$2,720.00 – $2,940.00
5.0
5.0
Mild, Long-Lasting Heat with the Elegant Cylindrical OG
The CozyHeat Cozy12 OG is an elegant cylindrical, wood-burning sauna heater engineered for soft, enduring warmth and rich steam. Built in Estonia by specialists with generations of know-how, it’s optimized for pouring water over stones to deliver traditional löyly. With a tested thermal output of 11.5 kW, the Cozy12 OG suits sauna rooms of 6–13 m³ and is available in INTERNAL or EXTERNAL (through-wall) variants.
Why Choose the Cozy12 OG?
Key Features
Important Notes
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The CozyHeat Cozy12 OG is an elegant cylindrical, wood-burning sauna heater crafted for soft, long-lasting heat and rich steam. With a tested output of 11.5 kW, it’s ideal for sauna rooms of 6–13 m³. Built in Estonia and TÜV tested to meet German BImSchV clean-burn requirements, it delivers up to 6× cleaner flue gases while using 25–40% less wood fuel than similar stoves.
Available in INTERNAL and EXTERNAL (through-wall) versions, the Cozy12 OG uses a three-stage combustion air system for efficient, even heating. It accepts up to 120 kg of sauna stones (stones sold separately), burns dry wood logs up to 30–33 cm with a typical max load of 8 kg, and offers compact clearances—only 17 cm to flammable materials at the sides without additional protection screens.
Backed by generations of sauna expertise, the Cozy12 OG provides balanced heat distribution, smooth steam generation, and energy-smart performance—bringing authentic löyly with modern engineering to your sauna.
With a powerful 11.5 kW output, the CozyHeat Cozy12 OG is designed for sauna rooms sized between 6 to 13 m³. Its three-stage combustion system delivers steady, comfortable heat with excellent fuel efficiency.
The OG accommodates up to 120 kilograms of sauna stones (stones sold separately), providing superb heat storage and smooth steam generation for mild, long-lasting löyly.
Combustion air is divided into three paths—through the grate, mid-chamber channels, and ceiling tubes—to reburn gases. Result: up to 6× cleaner flue gases and 25–40% less wood use compared to similar heaters.
The OG’s cylindrical form provides ample stone mass and a refined look that suits modern or traditional saunas, while supporting stable temperatures and gentle steam.
Available in INTERNAL and EXTERNAL (through-wall) versions. Burns dry wood logs up to 30–33 cm with a typical max fuel load of 8 kg.
Practical for tight layouts: side distance to flammable materials can be as low as 17 cm without extra protection screens. Standard clearances: Sides 170 mm, Back 230 mm, Front 500 mm, Ceiling 1130 mm.
Properly arranging sauna stones in your wood-burning heater is essential for both safety and performance. Follow these guidelines:
Use only suitable sauna stone materials such as peridotite, olivine diabase, olivine, or vulcanite.
Stones should be 5–15 cm in diameter. Select medium-sized, dense stones for optimal heat retention.
Wash the stones thoroughly to remove any dust or loose particles before placing them in the heater.
Place stones gently and evenly into the heater’s stone compartment — never drop them, as this can damage the heater or the stones.
Stack stones loosely to allow proper airflow between them. Good circulation ensures efficient burning and even heating.
Position stones so they support each other without blocking airflow through the heater.
Do not pile stones too high above the stone compartment — this can restrict ventilation and reduce efficiency.
Never place foreign objects (such as decorative stones or metal items) in the heater, as they may alter airflow or create safety hazards.
Correct stone placement helps your firewood heater burn more efficiently, extend its lifespan, and deliver the authentic, gentle heat that a traditional sauna is known for.
Sauna stones can disintegrate due to temperature fluctuations. Rearrange stones at least annually, or more often with frequent sauna use.
Remove any disintegrated stones from the heater’s bottom and replace them with new ones to maintain optimal heating and prevent overheating.
When using the heater for the first time, both the heater and stones may emit odors. Efficiently ventilate the sauna room to remove these odors. If the heater’s output matches the sauna room’s size, it will take about an hour for a properly insulated sauna to reach the desired bathing temperature. The sauna stones typically reach this temperature simultaneously with the sauna room.
| Specification | COZY 12 OG (Internal) | COZY 12 OG-TW (External / Through-Wall) |
|---|---|---|
| Power Output | 11.5 kW | |
| Recommended Room Volume | 6–13 m³ | |
| Stone Capacity | Up to 120 kg (stones not included) | |
| Fuel Type | Dry wood logs up to 30–33 cm | |
| Max Fuel Load | 8 kg | |
| Efficiency | 73.9% (EN 15821 tested) | |
| Heater Dimensions (L × W × H) | 546 × 498 × 709 mm | 696 × 498 × 709 mm |
| Weight of sauna stove | 61 kg | 71 kg |
| Safety Distances | Ceiling: 1130 mm / Sides: 170 mm / Back: 230 mm / Front: 500 mm | |
| Compliance | EN 15821:2010, BImSchV Level 2, TÜV SÜD tested | |
CozyHeat Cozy12 OG 11.5 kW Wood-Burning Sauna Heater (Internal or External variant)
Glass door with durable steel frame
Removable ash pan
Operating tool (stove iron) & safety glove/cloth
User manual & installation instructions
The CozyHeat Cozy12 OG brings authentic löyly to 6–13 m³ saunas with a clean-burning 11.5 kW output and an elegant cylindrical design. TÜV-tested to German BImSchV standards, it delivers soft, long-lasting heat with up to 120 kg of stones while using 25–40% less wood.
Ready to elevate your ritual? Explore CozyHeat heaters and matching accessories at Shym Saunas.
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| Weight | 65 kg |
|---|---|
| Dimensions | 52 × 52 × 74 cm |
| Firewood Feeding Variant | Internal, External |
| Accessories Info | Base Cozy |
|---|---|
| Weight | 17 kg |
| Dimensions | 50 × 50 × 5 cm |
| Additional Info | Purchased Separately |
| Accessories Info | Chimney Black COZY |
|---|---|
| Weight | 25 kg |
| Dimensions | 56 × 24 × 92 cm |
| Additional Info | Purchased Separately |
| Accessories Info | Protective Sheath COZY |
|---|---|
| Weight | 30 kg |
| Dimensions | 70 × 50 × 10 cm |
| Additional Info | Purchased Separately |
| Accessories Info | Backwall protection COZY |
|---|---|
| Weight | 30 kg |
| Dimensions | 70 × 50 × 5 cm |
| Additional Info | Purchased Separately |
| Accessories Info | Stones 20 kg |
|---|---|
| Weight | 20 kg |
| Dimensions | 40 × 30 × 15 cm |
| Additional Info | Purchased Separately |
Product Price:
$2,720.00 – $2,940.00
