Hi, I have a Stelrad Ideal Wlx RS Series boiler (unfortunately I do not know the exact model). This boiler is quite old but extremely reliable until now. When the heating is set to come on the system provides hot water. If the system is set to just Hot Water (as required through the summer) then there is nothing more than lukewarm water.
We have had both the thermocouple and gas valve replaced last year for other reasons if this helps.
We have had both the thermocouple and gas valve replaced last year for other reasons if this helps.