7.5kW Sauna Heaters

HUUM 7.5kW sauna heater: wall mounting and a separate control

HUUM's DROP is the heater on both listings in this collection, and HUUM's US manual rates its DROP 7 model at 7.5 kW. The HUUM Drop Sauna Heater Electric also sells the DROP's 4.5, 6 and 9 kW models, so choose its 7.5 kW option when you order; the HUUM DROP 7.5kW Electric Heater Package comes with the 7.5 kW model.

HUUM's manual attaches the DROP to the sauna wall on its mounting frame, and HUUM also allows the heater to be partly set into the sauna bench or floor with an embedding flange, an accessory. Choose the HUUM Flange D among the product page's add-ons if you want the heater partly set into the bench or floor; for a wall-hung DROP, leave it out.

The DROP has no built-in control. HUUM's US manual says it needs a separate control system, and HUUM names its UKU, the UKU Local or the UKU Wi-Fi, while its manuals also allow another certified sauna-heater control whose rated output covers the heater. A UKU can be set up to 230°F (110°C), or 194°F (90°C) with its bench sensor fitted. HUUM's control panels are listed under HUUM sauna controllers.

Supply and amps for a 7.5kW sauna heater

HUUM lists the DROP for a 240 V supply, and its US manual gives the 7.5 kW model's draw as 31.25 amps on 240 V.

Where the DROP runs from a UKU, HUUM's UKU manual calls for a dedicated circuit, recommends new wiring with the supply conductors sized from the heater's manual, and reserves that electrical work for a licensed electrician. Sauna electrical requirements walks through planning a home circuit for a heater.

If your electrician finds the supply cannot serve the 7.5 kW DROP's draw, choose a smaller model on the HUUM Drop Sauna Heater Electric listing, provided the room falls inside its range: HUUM lists the DROP's 6 kW model at 25 amps and its 4.5 kW model at 18.75 amps. Your licensed electrician sizes the breaker and wire from the manual that ships with the heater and your local code.

Room size for HUUM's 7.5kW sauna heater: 248 to 389 cubic feet

HUUM's current US manual sizes the DROP at 7.5 kW for sauna rooms of 248 to 389 cubic feet (7–11 m³). Multiply the room's length, width and height, then hold the result against HUUM's ranges:

• Under 248 cubic feet: rule out the 7.5 kW model. HUUM sizes the DROP's 6 kW model for 177–318 cubic feet and its 4.5 kW model for 106–248, so choose a model whose range holds your room; below 106 cubic feet, no DROP model here is sized for the room.
• From 248 to 389 cubic feet: choose the 7.5 kW model, which HUUM sizes for the whole span. Up to 318 cubic feet the room also sits inside the DROP 6 kW range, and from 283 inside the DROP 9 kW range; where more than one range holds the room, each of those outputs is within HUUM's rating, so let the circuit decide (HUUM lists the 9 kW model at 37.5 amps).
• Past 389 cubic feet: rule out the 7.5 kW model and choose a larger output whose maker sizes it for the room.

7.5kW sauna heater alone or with a UKU control and stones

The HUUM DROP 7.5kW Electric Heater Package combines the DROP's 7.5 kW model, a HUUM UKU control and HUUM stones in one item; its control is the UKU Local Black, or a UKU Wi-Fi with a Black, Glass or Mirror panel. The HUUM Drop Sauna Heater Electric ships without stones, which HUUM says the heater requires, and HUUM's manual puts the DROP's stone load at about 121.3 lb (55 kg); its product page offers HUUM stones and the UKU controls as add-ons.

• Heater, control and stones as one item: choose the package. Pick the UKU Local Black when a wall panel alone will do, since it runs from that panel only, with no app; pick a UKU Wi-Fi to run the sauna from the HUUM app.
• A UKU you already own, or another certified sauna-heater control whose rated output covers the heater: choose the heater alone and add the stones it needs.

Topture is an authorized HUUM retailer, listed as an "E-shop" in HUUM's official dealer directory. Both DROP listings here, and stones ordered with the heater, ship free within the contiguous United States, an electric heater usually by UPS or FedEx; the rest of buying a heater from Topture is on the sauna heaters page.

Next steps from a 7.5kW sauna heater: 6kW, 8kW or sizing help

Where HUUM's range or draw for the 7.5 kW model does not suit your sauna, one of these routes narrows the choice:

• A room under 248 cubic feet, or a supply your electrician finds cannot serve the 7.5 kW model's draw: step down to 6kW sauna heaters.
• A room past 389 cubic feet: HUUM sizes the DROP's 9 kW model for rooms up to 460 cubic feet; to compare heaters one output up from 7.5 kW, see 8kW sauna heaters.
• Unsure which DROP output your room and circuit call for: Topture's Lifetime Expert Support can set them against HUUM's figures with you before you order.

Reviewed October 2026