Harvia Hidden Heater
Harvia Hidden Heater
Harvia Hidden Heater
Harvia Hidden Heater
Harvia Hidden Heater

Harvia Hidden Heater Behind-Bench Electric Sauna Heater

Harvia Hidden Heater is a stainless-steel, behind-the-bench electric sauna heater that frees bench space in home and commercial saunas. Its concealed mounting supports flexible bench layouts while maintaining a clean, minimalist interior.

Choose HH3 (2.9 kW, 2–4 m³), HH6 (6.0 kW, 6–10 m³), HH9 (9.0 kW, 10–14 m³), or HH12 (12.0 kW, 12–17 m³); all models require a compatible separate control unit.

As a product of the leading Finnish brand Harvia, this sauna heater reflects decades of expertise in sauna craftsmanship and premium quality. Every Harvia Hidden Heater unit is built to meet the highest standards of safety and durability, giving you complete peace of mind for years of enjoyment.

Complete your sauna setup by exploring our full range of sauna accessories, and feel free to learn more about us and our commitment to helping you build the perfect sauna experience.

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CE Certified
OEM Available
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Technical Specifications

Detailed performance data for all available models in the Harvia Hidden Heater Behind-Bench Electric Sauna Heater series.

Specification HH3 HH6 HH9 HH12
Model HH3 HH6 HH9 HH12
Power (KW) 2.9 6.0 9.0 12.0
Room Volume (m³) 2-4 6-10 10-14 12-17
Stone Weight (KG) ø 5-10cm 12 15 15 15
400V 3N~cable (mm²) Connect to controller 5x1.5 5x1.5 5x2.5 5x4.0
400V 3N~cable (mm²) To sauna heater 5x1.5 5x1.5 5x2.5 5x2.5
400V 3N~cable (mm²) To junction box 5x1.5 5x1.5 5x2.5 5x2.5
400V 3N~ Fuse (A) 3x10 3x10 3x16 3x20
Minimum safe distance: A_min (mm) 75 75 75 90
Minimum safe distance: B_min (mm) 75 75 90 120
Wire connected to the sensor mm² 4x0.25 4x0.25 4x0.25 4x0.25
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Frequently Asked Questions

Which sauna room sizes does the Harvia Hidden Heater Behind-Bench Electric Sauna Heater cover?

Published ratings: HH3 (2.9 kW) suits 2-4 m3 rooms; HH6 (6.0 kW) suits 6-10 m3 rooms; HH9 (9.0 kW) suits 10-14 m3 rooms; HH12 (12.0 kW) suits 12-17 m3 rooms. Pick the model whose range covers your room volume.

How do I choose between the HH3 and the HH12?

The published difference is capacity: HH3 is 2.9 kW for 2-4 m3 rooms; HH6 is 6.0 kW for 6-10 m3 rooms; HH9 is 9.0 kW for 10-14 m3 rooms; HH12 is 12.0 kW for 12-17 m3 rooms. Measure your sauna in cubic metres and pick the model whose range covers it. If your room falls in an overlap zone, send your exact room details via the quote form and we will size it for you.

How much clearance does the Harvia Hidden Heater Behind-Bench Electric Sauna Heater need when installed?

Published minimum safe distances in mm: to the side (A_min) HH3 = 75; HH6 = 75; HH9 = 75; HH12 = 90; to the ceiling direction (B_min) HH3 = 75; HH6 = 75; HH9 = 90; HH12 = 120. The full installation data is in the specification table above.

Can I buy the Harvia Hidden Heater Behind-Bench Electric Sauna Heater wholesale for a hotel or spa project?

Yes. As an authorized Harvia distributor we supply this heater to hotels, spas and dealers. For project pricing, reach out via the quote form on this page and our team will help you directly.