... .over-heat protection 3.automatic 7 years factory high efficient steam generating machine Power: 4KW,6KW,7.5KW,9KW,10.5KW,12KW ... steel tank, copper inlet and outlet, copper handle with zinc 4 - 18kW power options, in-shower thermostatic control, stainless steel ... Control TypeFAN-404220/38018.2/6.11/32.5-53*4/5*1.5Control inside/outsideFAN-606220/38027.1/9.11 ... 4FAN-12012220/38054.5/18.21/314-173*10/5*4