My heating system boils up into the header tank from the boiler when the
domestic hot water , has heated up.This is since I have changed the program
for the water to be heated before the Central Heating now the weather is better ( Previously switched
on together) I think maybe the Drayton hot waterTank thermostat HT S 3 may be at
fault, or what else may cause this? The boiler is a Warmflow oil Cabinpak and the pipes run into my loft to distribute around the bungalowThere are two electric valves in the system also in the loft.Not a sealed system. Any ideas appreciated Regards E
domestic hot water , has heated up.This is since I have changed the program
for the water to be heated before the Central Heating now the weather is better ( Previously switched
on together) I think maybe the Drayton hot waterTank thermostat HT S 3 may be at
fault, or what else may cause this? The boiler is a Warmflow oil Cabinpak and the pipes run into my loft to distribute around the bungalowThere are two electric valves in the system also in the loft.Not a sealed system. Any ideas appreciated Regards E