We have a glow-worm combi boiler in the kitchen, which is used to heat the
water and supply the radiators when heating is required.
Upstairs in the 2nd bedroom there is a cold water tank and hot water tank
with an electric emersion heater.(never used).
Today on returning home from work, the hot water has come on via the combi
boiler(no heating on) but the radiators downstairs were all red hot, even
though the timer was set to hot water only and the thermostat in the hallway
was on minimum.
have done a Google and the general consensus seems to be the gravity return
If this is the culprit, where is it located and is it easily sorted..
Thanks for you help