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Why does it only go empty in the summer? and where does the hot water go after it leaves the water tank? it surely doesnt come back into the tank while its boiling hot?

I have an old central heating system where there is a water tank in the loft. That presumably feeds the whole system. However, every year after summer, I have to go up into the loft to refill the tank because it has become empty. I push the valve and water slowly trickles out until it stops by...

I bled air from a radiator only a week ago because the top half was cold and already it is becoming cold again at the top. Why does air keep building up?

Could the boiler thermostat be to blame then? It could lose its calibration after many years and that might cause the boiler to switch on and off frequently.

The house does warm up and the radiators are very warm. It's just odd that it's switching off/on. How can the pump circulate hot water during the time the boiler flame has gone off? thanks.

Yes I have also wondered that there might not be anything wrong. But why is the flame constantly switching on and off even though the room thermostat is still on and that temperature hasn't been reached? My understanding is that the flame has to be on all the time until the room thermostat...

Hi, We have a Glow worm 'ultimate' central heating boiler. The problem is it switches on and the flame comes on, the pump starts, and the radiators become very warm. Then after say 30 minutes, the flame goes out (but the pump continues to run.) This on and off behaviour carries on even though...