HARVIA 50 Wood Burning Stove - WK500
The Harvia 50 SL black is a powerhouse designed for expansive sauna rooms ranging from 706 to 1,766 square feet. With a generous capacity for stones, it provides consistent heat and exceptional steam output, ensuring a comfortable and invigorating experience even in larger spaces.
What our Experts Think
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Massive professional-grade output (40 kW class)
The Harvia 50 (WK500) is widely recognized as a top-tier commercial wood-burning sauna stove, designed for very large sauna rooms (approx. 20–50 m³). It delivers extremely fast heat-up and powerful, stable temperatures even in demanding public use.
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Built for public & high-traffic saunas
Experts consistently classify it as a “king of public sauna heaters”, ideal for camps, sports centers, spa facilities, and large group bathing environments.
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Exceptional stone capacity for intense löyly
With ~120 kg of stones, it produces deep, continuous, high-volume steam (löyly)—maintaining heat consistency even in very large spaces.
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Extreme durability for continuous use
Heavy steel construction and industrial-grade build quality make it suitable for long operating cycles and frequent firing, where residential stoves would fail.
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Engineered for even heat distribution
The large stone mass and combustion design ensure uniform heat spread, reducing cold zones in oversized sauna rooms.
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Classic Finnish wood-fired experience at scale
Experts highlight that it preserves the traditional sauna atmosphere, but scaled for large groups without losing steam quality or authenticity.
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Best suited for professional installations only
Recommended for commercial facilities or very large custom saunas, not typical home use due to its size, fuel demand, and heat intensity.
Q&A
Q: What is the Harvia 50 (WK500) used for?
A: It is a high-capacity wood-burning sauna stove designed for very large sauna rooms and commercial facilities such as public saunas, spas, and sports centers.
Q: What makes this model so powerful?
A: It delivers approximately 40 kW of heat output and holds a very large amount of sauna stones, ensuring strong and even heat distribution for large groups.
Q: What sauna room size is it suitable for?
A: It is designed for extremely large sauna spaces of about 20–50 m³ (706–1766 ft³).
Q: Is this a residential or commercial unit?
A: It is primarily a commercial-grade sauna stove, used in public saunas, wellness centers, and high-traffic environments.
Q: What type of sauna experience does it provide?
A: It delivers a very traditional Finnish sauna experience with strong, consistent heat and rich steam (löyly), even in large spaces.
Q: What materials is it made from?
A: It features a durable steel body with a heat-resistant finish designed for long-term heavy-duty use.
Q: Does it require special installation?
A: Yes, it requires a proper chimney system, correct safety clearances, and professional installation due to its size and heat output.
Maintenance Tips
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Clean ash frequently: Remove ash after every use to maintain strong airflow and stable combustion performance.
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Use only dry, seasoned wood: Ensures efficient burning, higher heat output, and reduced soot buildup in chimney.
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Chimney maintenance: Inspect and clean flue regularly to prevent creosote buildup and maintain safe draft.
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Stone inspection: Check sauna stones annually; replace cracked stones and keep proper loose stacking for airflow and steam quality.
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Airflow control check: Ensure air intake and ash compartment are not blocked for proper combustion.
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Avoid overfiring: Do not overload wood—excess heat can overheat stove and chimney, reducing lifespan and safety.
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Exterior care: Wipe steel surfaces and check for rust or heat wear, especially in high-moisture sauna environments.
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Safe water use on stones: Use clean water only; avoid salt or mineral-heavy water that can corrode components.
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Annual professional inspection: Check firebox, chimney connection, and safety clearances for long-term commercial reliability.
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