Helo
Helo Cup STJ Electric Sauna Heater 9kW (3-Phase Only)
Helo Cup STJ Electric Sauna Heater 9kW (3-Phase Only)
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Description
Description
The Cup STJ is Helo’s classic wall-mounted electric sauna heater, handcrafted in Finland and valued for its timeless shape and straightforward controls. This 9 kW version heats sauna rooms of 9–14 m³ and connects to a three-phase supply only. A 23 kg stone capacity gives a soft, even steam, while the integrated thermostat and 9 hour pre-selection timer keep everyday use simple. The lightweight graphite black body mounts directly to the sauna wall, freeing up floor space in smaller rooms. Sauna stones are sold separately; Helo recommends smaller vulcanite stones under 10 cm.
Features
Technical Specification
| Model | Helo Cup 90 STJ |
| Output | 9 kW |
| Recommended sauna room volume | 9–14 m³ |
| Dimensions (H × W × D) | 580 × 410 × 300 mm |
| Weight without stones | 12.5 kg |
| Stone capacity | Approx. 23 kg |
| Colour | Graphite black |
| Controls | Integrated thermostat with 9 hour pre-selection timer |
| Installation | Wall-mounted |
| Safety clearances | |
| To the side walls | 100 mm |
| To the front | 200 mm |
| To the ceiling | 1,250 mm |
| To the floor | 120 mm |
| Electrical connection | |
| Supply | 400–415 V 3N~ (three-phase only) |
| Connection cable | H07RN-F 5 × 2.5 mm² |
| Fuses | 3 × 16 A |
Installation
Installation and maintenance must be carried out by a certified electrician, with the electricity supply isolated at the fuse panel before any work begins. Under IEC 60364-7-703 and BS 7671:2018 an electric sauna heater does not have to be connected through an RCD, and for reliable operation Helo recommends that the heater supply is not run through one; other electrical devices in the sauna room should be RCD protected. A local point of isolation covering all live conductors is recommended. The connection cable is heat-resistant H07RN-F (60245 IEC 66), and the installation manual in the Downloads tab and local wiring regulations must be followed.
Sauna stones
Sauna stones are purchased separately. This heater takes approximately 23 kg of stones, and Helo recommends smaller vulcanite stones under 10 cm.
Brand
Helo was founded in 1919 and was the first manufacturer of electric sauna heaters. Its heaters are still handcrafted in Hanko, Finland, and the company is part of the Sauna360 group.
Warranty
The warranty card is available in the Downloads tab.
Downloads
Delivery & Returns
Delivery
We offer fast and reliable delivery to customers across the UK and beyond. For full details on shipping times and costs, please review our delivery policy.
Returns
We offer hassle-free returns within 30 days of purchase, so you can shop with complete confidence. For details, see our returns policy.
Warranty & Quality Promise
We are committed to delivering products of the highest quality, for details surrounding warranty please contact us.
Description
The Cup STJ is Helo’s classic wall-mounted electric sauna heater, handcrafted in Finland and valued for its timeless shape and straightforward controls. This 9 kW version heats sauna rooms of 9–14 m³ and connects to a three-phase supply only. A 23 kg stone capacity gives a soft, even steam, while the integrated thermostat and 9 hour pre-selection timer keep everyday use simple. The lightweight graphite black body mounts directly to the sauna wall, freeing up floor space in smaller rooms. Sauna stones are sold separately; Helo recommends smaller vulcanite stones under 10 cm.
Features
| Model | Helo Cup 90 STJ |
| Output | 9 kW |
| Recommended sauna room volume | 9–14 m³ |
| Dimensions (H × W × D) | 580 × 410 × 300 mm |
| Weight without stones | 12.5 kg |
| Stone capacity | Approx. 23 kg |
| Colour | Graphite black |
| Controls | Integrated thermostat with 9 hour pre-selection timer |
| Installation | Wall-mounted |
| Safety clearances | |
| To the side walls | 100 mm |
| To the front | 200 mm |
| To the ceiling | 1,250 mm |
| To the floor | 120 mm |
| Electrical connection | |
| Supply | 400–415 V 3N~ (three-phase only) |
| Connection cable | H07RN-F 5 × 2.5 mm² |
| Fuses | 3 × 16 A |
Installation
Installation and maintenance must be carried out by a certified electrician, with the electricity supply isolated at the fuse panel before any work begins. Under IEC 60364-7-703 and BS 7671:2018 an electric sauna heater does not have to be connected through an RCD, and for reliable operation Helo recommends that the heater supply is not run through one; other electrical devices in the sauna room should be RCD protected. A local point of isolation covering all live conductors is recommended. The connection cable is heat-resistant H07RN-F (60245 IEC 66), and the installation manual in the Downloads tab and local wiring regulations must be followed.
Sauna stones
Sauna stones are purchased separately. This heater takes approximately 23 kg of stones, and Helo recommends smaller vulcanite stones under 10 cm.
Brand
Helo was founded in 1919 and was the first manufacturer of electric sauna heaters. Its heaters are still handcrafted in Hanko, Finland, and the company is part of the Sauna360 group.
Warranty
The warranty card is available in the Downloads tab.
Delivery
We offer fast and reliable delivery to customers across the UK and beyond. For full details on shipping times and costs, please review our delivery policy.
Returns
We offer hassle-free returns within 30 days of purchase, so you can shop with complete confidence. For details, see our returns policy.
Warranty & Quality Promise
We are committed to delivering products of the highest quality, for details surrounding warranty please contact us.
