KOHLER K-1733-NA 9 kW Fast-Response Steam Generator Fast-Response technology produces steam in just one minute instead of waiting four minutes PowerClean technology automatic cleaning feature at the touch of a button Larger size generators; 5 kW through 30 kW now available To be used on showers 113 - 240 cubic feet Requires K-1647 Fast-Response Steam Generator Control Kit or K-1737 DTV II Steam Adapter Kit (sold separately)