7 models · 2 brands
8 kW sauna heaters
Every 8 kW electric heater in our dataset, with the room volume its own manufacturer rates it for and the electrical figures that manufacturer actually publishes. Where a figure is missing, the cell says so. Nothing on this page is calculated from the kW rating.
What room a 8 kW heater is rated for
Across these 7 models the manufacturers’ own room-volume ratings span 141–431 ft³. That is a wide band for a single output, and the spread is real rather than a rounding artefact: makers rate the same wattage differently depending on how much cold surface — glass, stone, an uninsulated log wall — they assume in the room.
Take the band as the range of rooms the category is sold into, not as a recommendation for yours. A room at the top of one maker’s range may sit outside another’s at the identical output. The sizing calculator runs your own dimensions through each published rule separately and shows where they disagree, which is the part a single number hides.
What each manufacturer publishes for its 8 kW heaters
6 of 7 state a current draw, 0 state a breaker size, and 6 state a minimum wire size. Among those that publish a draw, the stated per-circuit figures run from 22.3 A to 33.4 A. These are transcriptions. We have not converted one figure into another, and we have not filled a gap with a calculation.
| Model | Room volume rated by maker | Voltage | Stated draw | Breaker stated | Min. wire stated |
|---|---|---|---|---|---|
| Finnleo Designer 8.0B | 250 ft³ @ 74"; 425 ft³ @ 96" | 240 V, 1 ph | 33.3 A | Not published | 8-2 W/G |
| Harvia Cilindro Half PC80 (HPCS8U1H)Multi-circuit | 141–431 ft³ (4–12 m³) | 2 × 240 V 1 ph | 33.4 A22.3 A | Not published | 8 AWG12 AWG |
| Harvia KIP80B (KIP-80-B1) | 7.1–12 m³ / 250–425 ft³ | 240 V, 1 ph | 33.3 A | Not published | 8/2 |
| Harvia KIP80W | 247–423 ft³ | 240 V | Not published | Not published | Not published |
| Harvia The Wall SW80 BlackSteel (HSW8U1B)Multi-circuit | 177–431 ft³ (5–12 m³) | 2 × 240 V 1 ph | 33.4 A22.3 A | Not published | 8 AWG10 AWG |
| Harvia The Wall SW80 Steel (HSWS8U1B)Multi-circuit | 177–431 ft³ | 2 × 240 V 1 ph | 33.4 A22.3 A | Not published | 8 AWG10 AWG |
| Harvia Virta HL80E (HL(S)8U1)Multi-circuit | 177–431 ft³ | 2 × 240 V 1 ph | 33.4 A22.3 A | Not published | 8 AWG12 AWG |
7 of these 7 models link a manufacturer manual or spec sheet. Open any model above to see its sources, its full specification, and where to buy it.
The multi-circuit models
4 of these 8 kW heaters need more than one supply circuit. In the table above their figures are shown per circuit and never added together, because two 30 A circuits is a materially different installation from one 60 A circuit — different conductors, different protective devices, sometimes a different panel. Treating the sum as a single figure is an electrical-safety error, not a simplification.
- Harvia Cilindro Half PC80 (HPCS8U1H)2 supply groups
- Harvia The Wall SW80 BlackSteel (HSW8U1B)2 supply groups
- Harvia The Wall SW80 Steel (HSWS8U1B)2 supply groups
- Harvia Virta HL80E (HL(S)8U1)2 supply groups
Close to 8 kW
Rooms rarely fall neatly onto a catalogue rating. These models sit within 0.9 kW of 8 kW and are worth checking if your room volume lands near the edge of the band above.
| Model | Output | Room volume rated by maker | Voltage | Stated draw | Breaker stated | Min. wire stated |
|---|---|---|---|---|---|---|
| HUUM DROP 7 | 7.5 kW | 248–389 ft³ (7–11 m³) | 240 V 1-phase | 31.25 A | 40 A | 8 AWG |
| Tylö Sense U8 Pure/Elite (SPU8) | 8.3 kW | 195–440 cu ft | 240 V, 1 ph | 35 A | Not published | 8 AWG |
| Tylö Sport SSU 8 | 8.3 kW | 195–440 cu ft | 240 V, 1 ph | 35 A | Not published | 8 AWG |
Questions people ask about 8 kW heaters
How many amps does a 8 kW sauna heater draw?
It depends on the model, and only the manufacturer can tell you. Of the 7 8 kW heaters here, 6 publish a figure, and those run from 22.3 A to 33.4 A per circuit. The rest do not state one. We will not compute a draw from the kW rating to fill those gaps, because the result would look like a specification while being our arithmetic rather than the maker’s data.
What size breaker does a 8 kW heater need?
That is a question for your electrician and your local code, not for a directory. Not one of these models states a breaker size in the documentation we could find. Where the maker is silent we leave the cell empty rather than deriving a number, and even where it is stated, the published figure assumes conditions that may not match your installation.
Is 8 kW enough for my sauna?
The models here are rated by their makers for rooms between 141 and 431 ft³, but that band assumes the construction each manufacturer had in mind. A glass door, a stone wall, or an uninsulated ceiling moves the answer. Put your actual dimensions into the sizing calculator: it applies each manufacturer’s published rule separately and shows you the spread between them rather than averaging them into one confident number.
Which brands make a 8 kW heater?
In this dataset: Finnleo, Harvia. That is what we have verified against manufacturer documents, not a claim about the whole market — how models get into the dataset is documented here.