Cozy Heat Sw Thru-Wall 12 And 18 Wood-Burning Sauna Stoves Together On Black Wood Cladding.
Cozy Heat Sw Thru-Wall 12 And 18 Wood-Burning Sauna Stove Options Shown Together.
Cozy Heat Sw Thru-Wall 12 Black Wood-Burning Sauna Stove
Cozy Heat Sw Thru-Wall 12 Current Manufacturer Product View
Cozy Heat Sw Thru-Wall 18 Black Wood-Burning Sauna Stove
Cozy Heat Sw Thru-Wall 18 Current Manufacturer Product View
Click to enlarge
Expert help that stays with you

Whether you’re choosing one component or planning the whole room, small details can become expensive problems once installation begins. We know the products we sell and the questions to ask early, helping catch mismatched components, overlooked requirements, and installation issues while they are still easy to fix.

Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

Sauna and heater customers also receive free shipping on sauna accessories for life.

Planning a sauna, or need help with one you purchased from us? Our founders have assembled many of the saunas we sell, visited the manufacturers, and use these products every day. New customers and existing Sauna Marketplace sauna and heater owners can Book a Ben consultation.

Specs
ModelCOZY 12 – 12 kW – 212–424 cu ft, COZY 18 – 18 kW – 318–636 cu ft
Attachments
Gallery
Cozy Heat Sw Thru-Wall 12 And 18 Wood-Burning Sauna Stoves Together On Black Wood Cladding.
Cozy Heat Sw Thru-Wall 12 And 18 Wood-Burning Sauna Stove Options Shown Together.
Cozy Heat Sw Thru-Wall 12 Black Wood-Burning Sauna Stove
Cozy Heat Sw Thru-Wall 12 Current Manufacturer Product View
Cozy Heat Sw Thru-Wall 18 Black Wood-Burning Sauna Stove
Cozy Heat Sw Thru-Wall 18 Current Manufacturer Product View
Click to enlarge

    Cozy Heat SW Thru-Wall Wood-Burning Sauna Stove – 12 & 18 kW

    Big stone presence without bringing the woodpile into the sauna. The SW Thru-Wall combines Cozy's tall wave-pattern guard with an extended firebox. You see and water the broad stone field inside while the fire is tended from the adjoining room.
    Choose 12 kW for 212–424 cu ft or 18 kW for 318–636 cu ft. The fire is loaded from the adjoining room through a properly built wall opening.
    The open cage holds 265–397 lb of stone, and Cozy designs and builds the heater in its own Estonian production facility.
    Stones and the chimney system are separate. Use the exact drawings and current manual below before framing the room.

    Build Your Quote:

    Starting at Price range: $2,452.50 through $2,884.50

    Share your selected heater size and add-ons. Prices and availability are confirmed when the link is opened.

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    Cozy Heat

    Big stone presence without bringing the woodpile into the sauna. The SW Thru-Wall combines Cozy's tall wave-pattern guard with an extended firebox. You see and water the broad stone field inside while the fire is tended from the adjoining room.

    The SW Thru-Wall surrounds Cozy’s three-path firebox with 265–397 lb of exposed stone. That reserve stores heat and gives water a broad surface for steam.

    Check height, depth, and the wall opening

    Model Adjusted sauna volume W × D × H Stone load Maximum log
    12 kW 212–424 cu ft 19.3 × 27.2 × 32.1 in 265 lb 13.0 in
    18 kW 318–636 cu ft 21.7 × 31.5 × 34.3 in 397 lb 15.7 in

    Use finished dimensions. Add about 4 cu ft per square foot of glass, tile, brick, concrete, or other uninsulated surface. Multiply a massive-log room by 1.5. Between sizes? Call before ordering.

    Put the fire door on the other side

    The extension passes through a noncombustible concrete or masonry opening so wood and ash stay in the adjoining room. The manual allows up to 5.9 in of wall thickness and gives separate opening clearances. Settle the detail with the installer before finishing the wall.

    Keep the efficiency claim in proportion

    Combustion air enters in three paths, including secondary air above the fuel. Cozy says the design uses about 25% less wood than comparable heaters; 40% occurred only in ideal tests. The manual reports 73.9% efficiency for the 12 family and 81.3% for the 18 family. European EN 15821 and BImSchV Stage 2 documents do not replace local code review.

    Before the stove arrives

    • Minimum side clearance to combustible material: 6.7 in for 12 kW; 9.1 in for 18 kW.
    • Rear clearance: 9.1 in. Front clearance: 19.7 in.
    • Clearance above the stove: 44.5 in for 12 kW; 52.8 in for 18 kW.
    • Required chimney draft: 12 Pa. Minimum smoke-flue cross-section: 12.2 sq in.
    • Stones, chimney, and any required floor or wall protection are sold separately.

    Cozy designs and builds these black-steel heaters in its Estonian facility. The U.S. warranty is 24 months. The current manual and exact drawings below control installation and stone loading.

    Want us to check the room math or chimney plan? Call or text (844) 565-1113 with the finished dimensions.

    Expert help that stays with you

    Whether you’re choosing one component or planning the whole room, small details can become expensive problems once installation begins. We know the products we sell and the questions to ask early, helping catch mismatched components, overlooked requirements, and installation issues while they are still easy to fix.

    Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

    We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

    Sauna and heater customers also receive free shipping on sauna accessories for life.

    Planning a sauna, or need help with one you purchased from us? Our founders have assembled many of the saunas we sell, visited the manufacturers, and use these products every day. New customers and existing Sauna Marketplace sauna and heater owners can Book a Ben consultation.

    Specs
    ModelCOZY 12 – 12 kW – 212–424 cu ft, COZY 18 – 18 kW – 318–636 cu ft
    Attachments
    Gallery
    Cozy Heat Sw Thru-Wall 12 And 18 Wood-Burning Sauna Stoves Together On Black Wood Cladding.
    Cozy Heat Sw Thru-Wall 12 And 18 Wood-Burning Sauna Stove Options Shown Together.
    Cozy Heat Sw Thru-Wall 12 Black Wood-Burning Sauna Stove
    Cozy Heat Sw Thru-Wall 12 Current Manufacturer Product View
    Cozy Heat Sw Thru-Wall 18 Black Wood-Burning Sauna Stove
    Cozy Heat Sw Thru-Wall 18 Current Manufacturer Product View
    Click to enlarge

      PLAN THE WHOLE SAUNA

      The room and heater still have to work as one system.

      Start with the room dimensions, then account for glass, masonry, insulation, ceiling height, required clearances, and available electrical service. That is how we move from a product that looks right to a sauna that heats evenly and comfortably.

      Compare sauna heaters

      See electric sauna heaters by output, stone mass, control style, and installation type. Size from adjusted room volume, not floor dimensions alone.

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      Shop complete saunas

      Explore indoor and outdoor saunas when you are planning beyond one component. Starting with the room makes heater size, controls, and accessories easier to get right.

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