The Harvia 50 SL is a large-capacity wood-burning sauna stove designed for commercial and high-use residential saunas. Built to heat rooms between 706 and 1,766 cubic feet, it features a through-wall firebox design that allows firewood to be loaded from outside the sauna room — so one group can enjoy the sauna while another tends the fire or relaxes by the cast-iron-framed glass door on the opposite side of the wall. With a substantial stone load capacity and a durable graphite-black finish, the 50 SL is a well-specified stove for facilities that require reliable, high-output wood-fired heat. UL listed and made in Finland by Harvia.
Why Customers Choose This Stove
- Through-wall firebox design — firewood is loaded from outside the sauna, keeping the sauna room clean and uninterrupted
- Large stone capacity supports even, sustained heat in high-volume sauna rooms
- Cast-iron-framed glass door on the firebox side allows viewing of the fire from outside the sauna
- Rated for rooms from 706 to 1,766 cubic feet — suitable for commercial and large residential installations
- Graphite-black painted finish with a clean, professional appearance
- UL listed for safety compliance in North American installations
- Made in Finland by Harvia, a well-established sauna equipment manufacturer
Product Highlights
Through-Wall Firebox Loading
The stove body sits inside the sauna room while the fire chamber door faces the adjacent room or corridor. Firewood is loaded from outside the sauna, allowing the sauna session to continue uninterrupted and keeping smoke and ash away from bathers.
Cast-Iron-Framed Glass Door
The firebox door features a cast-iron frame with a glass panel, allowing the fire to be viewed from the room outside the sauna. This is a practical feature for facilities where staff or guests tend the fire while others use the sauna.
Large Stone Capacity
The 50 SL accommodates a substantial volume of sauna stones (7 boxes required, sold separately), providing the thermal mass needed for consistent, even heat distribution in large sauna rooms. A large stone load also supports traditional steam (löyly) production.
Rated for Large Sauna Rooms
With a heating capacity of 706 to 1,766 cubic feet, the 50 SL is suited for commercial saunas in camp centers, sports facilities, spas, and large residential installations where standard residential heaters would be undersized.
Graphite-Black Painted Finish
The stove body is finished in graphite black, providing a clean, professional appearance that works well in both traditional and contemporary sauna interiors.
UL Listed — Made in Finland
The Harvia 50 SL is UL listed for safety compliance and manufactured in Finland by Harvia, a company with a long track record in sauna equipment production.
Specifications
| Model | Harvia 50 SL |
| Fuel Type | Wood-burning |
| Recommended Room Volume | 706–1,766 cubic feet |
| Dimensions | 21” D × 29” W × 42” H |
| Installation Type | Floor-standing, through-wall firebox |
| Stone Requirement | 7 boxes of sauna rocks (sold separately) |
| Firebox Door | Cast-iron frame with glass panel |
| Finish | Graphite black painted |
| Shipping Weight (approx.) | 300 lbs |
| Certifications | UL Listed |
| Country of Manufacture | Finland |
| Barcode (EAN) | 6417659001182 |
Ideal For
- Commercial saunas in camp centers, sports facilities, spas, and wellness centers
- Large residential saunas requiring wood-fired heat in rooms over 700 cubic feet
- Installations where the firebox must be loaded from outside the sauna room
- Facilities where multiple users occupy the sauna simultaneously and consistent heat output is required
- Owners who prefer traditional wood-fired sauna heat over electric alternatives
Important Information
- This is a wood-burning stove. Installation requires a properly constructed chimney system. Review the chimney installation requirements before ordering and ensure your installation complies with all applicable local building and fire codes.
- The through-wall firebox design requires a wall opening to be framed during construction. Consult the installation manual for wall opening dimensions, clearance requirements, and framing specifications before beginning installation.
- Sauna stones are not included. Seven boxes of sauna-rated stones are required. Use only stones rated for sauna use — standard rocks can crack or shatter under high heat.
- Maintain all minimum clearance distances specified in the installation manual between the stove body, flue pipe, and all combustible surfaces, walls, and benches.
- This stove is intended for indoor sauna use only. Do not operate in outdoor, unenclosed, or improperly ventilated environments.
- The stove must be installed on a non-combustible floor surface or a properly constructed non-combustible hearth pad. Verify requirements in the installation manual.
- This product is UL listed. Verify that your installation meets all requirements specified in the UL listing and the manufacturer’s installation documentation.
- Contact our team or a qualified installer if you have questions about chimney sizing, wall opening dimensions, or clearance requirements before ordering.
Frequently Asked Questions
What size sauna room is the Harvia 50 SL designed for?
The Harvia 50 SL is rated for sauna rooms between 706 and 1,766 cubic feet. To calculate your room volume, multiply the interior length × width × height. For rooms with large glass walls, high ceilings, or other features that affect heat retention, consult our team for sizing guidance before ordering.
How does the through-wall firebox work?
The stove body is installed inside the sauna room, while the fire chamber door faces an adjacent room or corridor through an opening in the wall. Firewood is loaded from outside the sauna, keeping the sauna room clean and allowing the session to continue without interruption. The cast-iron-framed glass door on the firebox side allows the fire to be viewed from outside the sauna.
Are sauna stones included?
No. Sauna stones are sold separately. Seven boxes of sauna-rated stones are required for this stove. Use only stones specifically rated for sauna use — standard rocks or landscaping stones can crack or shatter under high heat and should not be used.
Does this stove require a chimney?
Yes. The Harvia 50 SL is a wood-burning stove and requires a properly constructed chimney system for safe operation. Chimney sizing, clearance requirements, and installation specifications are detailed in the chimney installation manual. All chimney work must comply with local building and fire codes and should be performed by a qualified installer.
What wall opening is required for the through-wall installation?
The specific wall opening dimensions, framing requirements, and clearance distances are detailed in the installation manual. We recommend reviewing the manual before beginning construction so the wall opening can be framed correctly during the build.
Is the Harvia 50 SL UL listed?
Yes. The Harvia 50 SL is UL listed for safety compliance in North American installations.
Is this stove suitable for residential use?
The 50 SL is primarily designed for commercial and high-use facilities such as camp centers, sports facilities, and spas, but it is also suitable for large residential saunas with room volumes in the 706–1,766 cubic foot range. For smaller residential saunas, a lower-capacity stove would typically be more appropriate.
Where is the Harvia 50 SL manufactured?
The Harvia 50 SL is designed and manufactured in Finland by Harvia.
The Harvia 50 SL is a well-built, large-capacity wood-burning sauna stove for commercial and high-use installations. If you have questions about room sizing, chimney requirements, wall opening dimensions, or whether this stove is the right fit for your project, contact our team before ordering — we’re here to help.
This product is a wood-burning sauna stove intended for use in properly constructed sauna rooms. It is not a medical device and is not intended to diagnose, treat, cure, or prevent any disease or health condition. Consult a qualified healthcare provider before use if you have any medical concerns.