Harvia
SAUNA WOODBURNING STOVE HARVIA 20 PRO
SAUNA WOODBURNING STOVE HARVIA 20 PRO
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The Harvia 20 Pro (WKPR20M) is a high-performance wood-burning sauna heater from Harvia, crafted for medium-sized saunas of 8 to 20 m³ where powerful, consistent heat, soft steam, and a genuine Finnish sauna experience are the priority. It combines a premium graphite steel body with a polished stainless steel front panel featuring Harvia's signature ventilation line geometry — making it as visually impressive as it is functional.
At the core of its performance is a cast iron top plate, 10 mm thick — one of the thickest in its class — which absorbs, stores, and radiates heat with exceptional durability across years of extreme temperature cycling. The enlarged stone basket holds up to 40 kg of sauna stones with efficient air circulation, ensuring thorough stone heating and rich, full-bodied steam. A cast iron door with glass window lets you observe the fire and maintain the meditative atmosphere of the sauna ritual.
Water heating is available via an optional side or chimney-mounted tank (purchased separately), making this a versatile choice for home and small commercial sauna installations alike.
Specifications
| Model Code | WKPR20M |
| Power | 18 kW |
| Sauna Volume | 8 – 20 m³ |
| Dimensions (H × W × D) | 760 × 430 × 510 mm |
| Weight | 60 kg |
| Maximum Stone Load | 40 kg |
| Top Plate Thickness | 10 mm cast iron |
| Door Material | Cast iron with glass |
| Body Finish | Graphite matte heat-resistant coating |
| Front Panel | Polished stainless steel |
| Flue Diameter | 115 mm |
| Safety Distances (ceiling / sides) | 1300 / 500 mm |
| Water Tank | 0 L — optional side or chimney-mount tank (sold separately) |
What's Included
- Harvia 20 Pro wood-burning sauna heater
- Cast iron door with glass
Note: Sauna stones, water tank, and flue/smoke pipes are not included and must be purchased separately.
Installation
- Position the heater on a non-combustible, structurally sound base (weight: 60 kg without stones).
- Maintain mandatory safety clearances: 1300 mm to the ceiling, 500 mm to combustible side walls.
- Connect a 115 mm diameter flue pipe and route it to an appropriate chimney system.
- Fill the stone basket with approved sauna stones (up to 40 kg); do not exceed this limit.
- Optionally install a water tank (side or chimney-mounted) for hot water access during sessions.
- Commission the heater by running 2–3 low-intensity fires before full-load use. Refer to the Harvia user manual for full details and safety instructions.
🔒 3 Year Warranty Included
What size sauna is the Harvia 20 Pro suitable for?
The 20 Pro is rated for sauna rooms of 8 to 20 m³, making it suitable for small home saunas right up to larger private or small commercial steam rooms. Its 18 kW output ensures rapid and thorough heating across this volume range.
Can I add a water tank to the Harvia 20 Pro?
Yes — the 20 Pro supports an optional water tank, mountable either on the side or on the chimney pipe. The tank is purchased separately. This allows you to have hot water available throughout your sauna session.
Are sauna stones included?
No. The stone basket accepts up to 40 kg of sauna-rated stones, which are sold separately. Always use stones specifically approved for wood-burning sauna heaters to prevent cracking and ensure safe steam.
Why is the cast iron top plate notable?
At 10 mm thickness, the top plate on the 20 Pro is among the thickest in its class. Cast iron retains heat exceptionally well and can withstand rapid thermal cycling without warping — extending the working life of the heater significantly.
Are flue and chimney pipes included?
No — flue pipes are not included. You need a 115 mm diameter flue system. We stock both metal smoke pipes and stainless steel chimney systems in our store.
Is the Harvia 20 Pro CE certified?
Harvia heaters are manufactured to meet European quality standards. Please refer to the product documentation and user manual for specific certification details.
Delivery: This item is dispatched from our UK warehouse. At 60 kg, delivery is arranged via a specialist freight/pallet service. You will be contacted to book a suitable delivery window. Estimated lead time is 3–7 working days.
Returns: We accept returns within 30 days of receipt for unused, uninstalled items in their original packaging. Return freight costs for large/heavy items are the buyer's responsibility unless the product is faulty or incorrectly supplied. Please inspect your delivery upon arrival and report any damage within 48 hours with photographs so we can resolve the matter promptly.
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