
Firewood Sauna Heater CAGE is designed to create the best possible Soft Heat Experience. Experience the pinnacle of sauna comfort with CAGE wood-burning heaters. Encased in a sleek stainless steel cage, these heaters feature a generous abundance of stones, transforming your sauna into a sumptuous retreat. Enjoy an opulent experience even at lower temperatures, thanks to the ample stone layout that ensures a consistently cozy ambiance, maintaining warmth seamlessly throughout your relaxation.
FEATURES

Innovative Design for Effortless Comfort
The CAGE series boasts an innovative grate structure that optimises airflow, enhancing both efficiency and lifespan. This design allows for flexible bench placement, thanks to reduced safety distances from surrounding materials. With CAGE wood-burning heaters, you’ll enjoy unmatched comfort and convenience, bringing innovation and elegance to your sauna experience.
15 kW Power Output
Effectively heats sauna spaces ranging from 12–20 m³.
Wood-Fired Heat Source
Delivers powerful, natural warmth for a traditional sauna feel.
Protective Cage Design
Adds safety while enhancing stone exposure for better steam generation.
High Stone Capacity
Holds up to 35–40 kg of sauna stones for consistent, long-lasting heat and steam.

Flue Kit Included
Complete chimney system supports safe, code-compliant installation.
Instructions for Using Your Harvia Sauna Heater

Piling of the Sauna Stones
Properly arranging sauna heater stones is essential for both safety and warranty compliance. Follow these guidelines:
Use suitable sauna stone materials such as peridotite, olivine diabase, olivine, and vulcanite.
- Only use cleavage surfaces and/or rounded stones on your sauna heater.
- If heating elements come into contact with the stones, use rounded stones only in the outer layers of the stone space.
- Decorative stones should be placed loosely to allow air circulation and should not touch heating elements.
- Stones should be 5–15 cm in diameter.
- Wash off dust from the stones before piling them into the heater.
- When placing the stones, don’t drop stones into the heater.
- Don’t wedge stones between heating elements.
- Space stones to ensure proper air circulation.
- Pile stones to support each other rather than placing the weight on heating elements.
- Avoid forming a high pile of stones on top of the heater.
- Don’t place any objects or devices inside or near the heater that could alter airflow.
Heater Maintenance
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.
Heating Your Sauna with Harvia Sauna Heater
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.
SPECIFICATIONS
Specification | 15 kW Model | 25 kW Model |
---|---|---|
Power Output | 15 kW | 25 kW |
Recommended Room Size | 8–16 m³ | 16–25 m³ |
Dimensions (W×D×H) | 520 × 430 × 770 mm | 580 × 480 × 830 mm |
Stone Capacity | Up to 90 kg | Up to 140 kg |
Material | 3 mm Cast Iron Plates | 3 mm Cast Iron Plates |
Fuel Type | Firewood | Firewood |
Flue Outlet Diameter | 115 mm | 115 mm |
WHAT’S INCLUDED
- 15 kW or 25 kW Wood-Burning Sauna Heater
- Full Stainless Steel Flue Kit
- Removable Ash Drawer
- User Manual & Installation Guide
WARRANTY:
Residential Use: 3-Year Warranty (2 years standard + 1 extra year upon registration with sauna stone proof of purchase)
Commercial Use: Not applicable for this model
Experience Modern Luxury with Harvia Sauna Heater
The Harvia Vega Sauna Heater is your passport to a world of modern luxury and relaxation. Its elegant design, effortless operation, and ease of installation make it the perfect choice for those seeking the ultimate sauna experience.
Ready to transform your wellness experience? Explore the world of saunas and other spa products at Shym Saunas, dive in today!
