The Harvia M3 is a 16.5kW wood-burning sauna stove that brings authentic Finnish sauna tradition to residential cabins, off-grid retreats, and traditional sauna rooms. Designed for spaces between 160 and 460 cubic feet, the M3 combines a classic graphite black and stainless steel finish with a glass front door that lets you watch the fire as it heats the room. Adjustable legs, an integrated ash box, and a straightforward installation process make it a practical choice for homeowners who want a genuine wood-fired sauna experience without unnecessary complexity.
Why Customers Choose the Harvia M3
- Authentic wood-fired heat — no electricity required for operation
- Glass front door displays the fire and adds warmth to the sauna atmosphere
- 16.5kW output handles rooms from 160 to 460 cubic feet
- Graphite black and stainless steel finish suits both traditional and modern sauna interiors
- Adjustable legs provide stability on uneven floors
- Integrated ash box simplifies routine cleaning and maintenance
- Made in Finland by Harvia, a manufacturer with over 70 years of sauna equipment experience
Product Highlights
16.5kW Wood-Fired Output
The M3 delivers 16.5kW of heat output, making it suitable for sauna rooms ranging from 160 to 460 cubic feet. It reaches operating temperature efficiently and maintains consistent heat throughout the session.
Glass Front Door
The tempered glass front door allows you to view the fire during your session, contributing to the visual and sensory experience of a traditional wood-burning sauna.
Graphite Black and Stainless Steel Finish
The M3's classic Finnish aesthetic pairs a matte graphite black body with stainless steel accents, fitting naturally in both rustic cabin settings and contemporary sauna rooms.
Adjustable Legs
Leveling legs allow the stove to sit stably on uneven or sloped floors, reducing the need for additional floor preparation during installation.
Integrated Ash Box
The built-in ash collection box keeps the firebox clean and makes ash removal straightforward, reducing maintenance time between sessions.
No Electrical Connection Required
The M3 operates entirely on wood fuel, making it well-suited for off-grid cabins, remote retreats, or any location without reliable electrical service.
Made in Finland
Harvia has manufactured sauna equipment in Finland since 1950. The M3 reflects that heritage with materials and construction standards developed specifically for sauna environments.
Specifications
| Model | Harvia M3 |
|---|---|
| SKU | 120-WKM3 |
| Barcode | 6417659009423 |
| Power Rating | 16.5 kW |
| Fuel Type | Wood |
| Room Size (Min) | 160 cubic feet |
| Room Size (Max) | 460 cubic feet |
| Width | 15" (381 mm) |
| Depth | 18" (457 mm) |
| Height | 28" (711 mm) |
| Unit Weight | 97 lbs |
| Shipping Weight (with stones) | 163 lbs |
| Stone Capacity | 90 lbs (approx. 3 boxes of AC3020, sold separately) |
| Finish | Graphite black with stainless steel accents |
| Door | Tempered glass front door |
| Legs | Adjustable |
| Ash Management | Integrated ash box |
| Origin | Finland |
In the Box
- Harvia M3 Wood-Burning Sauna Stove
- Installation and Operation Manual
Sauna stones (90 lbs / approx. 3 boxes of AC3020) are sold separately. A chimney system is required and sold separately.
Ideal For
- Residential sauna rooms from 160 to 460 cubic feet
- Cabin and off-grid sauna installations without electrical service
- Traditional Finnish-style sauna builds
- Homeowners who prefer authentic wood-fired heat over electric alternatives
- Backyard sauna structures, outbuildings, and detached sauna rooms
Important Information
- Chimney system required: The M3 must be connected to a properly rated chimney system. The chimney is not included and must be purchased and installed separately in accordance with local building codes.
- Professional installation recommended: Installation must comply with all applicable local fire, building, and safety codes. Consult the included installation manual and verify requirements with your local authority having jurisdiction (AHJ) before installation.
- Clearance requirements: Maintain all minimum clearances from combustible walls, floors, and materials as specified in the installation manual. Failure to observe clearances creates a fire hazard.
- Stones not included: The M3 requires 90 lbs of sauna stones (approximately 3 boxes of Harvia AC3020). Stones must be purchased separately and loaded per the manufacturer's instructions before first use.
- Wood fuel only: Use only dry, seasoned firewood. Do not burn treated wood, painted wood, trash, or accelerants in this stove.
- Supervision required: Never leave a wood-burning stove unattended while in operation. Ensure a working carbon monoxide detector and smoke detector are installed in or near the sauna space.
Frequently Asked Questions
Does the M3 require electricity to operate?
No. The Harvia M3 is a wood-burning stove and operates entirely on wood fuel. No electrical connection is required for heating. This makes it suitable for off-grid cabins and locations without reliable electrical service.
What size sauna room is the M3 designed for?
The M3 is rated for sauna rooms between 160 and 460 adjusted cubic feet. Room sizing accounts for ceiling height, wall insulation, and glass area. If you are unsure whether the M3 is the right size for your room, contact us before ordering.
Are sauna stones included?
No. The M3 requires 90 lbs of sauna stones (approximately 3 boxes of Harvia AC3020 stones), which are sold separately. Stones must be loaded according to the manufacturer's instructions before first use.
Is a chimney included with the M3?
No. A chimney system is required for safe operation and must be purchased and installed separately. The chimney must be rated for wood-burning stove use and installed in compliance with local building and fire codes.
What type of wood should I use?
Use only dry, seasoned hardwood or softwood firewood. Do not burn treated lumber, painted wood, plywood, trash, or any material containing accelerants. Unseasoned or wet wood produces excess smoke and reduces heating efficiency.
Can the M3 be installed on an uneven floor?
Yes. The M3 includes adjustable legs that allow the stove to be leveled on uneven or slightly sloped floors, reducing the need for additional floor preparation.
Does the M3 come with an installation manual?
Yes. The M3 includes an installation and operation manual. All installations must comply with local fire, building, and safety codes. Consult your local authority having jurisdiction (AHJ) before beginning installation.
The Harvia M3 is a well-built, straightforward wood-burning sauna stove for homeowners who want authentic Finnish sauna heat without relying on electricity. If you have questions about room sizing, chimney compatibility, or required accessories, contact us before ordering — we're here to help you get the right setup from the start.
Sauna use is a personal wellness practice. Consult a qualified healthcare provider before use if you have any medical conditions, are pregnant, or are taking medications that may be affected by heat exposure.