Product Overview
The Cozy Heat O Through-Wall combines the rounded, stone-rich O-series design with an extended firebox that can be loaded from outside the sauna for a cleaner and more convenient bathing space.
Key Features
- Through-wall O-series design lets you tend the fire from outside the sauna while preserving the stone-rich look inside
- Generous stone capacity creates softer, fuller steam and steady radiant warmth
- Cozy Heat-engineered combustion is designed to reduce wood use while producing cleaner exhaust
- Distinctive rounded stone surround makes the heater a visual centerpiece of the sauna
Specifications
| Model |
Sauna Volume |
Stove Weight |
Stone Capacity |
Overall Efficiency |
Required Draft |
| 12 kW / HEAT12 |
210–423 cu. ft. (6–12 m³) |
125 lb |
200 lb |
73.9% |
12 Pa |
| 18 kW / HEAT18 |
317–635 cu. ft. (9–18 m³) |
181 lb |
290 lb |
81.3% |
12 Pa |
Additional Technical Data
- Fuel: natural wood logs
- Flue connection diameter: 4.48" (114 mm)
- Minimum smoke-flue cross-section: 12.7 sq. in. (7,850 mm²)
- Minimum ventilation-opening cross-section: 16.5 sq. in. (10,200 mm²)
Minimum Safety Clearances to Combustible Materials
| Model |
Sides |
Back |
Front |
Ceiling |
| 12 kW / HEAT12 |
6.69" (170 mm) |
9.05" (230 mm) |
19.68" (500 mm) |
44.48" (1,130 mm) |
| 18 kW / HEAT18 |
9.05" (230 mm) |
9.05" (230 mm) |
19.68" (500 mm) |
52.75" (1,340 mm) |
Sauna Stone Requirements
Sauna stones are required for operation and are not included. Approximate stone capacity for the O series is 200 lb for the 12 kW model and 290 lb for the 18 kW model; actual capacity depends on stone size. Use proper sauna stones and follow the manufacturer’s stone-placement instructions.
What's Included
Cozy Heat wood-burning sauna stove in the selected model, heater body and outer frame, 4.48" (114 mm) chimney connection pipe, upper cleaning hole/cleaning hatch, glass heater door, ash box, operating tool/safety cloth, installation and operation manual, and manufacturer's 24-month warranty. Sauna stones, complete chimney/flue system, floor/wall protection and installation accessories are not included unless specifically stated.
Through-Wall Installation Requirements
The TW combustion-chamber extension is designed for loading the stove through a wall. For installation in a concrete or brick wall, the manual specifies a minimum wall-opening width of 10.03" (255 mm) for HEAT12 and 12.40" (315 mm) for HEAT18, a minimum opening height from the floor of 17.32" (440 mm) for HEAT12 and 18.50" (470 mm) for HEAT18, and a maximum wall thickness of 5.9" (150 mm). Keep the firewood on the grate at the rear of the fire chamber and do not burn wood in the combustion-chamber extension.
Installation Note
Install on a floor with adequate load-bearing capacity and provide required noncombustible floor/wall protection, ventilation and chimney connection. The stove is not suitable for connection to a shared flue. Required clearances may be reduced only where the manufacturer permits an approved protective wall or equivalent protection. Installation must comply with the Cozy Heat installation manual and applicable local codes; professional installation may be required.
