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Agreed - the radiator & domestic hot water are separate. But the cylinder is full of domestic hot water, which we do not always use fully, and so my idea was to keep pumping the radiator water around the system for say another 30mins, and keep it warm from the cylinder. Maybe I am wrong -...

Thanks for the reply...what do you think of this idea... I can't work out how to wire the overrun, so I was thinking of having a manual over-run...to install a swith to run the pump & open the zone valve (but not call for heat to the boiler) - and so the radiators continue to have hot water...

Great - thank you for your help Pete

Hi - does anyone have the instructions for the Glowworm fuelsaver - specfically about the over-run to share please ? I recently replaced the cylinder, zone valve, pump & controller - but I know I didn't include the over-run (because I didn't know how to wire it) If you have the...