Description
The Cozy Heat Quattro Thru-Wall Sauna Stove combines the authentic experience of traditional wood-fired sauna heating with the convenience of a through-wall firebox design. Hand-crafted in Estonia, where sauna bathing is a daily ritual, this heater produces the soft, long-lasting warmth that traditional sauna users value.
The Quattro TW allows the firebox to extend through the sauna wall, making it possible to load firewood from outside the sauna room. This keeps the sauna interior clean and comfortable while maintaining the rustic charm of a real wood-burning sauna.
Designed for ladling water over heated stones, the heater creates rich steam that fills the sauna with relaxing heat and humidity. Its square structure and minimalist design complement both rustic and modern sauna environments, while the large viewing window allows you to enjoy the calming glow of the fire during your sauna session.
Available heating capacities:
12kW Model
For sauna rooms from 210 – 423 cubic feet
18kW Model
For sauna rooms from 317 – 635 cubic feet
Available Heating Options
The Cozy Heat OG sauna stove is available in two heating capacities depending on the size of your sauna room.
12kW Model
• Designed for sauna rooms 210 – 423 cubic feet
• Requires a minimum of 200 lbs of sauna stones
18kW Model
• Designed for sauna rooms 317 – 635 cubic feet
• Requires a minimum of 350 lbs of sauna stones
Selecting the correct heating capacity ensures efficient heat distribution and optimal steam production.
Heating Performance
Wood-burning sauna heaters deliver a softer and more natural heat compared to electric sauna heaters. The Cozy Heat Quattro TW is engineered to provide consistent radiant warmth while maintaining efficient combustion.
At the core of the heater is a 5mm thick stainless steel flame cutter, the most critical component of any wood-burning sauna stove. This durable design ensures reliability even under the intense temperatures of sauna operation.
Cozy sauna heaters are also designed for high efficiency, producing cleaner combustion while reducing firewood consumption.
Key Features
Square modern sauna stove design
Wood-burning sauna heater
Heavy-duty steel construction
Smoke gases are 6× cleaner than traditional heaters
Certified with German BIMSCH certificate
Consumes 25–40% less fuel than comparable sauna stoves
Minimal safety clearance requirements
Produces mild and long-lasting radiant heat
Floor-mounted through-wall installation
Large viewing window for fire display
Hand-crafted in Estonia
Stone Requirements
Proper sauna stones are required for safe and efficient operation.
12kW Model
Minimum 175 lbs of sauna stones
18kW Model
Minimum 265 lbs of sauna stones
Because natural stones vary in size and shape, purchasing an additional box of stones is recommended to ensure optimal fit and heat distribution.
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
Product Specifications
Technical
| Installation and Operational Manual | |
| Warranty |
Why Choose the Cozy Heat Quattro TW?
• Convenient firewood loading from outside the sauna
• Keeps the sauna interior clean
• Traditional wood-fired sauna experience
• Elegant square design with viewing window
• Efficient wood consumption and cleaner combustion