Current English installation and operation manual – COZY 12 and COZY 18
Cozy Heat 12 and 18 installation and operation manual. Cozy Heat current manufacturer site.
Small details become expensive problems once installation begins. We ask the questions early, so a mismatched part, an overlooked requirement or an installation issue gets caught while it is 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 built saunas from the crate up and both run saunas at home. New customers and existing Sauna Marketplace sauna and heater owners can Ask a product question.
| Package | 12 kW + Split-Face Stones, 12 kW + Rounded Stones, 18 kW + Split-Face Stones, 18 kW + Rounded Stones |
|---|---|
| Tested Heat Output | COZY 12: 11.5 kW, COZY 18: 10.1 kW |
| Installation | In-room |
| Heat Source | Wood-burning |
| Mounting | Floor-standing |
| Made in | EstoniaAcross the Gulf of Finland, Estonia has a vibrant and growing sauna industry. They're known for innovative design, modern manufacturing, and premium sauna products at an affordable price. |
| Warranty | 2 years |
| Sauna Room Size | COZY 12: 212 to 424 cu ft · COZY 18: 318 to 636 cu ft |
| Sauna Ceiling Height | At least 72 in floor to ceiling; at least 81.7 in for the COZY 18 |
Cozy Heat 12 and 18 installation and operation manual. Cozy Heat current manufacturer site.
Cozy Heat two-year limited warranty. Current authorized U.S. warranty file.
The Quattro starts with square geometry and a real wood fire. Crisp horizontal bars give the heater a tailored profile rather than a round one. The working core has structural-steel firebox walls about 67% thicker than a typical standard-stove wall and clean, precise welds.
The stove uses about 25% less wood than comparable heaters while lighting and tending like a normal wood stove. Choose 12 or 18 kW before the selector adds the exact stone style and box count. Chimney and required protection are separate.
Starting at $2,448.00 – $3,177.00Price range: $2,448.00 through $3,177.00
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The Quattro starts with square geometry and a real wood fire. The Quattro replaces the round cage with crisp horizontal bars and a square footprint. It is the natural match for straight-grain cladding, dark interiors, and rooms where the heater should feel designed rather than rustic.
The package uses the same Cozy structural-steel firebox walls about 67% thicker than a typical standard-stove wall and clean, precise welds as the heater-only listing. Its three-path combustion uses about 25% less wood than comparable heaters, while the fire still lights, regulates, and refuels like a familiar wood stove.
Every option pairs the exact Cozy Heat Quattro heater with the package’s current stone-box count. Split-face stones give the cage a rougher, more architectural texture. Rounded stones make the visible field feel softer. Both choices are olivine diabase; the difference shown here is shape and appearance, not a promise that one produces better steam.
On a phone, swipe the table sideways to compare every column.
| Package option | Stone boxes | Manufacturer stone mass |
|---|---|---|
| 12 kW + split-face stones | 4 boxes | 265 lb required by the current manual |
| 12 kW + rounded stones | 4 boxes | 265 lb required by the current manual |
| 18 kW + split-face stones | 6 boxes | 353 lb required by the current manual |
| 18 kW + rounded stones | 6 boxes | 353 lb required by the current manual |
The table separates the package box count from the heater’s technical stone load. Stone size and packing change the final weight inside the cage, so follow the exact manual and keep the stove body covered without blocking airflow.
Choose 12 kW for an adjusted 212–424 cu ft room or 18 kW for 318–636 cu ft. Add about 4 cu ft for every square foot of glass, tile, brick, concrete, or other uninsulated surface; multiply a massive-log room by 1.5. The firebox door stays inside the sauna, keeping the flame and tending ritual in the room.
The current manual and 24-month limited warranty are in Manuals & Documents. Use them before the room is closed up.
Want us to check the room volume and loading side with you? Call or text (844) 565-1113 before choosing the package option.
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Write a reviewWhat customers say about working with our team. Names are shortened to a first name and last initial, or to initials.
★★★★★“Very happy with all aspects of the purchase transaction. Ben was great to work with!”
★★★★★“Man you are awesome and I will keep buying”
★★★★★“These guys have been excellent to work with. It wouldn’t have made sense to buy from anyone else. Top 5 customer service experience”
★★★★★“Very happy with all aspects of the purchase transaction. Ben was great to work with!”
★★★★★“Man you are awesome and I will keep buying”
★★★★★“These guys have been excellent to work with. It wouldn’t have made sense to buy from anyone else. Top 5 customer service experience”
★★★★★“Very happy with all aspects of the purchase transaction. Ben was great to work with!”
★★★★★“Man you are awesome and I will keep buying”
★★★★★“These guys have been excellent to work with. It wouldn’t have made sense to buy from anyone else. Top 5 customer service experience”
★★★★★“Very happy with all aspects of the purchase transaction. Ben was great to work with!”
★★★★★“Man you are awesome and I will keep buying”
★★★★★“These guys have been excellent to work with. It wouldn’t have made sense to buy from anyone else. Top 5 customer service experience”
★★★★★“Very happy with all aspects of the purchase transaction. Ben was great to work with!”
★★★★★“Man you are awesome and I will keep buying”
★★★★★“These guys have been excellent to work with. It wouldn’t have made sense to buy from anyone else. Top 5 customer service experience”
★★★★★“Very happy with all aspects of the purchase transaction. Ben was great to work with!”
★★★★★“Man you are awesome and I will keep buying”
★★★★★“These guys have been excellent to work with. It wouldn’t have made sense to buy from anyone else. Top 5 customer service experience”
Planning guides: How to choose a Cozy Heat stove · Sauna heater calculator
Small details become expensive problems once installation begins. We ask the questions early, so a mismatched part, an overlooked requirement or an installation issue gets caught while it is 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 built saunas from the crate up and both run saunas at home. New customers and existing Sauna Marketplace sauna and heater owners can Ask a product question.
| Package | 12 kW + Split-Face Stones, 12 kW + Rounded Stones, 18 kW + Split-Face Stones, 18 kW + Rounded Stones |
|---|---|
| Tested Heat Output | COZY 12: 11.5 kW, COZY 18: 10.1 kW |
| Installation | In-room |
| Heat Source | Wood-burning |
| Mounting | Floor-standing |
| Made in | EstoniaAcross the Gulf of Finland, Estonia has a vibrant and growing sauna industry. They're known for innovative design, modern manufacturing, and premium sauna products at an affordable price. |
| Warranty | 2 years |
| Sauna Room Size | COZY 12: 212 to 424 cu ft · COZY 18: 318 to 636 cu ft |
| Sauna Ceiling Height | At least 72 in floor to ceiling; at least 81.7 in for the COZY 18 |
Cozy Heat 12 and 18 installation and operation manual. Cozy Heat current manufacturer site.
Cozy Heat two-year limited warranty. Current authorized U.S. warranty file.
Heaters rated for the same rooms as the Cozy Heat Quattro, side by side. Rows that differ are marked in orange.
Swipe the table to see all 4 →
| Heater | This heaterCozy Heat Quattro | Harvia Legend 150Sized for smaller rooms | Harvia ProCosts $650 less | Harvia Legend 240 GreenFlameHolds 441 lb of stones |
|---|---|---|---|---|
| Price | From $2,448 | From $2,566 | From $1,788 | From $3,584 |
| Price includes | Package with stones | With the stones and the 6 in pipe adapter | With the stones and the 6 in pipe adapter | With the stones and the 6 in pipe adapter |
| Rated for rooms of | 212 to 636 cu ft | 212 to 459 cu ft | 283 to 1,271 cu ft | 353 to 706 cu ft |
| Power | – | 16 kW | 24.1, 26.6, 31 kW | 15.9 kW |
| Power supply | No circuit needed | No circuit needed | No circuit needed | No circuit needed |
| Start from a phone | No | No | No | No |
| Mounting | Floor | Floor | Floor | Floor |
| Loading the fire | Inside the sauna | Inside the sauna | Inside the sauna or From the next room | Inside the sauna |
| Stones | 176 to 287 lb | 265 lb | 88 to 132 lb | 441 lb |
| Ceiling height | At least 6 ft | At least 6 ft 7 in | At least 6 ft 9 in | At least 6 ft 11 in |
| Warranty | 2 years | 2 years | 2 years | 2 years |
| Made in | Estonia | Finland | Finland | Finland |
| Open | See the Harvia Legend 150 | See the Harvia Pro | See the Harvia Legend 240 GreenFlame |
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