mild, long-lasting heat. Engineered in Estonia with steel construction, cleaner smoke gas performance, reduced fuel use, minimal safety distances, and 12kW or 18kW sizing options, it offers an efficient heating solution for sauna rooms from 210 to 636 cubic feet.

Best Uses for the Cozy Heat Thru-Wall:

  • Best for sauna owners who want a wood-burning heater with thru-wall loading access.
  • Ideal for traditional sauna rooms sized from 210 to 636 cubic feet, depending on the selected model.
  • Well suited for buyers who want efficient fuel use, with 25%-40% less fuel consumption than comparable sauna stoves.
  • Great for users who want mild, long-lasting heat from a floor-mounted steel sauna heater.
  • Recommended for shoppers who value cleaner-burning performance and German BIMSCH certification.
  • A strong fit for installations that require large stone capacity for steady heat and steam performance.

INSTALLATION MANUAL

Yes, we really do offer FREE shipping! We will send your order at no additional cost to anywhere in the lower 48 states in the US. If you have questions about shipping to Alaska or Hawaii, please contact us through our live chat to discuss a custom freight quote.

Cozy Heat Thru-Wall Sauna Heater

$2,290.50 $2,545.00
You Save $254.50 (10% Off)
Free Shipping to the Lower 48 IconNo Surprises. Free Shipping to the Lower 48

  • 12kW - for saunas from 210 to 423 cu.ft.
  • 18kW - for saunas from 317 to 635 cu.ft.

  • 12kW - for saunas from 210 to 423 cu.ft.
  • 18kW - for saunas from 317 to 635 cu.ft.
Title :Default Title
Quantity:
Full Warranty IconFull Warranty
30 Day Returns Icon30-Day Returns (20% Restocking Fee)
Dedicated Support IconDedicated Support Team
Sauna Specialist
Exclusive Offer Talk to our Sauna Specialist to unlock an exclusive offer
  • 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)
  • Wood-burning
  • Steel construction
  • Black color
  • Mild and long-lasting heat
  • Steel Construction
  • 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
  • Sauna room sizes:
    12kW - 210 to 423 cu.ft.
    18kW - 318 to 636 cu.ft.
  • Stone Requirements:
    12kW - minimum of 265lbs of stones
    18kW - minimum of 353lbs 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

The Cozy Heat Thru-Wall Sauna Heater is a wood-burning sauna heater designed for traditional sauna rooms that need floor-mounted thru-wall loading and mild, long-lasting heat. Engineered in Estonia with steel construction, cleaner smoke gas performance, reduced fuel use, minimal safety distances, and 12kW or 18kW sizing options, it offers an efficient heating solution for sauna rooms from 210 to 636 cubic feet.

Best Uses for the Cozy Heat Thru-Wall:

  • Best for sauna owners who want a wood-burning heater with thru-wall loading access.
  • Ideal for traditional sauna rooms sized from 210 to 636 cubic feet, depending on the selected model.
  • Well suited for buyers who want efficient fuel use, with 25%-40% less fuel consumption than comparable sauna stoves.
  • Great for users who want mild, long-lasting heat from a floor-mounted steel sauna heater.
  • Recommended for shoppers who value cleaner-burning performance and German BIMSCH certification.
  • A strong fit for installations that require large stone capacity for steady heat and steam performance.

INSTALLATION MANUAL

Yes, we really do offer FREE shipping! We will send your order at no additional cost to anywhere in the lower 48 states in the US. If you have questions about shipping to Alaska or Hawaii, please contact us through our live chat to discuss a custom freight quote.

What Our Sauna Owners Say

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FAQ

GENERAL INQUIRIES

We are located in Indianapolis, Indiana.

Get what you need now with flexible ways to pay. Choose from payment and financing options at checkout, including installment plans that let you spread the cost of your purchase over time.

SHIPPING

Shipping in the Continental U.S. is free!

Since we carry different brands our products also ship from different locations.  See the list below:

  • Almost Heaven Saunas -  West Virginia
  • Dundalk Leisure Craft - Canada
  • Harvia - Portland
  • Baltic Leisure - Pennsylvania
  • Saunacore - Canada
  • TheraSauna- Iowa

The list below is the current delivery timeline by brand:

  • Almost Heaven Barrel Saunas - 6 to 8 Weeks
  • Almost Heaven Indoor Saunas - 4 to 6 Weeks
  • Amba Products - 1 to 2 weeks
  • Baltic Leisure - 3 to 4 weeks
  • Dundalk Leisure Craft -  Approximately 1 to 2 weeks after the estimated build date
  • Golden Designs Sauna - Within 1 week
  • Saunacore - 2 to 3 weeks
  • TheraSauna - 10 to 12 weeks

We currently do not ship to Alaska but if you are really interested we can request for a custom freight quote.

SAUNA ASSEMBLY

It is an easy assembly. Here is the link to our video gallery for a quick look.

The sauna comes in a crate. You'll need to assemble it but it is a very quick assembly.