Harvia HUUM Steel 4 Mini Series 3.5kW Electric Sauna Heater - H1007012
Introducing the HUUM Steel 4 Mini Series 3.5kW from My Sauna World, a perfect combination of compact design and powerful performance for easy installation in smaller spaces. is recognized for its commitment to quality, innovation, and sustainability, and this heater exemplifies those values, delivering an exceptional sauna experience that promotes relaxation, detoxification, and overall well-being. Imagine stepping into your own sauna, where the gentle heat rejuvenates both body and mind, enhancing your daily wellness routine with benefits like improved sleep and reduced muscle soreness, making it an ideal choice for wellness enthusiasts seeking convenience and luxury in their home spa experience.
What our Experts Think
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Compact premium engineering – The HUUM STEEL Mini 3.5kW (H1007012) is designed for very small sauna rooms (~3–6 m³ / 106–212 ft³), delivering efficient heating in tight spaces.
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Ultra-slim wall-mounted design – Its narrow vertical profile allows exceptionally small safety distances, making it ideal for minimalist or space-limited sauna builds.
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High stone capacity advantage – Despite its small size, it supports around 60–133 lb (27–60 kg) of sauna stones, producing softer, longer-lasting steam (löyly) instead of dry heat.
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Efficient heat performance – Internal air duct design enables up to ~25% faster heat-up, improving readiness time while maintaining stable output.
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Comfort-focused sauna experience – Experts highlight its smooth, even heat distribution, ideal for relaxed home sauna sessions rather than aggressive high-speed heating.
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Durable stainless-steel build – Built for long-term resistance to heat, humidity, and corrosion, ensuring consistent performance over time.
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Best for small modern saunas – Recommended for users who want a premium design heater with reliable steam quality in compact installations.
Q&A
Q: What sauna size is this heater suitable for?
A: Designed for very small sauna rooms, typically 3–5 m³ (106–177 ft³).
Q: What is the power output?
A: It delivers 3.5kW of electric heating for efficient performance in compact saunas.
Q: What makes the Steel Mini design special?
A: Its slim, wall-mounted stainless-steel design with high stone capacity delivers soft, even, and consistent steam (löyly).
Q: How much sauna stones does it hold?
A: Around 60 kg (≈132 lb) of stones for better heat retention and smoother steam output.
Q: Is it suitable for small home saunas?
A: Yes, it is specifically built for compact residential saunas with limited installation space.
Q: Does it heat efficiently?
A: Yes, internal air duct design helps it heat faster and maintain stable temperature.
Q: What control system is required?
A: It requires a separate sauna control unit (such as HUUM UKU), sold separately.
Q: What sauna experience does it deliver?
A: A gentle, even heat with long-lasting steam, ideal for relaxing low-power sauna sessions.
Maintenance Tips
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Clean exterior regularly to remove dust and maintain efficient heat performance.
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Inspect sauna stones every 2–3 months and replace any cracked or crumbling stones.
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Stack stones loosely and correctly to ensure airflow and protect heating elements.
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Check heating elements periodically for wear, discoloration, or uneven heating.
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Keep ventilation openings clear to support safe airflow and stable operation.
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Avoid excessive water pouring directly on elements to prevent damage and corrosion.
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Wipe interior surfaces after cooling to reduce moisture and mineral buildup.
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Ensure secure wall mounting by checking brackets and fixings regularly.
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Schedule annual electrical inspection for safe, long-term performance and reliability.
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