ravenheat rsf 820/20t hot water combi?

I have one of these boilers. It's never been too good at delivering hot water at high flow rate's. Kitchen sink and basin taps are fine but for the bath i can't turn tap on full to get a decent temp for a bath. Just have to turn the tap down untill the right temp is achieved! If this sound the same as yours you could try turning the isolation valve to the hot tap on the bath down so when the bath tap is on full the water is hot enough although sometime this can make alot of noise when running the tap.

sed
May 2008

assume you mean the dhw, and not the ch?
when you say not properly, too hot? too cold? reduced flow?
hot then cold then hot? only luke warm?

this is important as it can indicate different problems, please give us as much detail as you can.....

T
May 2008