I have a (great?) 18hp Honda 4,500 psi(never actually seen 4,500 while using it though) power washer and have been told by two people now that without the hot water option, they wouldn't even own one. Question, is this a possible add on? Also, is the hot water added before or after the high pressure pump? My hose says max temp 230F, does anyone know the actual temperature the hot water washers usually get? I've always been content by the job my washer does, but now the hot water guys have sparked my interest.