Can I run my boiler without the CH pump for Hot Water only operation?

T,

I have just had the motorised valve replaced and it now works correctly. It shuts off the flow to the rads when HW only is selected which is what I want. Heating operation is fine, my concern (over the summer particularly) is for HW only operation.

As there is currently no cylinder thermostat, the pump is running all the time that the HW is selected on the timer, even when the water in the cylinder is up to temperature. The boiler then only fires up if it detects a drop in temp of the circulating water.

In an ideal system, I would fit a cylinder thermostat and wire it back to the control pannel so that it can electrically switch off the boiler until it detects a drop in temp. This is clearly the most efficient solution. It is this connection that would be a pain (I don't want to re-decorate just yet!).

My question is can I switch off the pump if the thermostat is recording the appropriate water temperature. And will that safely prevent the boiler firing up?

Stephen Clark
March 2008

Is your motorized vavle not allowing you to select between HW and CH? or is it there to zone the house?

T
March 2008

Water MUST circulate through your boiler. end of.

T
March 2008