HUUM STEEL Series Electric Sauna Heater
Floor-standing HUUM STEEL electric sauna heater, 6–10.5 kW for 177–566 cu ft rooms, holding about 330 lb of stones in a stainless-steel enclosure
- About 330 lb of stones for gentle, long-lasting steam
- Side clearance from 2 in, for compact sauna rooms
- App control with the HUUM UKU Wi-Fi
What Customers Say About This Product
“Powerful Steam The HUUM STEEL is the perfect solution for my small, modern home sauna. Its slender, square shape and incredibly small safety distances allowed…”
“The Urban Sauna Champion This heater is ideal for city apartments or converted closets. Its slim design is a minimalist triumph. The large stone capacity…”
- Description
- Specifications
- Installation
- What's Included
- Documents
- Warranty
What is the HUUM STEEL electric sauna heater?
The HUUM STEEL is a slim, floor-standing electric sauna heater from HUUM of Estonia: a stainless-steel enclosure, 38.4" tall and 12.6" square, that holds about 330 lb (150 kg) of stones. It comes in 6, 9 and 10.5 kW (HUUM's STEEL 6, 9 and 11) for sauna rooms from 177 to 566 cu ft, runs on 240 V or 208 V, and needs a separate HUUM UKU control and ten 33 lb boxes of stones.
The STEEL frames the natural stones in a stainless-steel enclosure. HUUM says the large stone load gives gentle, long-lasting steam, and that an internal air tunnel speeds heating by 25% and extends the life of the heating elements. HUUM makes its CLIFF heater's ribs from the steel cut out of the STEEL, so two heaters come from one sheet. HUUM says its small safety distances suit compact steam rooms.
How do you control the HUUM STEEL?
The STEEL has no built-in controls: it runs from a HUUM UKU control. UKU Local heats the sauna from the wall panel; UKU Wi-Fi adds the HUUM app, so you can start the sauna on your way home and schedule sessions ahead. The UKU runs heaters up to 11 kW on its own, so every STEEL size, the 10.5 kW included, works without an extension box. Topture also sells the STEEL as a package with the UKU control and stones included.
HUUM STEEL key features
- Floor-standing on four adjustable legs, anchored with the supplied brackets, or set partly into the bench with the HUUM Flange CS
- About 330 lb (150 kg) of 1.2–2" stones in a stainless-steel enclosure
- Side clearance of 2" on the 6 kW and 3.94" on the 9 and 10.5 kW
- Internal air tunnel that HUUM says speeds heating by 25%
- Designed and made in Estonia
- SGS listed to UL 60335-1 and CAN/CSA-C22.2 No. 60335-1
Which HUUM STEEL size fits my sauna?
Choose the STEEL by the volume of your sauna room. For every square foot of uninsulated brick, tile or glass wall, add 3.3 cu ft to the room volume before choosing. HUUM's warranty does not cover a heater whose output does not match the room volume. For rooms of 106–177 cu ft, HUUM makes the STEEL Mini; every STEEL size, as heaters and as packages, is in the HUUM STEEL collection.
| 6 kW | 9 kW | 10.5 kW | |
|---|---|---|---|
| HUUM model | STEEL 6 | STEEL 9 | STEEL 11 |
| Sauna room volume | 177–318 cu ft (5–9 m³) | 283–460 cu ft (8–13 m³) | 354–566 cu ft (10–16 m³) |
| Current at 240 V | 25 A | 37.5 A | 43.75 A |
| Circuit breaker | 30 A | 50 A | 50 A |
| HUUM part number | H1006012 | H1006022 | H1006032 |
Minimum wire size in HUUM's manual: 10 AWG for the STEEL 6 and 8 AWG for the STEEL 9. For the 10.5 kW, your electrician sizes the wire from the manual that ships with the heater and your local code.
| 6 kW | 9 kW | 10.5 kW | |
|---|---|---|---|
| Sauna room volume | 142–248 cu ft (4–7 m³) | 212–354 cu ft (6–10 m³) | 265–424 cu ft (7.5–12 m³) |
| Current at 208 V | 21.63 A | 32.45 A | 37.98 A |
| Circuit breaker | 30 A | 40 A | 50 A |
On a 208 V supply each size gives less output, so it heats a smaller room.
HUUM STEEL dimensions and stones
| Dimensions | 38.4" H × 12.6" W × 12.6" D (975 × 320 × 320 mm) |
|---|---|
| Heater weight | 33 lb (15 kg) for the STEEL 6 and STEEL 9 |
| Stones | About 330 lb (150 kg) of 1.2–2" (3–5 cm) stones: 10 boxes of HUUM Stones 12 (33 lb each) |
| Power supply | 240 V or 208 V, single phase |
| Materials | Stainless steel |
| Made in | Estonia |
| Certification | SGS listed to UL 60335-1 and CAN/CSA-C22.2 No. 60335-1 |
| Warranty | 3 years private use, 1 year commercial use (HUUM); heating elements, stones and sensors are excluded |
How is the HUUM STEEL installed?
The STEEL 6, 9 and 10.5 kW stand on adjustable legs and are anchored to the floor with the supplied brackets, screwed down with screws of preferably at least 6 × 40 mm; HUUM's SGS listing requires the anchoring. With the HUUM Flange CS the heater can instead sit partly inside the bench, with at least 21.7" (550 mm) of it above the bench surface. HUUM strongly recommends a safety rail around the heater, such as the HUUM Rail S.
HUUM's STEEL manual says the electrical connection must be made by a licensed electrician, with a circuit breaker that disconnects all poles fitted before the sauna control, a heat-resistant power cable (no PVC insulation) and a waterproof junction box no higher than 20" (50 cm) above the floor; the cable enters through the heater's bottom cover. Your electrician sizes the breaker and wire from the manual that ships with the heater and your local code.
HUUM STEEL safety distances
Keep at least these distances from the HUUM STEEL to walls, benches and anything that can burn. The letters match the drawing.
| 6 kW | 9 kW | 10.5 kW | |
|---|---|---|---|
| A | 2" (50 mm) | 3.94" (100 mm) | 3.94" (100 mm) |
| B | 16.5" (420 mm) | 20.5" (520 mm) | 20.5" (520 mm) |
- A: minimum distance from the heater to the walls beside it and in front of it, as HUUM's drawing marks A, and to anything that can burn
- B: minimum width between the walls on either side of the heater
- At least 47.3" (1,200 mm) from the top of the heater to the ceiling
- With a HUUM Reflect S hooked onto one side, HUUM says the heater's safety distance to flammable material on that side is halved
HUUM's STEEL manual gives a minimum sauna room height of 86.6" (2,200 mm), with a regular ceiling height of 86.6–91", allows only one heater per room, and calls for a sauna door that opens outward.
Stacking and caring for the stones
Wash the stones, then stack them loosely between the heating elements of the STEEL and close together on the outside so no element shows. Packed too tightly, the elements overheat, wear out sooner and heat the room more slowly; a sparsely filled heater is a fire hazard. Take care not to bend the elements. HUUM recommends having a specialist lay the stones. Stones crumble with use, so HUUM suggests ceramic tile with dark grout under and around the heater.
What's in the box with the HUUM STEEL?
- HUUM STEEL electric sauna heater, 6, 9 or 10.5 kW
- Four adjustable legs
- Floor brackets for anchoring the heater
- Installation and operation manual
What you need separately
- A HUUM UKU control: UKU Local or UKU Wi-Fi (no extension box needed for any STEEL)
- 10 boxes (330 lb) of HUUM Stones 12, 1.2–2" rounded stones
- A heat-resistant power cable, connected by a licensed electrician
- Optional: HUUM Rail S safety rail, HUUM Reflect S reflector or HUUM Flange CS embedding flange
HUUM warranty periods
HUUM's limited warranty (Limited Warranty Terms and Conditions, US, v2) covers new HUUM products bought from HUUM or its authorized dealers, such as Topture, against defects in materials and workmanship. The period starts on the date the end user buys the product.
| HUUM product | Private use | Commercial use |
|---|---|---|
| Electric sauna heaters | 3 years | 1 year |
| Wood-burning sauna stoves | 3 years | 1 year |
| Control units (UKU) | 3 years | 1 year |
| Spare parts | 1 year | 1 year |
HUUM counts as commercial use a business using the product commercially, a private owner using it commercially, or a private owner using it for more than 1,500 hours in 12 months.
What the warranty does not cover
- Heating elements of electric heaters
- HUUM accessories, such as rails, reflectors, flanges, protective bedding and chimney parts
- Door glass and ash grate of wood-burning stoves
- Sauna stones
- All controller sensors
- Damage from a heater that is the wrong size for the room, from unsuitable stones, or from installation, use or maintenance that does not follow HUUM's manuals
What keeps the warranty in effect
- Inspect the product when it arrives and report any visible damage within 7 days, with photos, before installing it.
- Install it following HUUM's manual and local building, electrical and fire codes. An electric product must be connected by a licensed electrician, with proof of the installation.
- Report a defect within 30 days of finding it. For products bought from Topture, report it to Topture, which passes the claim to HUUM and helps with troubleshooting.
