Thanks, but I've done that and we have connected the heater exactly as they say. Only thing i can think of is we dont have enough water pressure, the manual says from 0.2bar to 10bar, we have 1.5 bar, so how many bar do i need for the water to be hot? i think the prob is between the outside supply and the connection to the heater, best thing to do is replace/clean pipes. :-?