Commercial Sauna Heaters

The commercial sauna heater collection holds 17 Harvia and HUUM heaters: three Harvia electric heaters, three HUUM HIVE packages and eleven Harvia wood-burning stoves, rated by their makers for rooms of 212 to 1,766 cubic feet. The makers describe some for spas, gyms or public saunas and others for households.

Sizing a commercial sauna heater to the room's volume

A commercial sauna heater is sized to the room's volume: Harvia and HUUM print a minimum and maximum room volume for each model here, and the right model is one whose range covers the room. Both makers first add volume for walls that are not insulated. Harvia adds about 3.9 cubic feet for each square foot of uninsulated wall such as glass, brick, concrete or tile, counts a glass door, and multiplies the volume of a solid-log sauna by 1.5; HUUM adds 3.3 cubic feet for each square foot of uninsulated brick, tile or glass wall.

The 17 Harvia and HUUM heaters in this collection. Rating, room size (cubic feet), supply and amps are as each maker lists them; amps are the maker's total draw at the supply named. "Inside the sauna room" marks a stove whose Harvia manual gives it no through-the-wall fire-chamber extension. From is each listing's lowest current price across its models and options.
Model	Rating	Room size (maker)	Supply	Amps (maker)	Fire loaded from	From
Harvia Club Series Stainless Sauna Heater (10kW/ 12.5kW/ 15kW)	10, 12.5 or 15 kW	390–600 (10 kW), 500–750 (12.5 kW), 630–1,000 (15 kW) cu ft	240 V single-phase or 208 V three-phase version	41.7 / 52.7 / 61.7 A at 240 V; 27.3 / 34.1 / 40 A at 208 V	—	$2,023
Harvia Virta Pro 16kW Electric Sauna Heater \| HL160E	16 kW	354–918 cu ft	240 V single-phase	66.7 A in total, on 2 or 4 circuits: at most 33.3 A per circuit on 2, or 22.3 A per circuit on 4	—	$3,736
Harvia Virta Pro 20kW Electric Sauna Heater \| HL200E	20 kW	354–1,130 cu ft	208 V three-phase only	58.2 A in total, on 2 circuits	—	$4,943
HUUM HIVE 12kW Electric Sauna Heater Package	12 kW	424–636 cu ft	240 V	50 A	—	$5,963
HUUM HIVE 15kW Electric Sauna Heater Package	15 kW	530–813 cu ft	240 V	62.5 A	—	$6,203
HUUM HIVE 18kW Electric Sauna Heater Package	18 kW	636–989 cu ft	240 V	75 A	—	$6,471
Harvia Legend 150 16kW Wood Burning Sauna Stove \| WK150LD	16 kW	212–459 cu ft	Wood-fired	—	Inside the sauna room	$2,089
Harvia Legend 150 SL 16kW Wood Burning Sauna Stove \| WK150LDSL	16 kW	212–459 cu ft	Wood-fired	—	Another room or outside the building	$2,192
Harvia Legend 240 Duo 21kW Wood Burning Sauna Stove \| WKLE20DUOM	21 kW	353–848 cu ft	Wood-fired	—	Another room or outside the building	$3,003
Harvia Legend 240 SL 21kW Wood Burning Sauna Stove \| WKLE20SLM	21 kW	353–848 cu ft	Wood-fired	—	Another room or outside the building	$2,502
Harvia Legend 300 23kW Wood Burning Sauna Stove \| WKLE36M	23 kW	494–989 cu ft	Wood-fired	—	Inside the sauna room	$3,742
Harvia Pro 20 24.1kW Wood Burning Sauna Stove \| WKPR20M	24.1 kW	283–706 cu ft	Wood-fired	—	Inside the sauna room	$1,559
Harvia Pro 20 SL 24.1kW Through-Wall Wood Burning Sauna Stove \| WKPR20SLM	24.1 kW	283–706 cu ft	Wood-fired	—	The room on the other side of the wall	$1,781
Harvia Pro 20 Duo Steel 24.1kW Wood Burning Sauna Stove \| WKPR20DUOS	24.1 kW	283–706 cu ft	Wood-fired	—	The room next to the sauna	$2,871
Harvia Pro 36 31kW Wood Burning Sauna Stove \| WKPR36M	31 kW	494–1,271 cu ft	Wood-fired	—	Inside the sauna room	$2,364
Harvia Pro 36 Duo 31kW Through-Wall Wood Burning Sauna Stove \| WKPR36DUOS	31 kW	494–1,271 cu ft	Wood-fired	—	The room next to the sauna	$3,415
Harvia 50 (Pro 50) 40kW Wood Burning Sauna Stove \| WK500	40 kW	706–1,766 cu ft	Wood-fired	—	Inside the sauna room	$7,587

Narrow the heaters here by the room's volume, counted with those allowances:

For a room of 212 to 353 cubic feet: choose one of the Legend 150 stoves, which Harvia rates from 212 cubic feet, or, from 283 cubic feet, one of the Pro 20 stoves; no heater here is rated below 212 cubic feet, and no electric heater here below 354.
For a room of more than 353 and up to 1,000 cubic feet: choose by the building's supply or by where the fire will be tended, then check the room against that model's range in the table; the only electric heaters here rated below 390 cubic feet are the Virta Pro 16 and 20 kW, which Harvia rates from 354, and Harvia rates the Legend 150 stoves only up to 459.
For a room of more than 1,000 and up to 1,766 cubic feet: start with the heater whose range covers the room: the Virta Pro 20 kW (Harvia: up to 1,130 cubic feet), the Pro 36 or Pro 36 Duo (up to 1,271) or the Harvia 50 (up to 1,766), the one heater here that Harvia rates above 1,271 cubic feet; no heater here is rated above 1,766.

Electric heater supply: 240 V single-phase or 208 V three-phase

The six electric heaters in this collection each run on the supply their maker lists for that model, so the building's supply narrows the choice:

For a building with 208 V three-phase: choose the Harvia Club in its three-phase version or the Virta Pro 20 kW, the two heaters here that their maker lists for 208 V three-phase; Harvia lists the Virta Pro 20 kW for that supply only.
For a building with 240 V single-phase: choose the Club in its single-phase version or the Virta Pro 16 kW, which Harvia's manual has wired as two or four separate circuits.
For a HUUM HIVE package: HUUM lists the HIVE 12, 15 and 18 for a 240 V supply, so confirm the building has one before choosing a HIVE package.
Wiring: HUUM's UKU control manual says the electrical work it describes may only be performed by a licensed electrician. Your licensed electrician sizes the breaker and wire from the manual that ships with the heater and your local code.

Controls, Wi-Fi and stones for the electric heaters in this collection

Each electric heater in this collection runs from a separate control, and the Harvia electric heaters ship without stones, so the choice is between a HIVE package and buying a Harvia heater, its control and its stones separately:

Control and stones in the same listing as the heater: choose a HIVE package. Each of Topture's HIVE 12, 15 and 18 kW packages combines the heater with a HUUM UKU control (UKU Local Black, or UKU Wi-Fi with a Black, Glass or Mirror panel), HUUM's UKU Extension Box and HUUM Stones 24. HUUM's UKU runs heaters up to 11 kW on its own, so the HIVE 12, 15 and 18 need that Extension Box.
For a Harvia Club or Virta Pro: buy the control and the stones separately. Harvia's Virta Pro manual pairs the Virta Pro 16 kW with a Xenio CX45, alone or with the LTY45 power extension, on two circuits, or with a CX30 or CX45 plus the LTY45 on four circuits, and the Virta Pro 20 kW with a Xenio CX30 or CX45 plus the LTY45. The Club and Virta Pro product pages offer Harvia stones and control kits as add-ons, and the Virta Pro pages also offer the LTY45; to compare controls on their own, see sauna heater controls.
Control from the MyHarvia or HUUM app: for the Club, choose a Harvia Xenio in its Wi-Fi (-XW) version; for the Virta Pro, the Wi-Fi (-XW) version of the Xenio in Harvia's pairing above, or the Fenix FX45 with the LTY45, which Bathing Brands also lists for both Virta Pro models (Harvia's Xenio -XW and Fenix connect to the MyHarvia app); for a HIVE, the UKU Wi-Fi, which connects to the HUUM mobile app. The UKU Local is run from its wall panel only, with no app.

Wood stoves here: loaded inside the sauna room or through the wall

Each of the eleven Harvia wood-burning stoves in this collection is loaded either from inside the sauna room or through the wall, from another room or from outside the building:

Loading from outside the hot room: choose one of the six through-the-wall stoves here: Harvia says the Legend 150 SL, Legend 240 SL and Legend 240 Duo are for heating the sauna from another room or outside the building; Harvia's Pro 20 SL manual has the fire-chamber extension pushed through an opening in the wall, so the stove is loaded from the room on the other side, and on the Pro 20 Duo and Pro 36 Duo firewood is added, and ashes removed, from the room next to the sauna. For more stoves loaded this way, see outside-feed wood sauna stoves.
Loading at the stove, inside the hot room: choose the Legend 150, Legend 300, Pro 20, Pro 36 or Harvia 50.
Plan the stones and a chimney: every stove here ships without sauna stones, which Bathing Brands, Harvia's US distributor, says are sold separately, and without a chimney.

Commercial and household use of the heaters here, in the makers' words

Harvia and HUUM describe three of the heater lines in this collection for large saunas, clubs, spas, gyms or public saunas, and Harvia's website and manual differ on a fourth, the Virta Pro; its words and Harvia's on the other ten stoves here follow:

HUUM HIVE 12, 15 and 18: HUUM describes the HIVE electric heater as a stylish option for bigger saunas, ideal for spas or gyms.
Harvia Club: Harvia's Club manual says the KG heaters are designed for heating large saunas to bathing temperature, and harvia.com headlines the Club as a "super heater for a large club".
Harvia 50: Harvia's US site lists its user group as Professionals and presents it as a heater for public saunas, designed "for camp centres, sports centres and service sector businesses".
Harvia Virta Pro 16 and 20 kW: harvia.com describes the Virta Pro as giving ample heating power for saunas in spas, hotels and apartment buildings and as a heater for heavy-duty, professional use; the purpose line in its US manual, shared with the Virta, speaks of a well heat-insulated family sauna.
The other ten wood stoves: Harvia's US site lists the user group of every Harvia wood stove in this collection except the Harvia 50 as Households.

If you are buying a heater for a business, start with the HIVE, Club or Harvia 50, the three lines above, which between them are rated for rooms of 390 to 1,766 cubic feet. For a Virta Pro, or for a business sauna under 390 cubic feet, ask Topture before you order whether the heater and the maker's terms suit that use.

Topture is an authorized Harvia retailer and an authorized HUUM retailer, listed as an "E-shop" in HUUM's official dealer directory, and shipping on every heater here is included within the contiguous United States, with the stoves going by freight and the electric models usually by UPS or FedEx. Each heater includes the applicable manufacturer's warranty, subject to the manufacturer's terms, as set out on the Harvia sauna heaters and HUUM sauna heaters pages, and paying over time and help sizing a heater are covered on the sauna heaters page.

Commercial sauna heaters: next steps to the 15 kW+ heaters, wood-burning stoves and sizing help

Three ways to move from this commercial sauna heater collection to an order:

Electric at 15 kW or more: compare heaters listed at 15, 16 and 18 kW among the 15 kW+ sauna heaters.
Still deciding on wood heat: browse the wood-burning sauna heaters before you settle on a stove here.
Unsure of the size or the supply: before you order, send Topture's Lifetime Expert Support the room's dimensions, its glass and uninsulated wall area, the building's supply and how the sauna will be used.

Reviewed October 2026