The Harvia Pro 20 (WKPR20M) is a high-output wood-burning sauna stove built for medium-sized sauna rooms. Delivering 24kW of steady, radiant heat with an 88 lb stone capacity, it produces the deep, enveloping warmth that defines a traditional Finnish sauna session. The cast-iron-framed glass door adds a warm, atmospheric glow, while the durable graphite black steel construction ensures long-term reliability. Designed and manufactured in Finland, the Pro 20 is a trusted choice for homeowners and sauna builders who want authentic performance without compromise.
Why Customers Choose the Harvia Pro 20
- Authentic Finnish engineering with decades of proven sauna heritage
- 24kW output handles rooms up to 706 cubic feet with consistent heat
- 88 lb stone capacity for rich, sustained steam (löyly)
- Cast-iron glass door adds ambiance and lets you monitor the fire
- Flexible top and rear flue connections simplify installation planning
- Adjustable feet accommodate uneven floors without shimming
- Graphite black finish with stainless steel accents for a clean, modern look
- Backed by a 2-year limited warranty for consumer use
Product Highlights
24kW Wood-Burning Output
Engineered for sauna rooms from 283 to 706 cubic feet, the Pro 20 reaches and holds high temperatures efficiently using standard firewood.
88 lb Stone Capacity
A generous stone load retains heat and produces consistent steam when water is poured, supporting a full, satisfying sauna session.
Cast-Iron Framed Glass Door
The viewing window lets the fire's glow fill the sauna room, enhancing the traditional atmosphere while allowing easy fire monitoring.
Dual Flue Connection Options
Top and rear flue outlets give installers flexibility to route the chimney based on the sauna's layout and ceiling configuration.
Durable Graphite Black Steel Construction
Heavy-gauge steel with stainless steel components resists warping and corrosion, maintaining structural integrity through repeated high-heat cycles.
Designed and Made in Finland
Harvia has manufactured sauna equipment in Finland since 1950. The Pro 20 reflects that tradition of quality craftsmanship and thermal engineering.
Specifications
| Model | PRO 20 (WKPR20M) |
|---|---|
| Output | 24 kW |
| Primary Fuel | Wood |
| Max Firewood Length | 15 in (39 cm) |
| Firewood Diameter | 3–6 in (8–15 cm) |
| Room Volume (Min) | 283 cu ft |
| Room Volume (Max) | 706 cu ft |
| Minimum Room Height | 82 in (209 cm) |
| Stone Capacity | 88 lbs (sauna stones sold separately) |
| Flue Connection | Top and Rear |
| Heater Weight | 132 lbs (60 kg) |
| Shipping Weight (with stones) | 220 lbs (100 kg) |
| Width | 16.9 in (43 cm) |
| Depth | 20 in (51 cm) |
| Height | 29.9–31.1 in (76–79 cm) |
| Finish | Graphite Black Steel / Stainless Steel |
| Origin | Finland |
| Warranty | 2-Year Limited (Consumer) / 6-Month Limited (Commercial) |
| SKU | 120-WKPR20M |
| Barcode | WK200 |
What's in the Box
- Harvia Pro 20 Wood-Burning Sauna Stove
- Cast-Iron Framed Glass Door
- Ash Box
- Adjustable Legs
- Installation and Operation Manual
Note: Sauna stones are not included and must be purchased separately.
Ideal For
- Residential sauna rooms from 283 to 706 cubic feet
- New sauna builds and full sauna kit installations
- Homeowners seeking a traditional wood-fired sauna experience
- Sauna builders and contractors sourcing high-output Finnish stoves
- Cabins, lodges, and off-grid properties without reliable electrical service
Important Information
- Professional installation by a licensed contractor is strongly recommended. Local building codes and fire safety regulations must be followed.
- Maintain required clearances to combustible materials as specified in the installation manual. Do not reduce these clearances.
- Use only dry, seasoned hardwood. Do not burn treated lumber, garbage, or accelerants.
- Sauna stones are not included. Use only stones rated for sauna use; do not substitute with river rocks or unrated materials.
- This stove requires a properly sized and rated chimney system. Refer to the installation manual for flue diameter and height requirements.
- Never leave a burning stove unattended. Ensure the fire is fully extinguished before leaving the sauna.
- This product is intended for sauna heating use only. Do not use for space heating, cooking, or any other purpose.
Frequently Asked Questions
What size sauna room is the Harvia Pro 20 designed for?
The Pro 20 is rated for sauna rooms between 283 and 706 cubic feet. For best results, match the stove to your room's actual volume. If you're unsure, use a sauna heater sizing calculator or consult a sauna builder before purchasing.
Are sauna stones included with the Pro 20?
No. Sauna stones are sold separately. The Pro 20 requires approximately 88 lbs of sauna-rated stones. Use only stones specifically designed for sauna use to ensure safe heat retention and steam performance.
What type of wood should I use?
Use dry, seasoned hardwood such as birch, oak, or alder. Firewood should be no longer than 15 inches and between 3 and 6 inches in diameter. Avoid treated wood, softwoods with high resin content, or any material not intended for combustion in a sauna stove.
Can I connect the flue from the top or the back?
Yes. The Pro 20 supports both top and rear flue connections, giving you flexibility to route the chimney based on your sauna's ceiling height and wall configuration. Refer to the installation manual for flue diameter specifications and clearance requirements.
Does this stove require professional installation?
Professional installation by a licensed contractor is strongly recommended. Wood-burning sauna stoves must comply with local building codes, fire safety regulations, and chimney standards. Improper installation can create fire hazards and may void the warranty.
What warranty does the Harvia Pro 20 carry?
The Pro 20 includes a 2-year limited warranty for consumer use and a 6-month limited warranty for commercial use. Warranty coverage is subject to proper installation and use as described in the product manual.
Where is the Harvia Pro 20 manufactured?
The Harvia Pro 20 is designed and manufactured in Finland. Harvia has been producing sauna equipment since 1950 and is one of the most recognized sauna brands in the world.
The Harvia Pro 20 is a well-built, high-output wood-burning sauna stove for those who want a genuine Finnish sauna experience at home. If you're ready to move forward or have questions about sizing and installation, our team is here to help you choose the right setup for your space.
Sauna use may not be suitable for everyone. Consult a qualified healthcare provider before use if you have a medical condition, are pregnant, or are taking medications. This product is not intended to diagnose, treat, cure, or prevent any disease or medical condition.