How to Size a Steam Generator: Matching kW to Your Steam Room Volume
Correct steam generator sizing is critical as it cannot be adjusted post-installation. Undersized units run continuously, cause limescale buildup, poor steam density and short service life. Oversized models waste power and trigger frequent cycling. Sizing follows five steps: calculate finished steam room volume, match it to 3–21kW generator ratings, upgrade power for glass walls, poor insulation, high ceilings or unsealed enclosures, confirm single/three-phase power supply, and adjust capacity for household, hotel or commercial continuous use. Common mistakes include measuring floor area only, ignoring heat loss issues and mismatching power supply, leading to inefficient operation and service faults.