$2,260.00 – $2,480.00
5.0
5.0
Mild, Long-Lasting Heat for 6–13 m³ Saunas
The CozyHeat Cozy12 O is a wood-burning sauna heater engineered for gentle, enduring warmth and rich steam. Designed for throwing water onto stones, it delivers the classic sauna feel while keeping comfort front and center. Suitable for sauna rooms of 6–13 m³, this 12 kW class stove is built by specialists with generations of know-how in Estonia and tested to European standards for clean, efficient performance.
Why Choose the CozyHeat Cozy12 O?
Key Features
Thoughtful Design Details
Technical Data (Cozy12 O)
Versatile Applications
Important Notes
Any questions? We’re here to help. Send us a message or chat with one of our sauna specialist.
Did you know? We offer one of Australia’s largest ranges of premium sauna products & materials — heaters, hot tubs, accessories, and more
The CozyHeat Cozy12 O is a premium wood-burning sauna heater crafted to deliver soft, long-lasting heat with authentic steam. With its 11.5 kW output, it is perfectly suited for sauna rooms between 6 to 13 cubic meters. Built in Estonia and TÜV tested, this stove meets German BImSchV clean burn standards, producing up to 6× cleaner flue gases than similar heaters while using up to 25–40% less wood fuel.
Designed for both Internal and External (through-wall) installations, the Cozy12 O features a durable steel body, efficient combustion system, and capacity for up to 120 kg of sauna stones (stones sold separately). Its compact clearances—only 17 cm from flammable materials without additional screens—make it a practical choice for various sauna setups.
With CozyHeat’s generations of sauna expertise, the Cozy12 O ensures even heat distribution, excellent steam generation, and energy efficiency, providing a traditional sauna atmosphere with modern engineering.
With a powerful 11.5 kW output, the CozyHeat Cozy12 O is designed for sauna rooms sized between 6 to 13 m³. Its advanced three-stage combustion system ensures efficient wood burning, cleaner flue gases, and a steady, comfortable heat throughout your sauna session.
The Cozy12 O accommodates up to 120 kilograms of sauna stones, allowing for excellent heat storage and smooth steam generation. This large stone capacity ensures mild, long-lasting heat with less frequent reloading, creating the ideal environment for traditional sauna bathing.
The Cozy12 O is fitted with a durable glass door that lets you enjoy the natural glow of the fire, enhancing the sauna atmosphere. Its sturdy steel frame ensures long-lasting reliability and adds a modern touch of elegance.
Designed with advanced airflow channels, the Cozy12 O burns wood more efficiently while reducing emissions. This system ensures cleaner flue gases, better heat output, and up to 25–40% less wood consumption compared to similar stoves.
Choose the setup that suits your space: the CozyHeat Cozy12 O is available in INTERNAL and EXTERNAL (through-wall) versions. It burns dry wood logs up to 30–33 cm with a typical max load of 8 kg. Compact clearances—only 17 cm to flammable materials at the sides—make placement easier, and the top flue outlet (Ø114 mm) connects cleanly to your chimney. Installation must follow the ventilation/clearance requirements and be completed by a qualified specialist.
The Cozy12 O features a three-stage air circulation system that optimizes burning efficiency. By directing air into different parts of the fire chamber, it ensures cleaner flue gases, more even heat distribution, and up to 40% less wood consumption compared to similar heaters.
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 (Internal) | COZY 12 SW (External) |
|---|---|---|
| Power Output | 11.5 kW | |
| Recommended Room Volume | 6–13 m³ | |
| Stone Capacity | Up to 120 kg (stones not included) | |
| Fuel Type | Wood logs, up to 30–33 cm | |
| Max Fuel Load | 8 kg | |
| Efficiency | 73.9% (EN 15821 tested) | |
| Heater Dimensions (L × W × H) | 524 mm × 450 mm × 700 mm | 671 mm × 450 mm × 700 mm |
| Weight of sauna stove | 49 kg | 57 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 O 11.5kW Wood-Burning Sauna Heater (Internal or External model)
Removable Ash Pan
Glass Door with Steel Frame
User Manual & Installation Instructions
Note: Sauna stones and flue kit are not included and should be purchased separately.
The CozyHeat Cozy12 O Wood-Burning Sauna Heater is your gateway to authentic sauna sessions. With its clean-burning efficiency, durable design, and capacity for up to 120 kg of stones, it delivers the perfect balance of heat and steam for a true wellness experience.
Ready to elevate your sauna time? Discover the CozyHeat range and explore premium sauna products at Shym Saunas — where tradition meets modern performance.
Subscribe to our newsletter and get the latest designs, pricing and updates about wooden saunas & hot tubs.
| Weight | 49 kg |
|---|---|
| Dimensions | 52 × 51 × 73 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:
$2,260.00 – $2,480.00
