Enter the inside size of your steam shower and we'll suggest a generator size in kW, using SteamSpa's published sizing rules and the steps in our steam generator sizing guide. Always check the spec sheet before you order.
Over 12 kW: SteamSpa's Black Series goes up to 24 kW, but SteamSpa doesn't publish room ratings for those sizes, so we check those by hand. Sloped ceilings aren't covered by any SteamSpa sizing rule we could find, so measure to the highest point and ask us.
| Generator | Current | Wire (AWG) | Max room |
|---|---|---|---|
| 4.5 kW | 19 A | 12 | 90 cu ft |
| 6 kW | 25 A | 10 | 150 cu ft |
| 7.5 kW | 32 A | 8 | 225 cu ft |
| 9 kW | 38 A | 8 | 300 cu ft |
| 10.5 kW | 44 A | 6 | 400 cu ft |
| 12 kW | 50 A | 6 | 450 cu ft |
Current and wire: SteamSpa Installation & User Guide, 240V single phase. Max room: SteamSpa spec sheets. Every size needs its own dedicated circuit, wired by a licensed electrician to code.
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