plumbing

[fairfield]

HI. I have a ducted warm air heating system. The hot water tank is an indirect tank. I have a small expansion tank in the loft which keeps overflowing it is not the water inlet valve as i shut off the supply and it still over flows the only way it can fill up is from my main hot water cylinder have I got a pressure problem.

[The Builder]

......sorry FF..........but I don't understand a word of this :o)

Your warm air system - is it electric, or perhaps a boiler with some kind of heat exchanger..........

Your small expansion tank should only be connected to the indirect primaries that flow through your cylinder..........if the supply is cut off, then it can only fill sort of backwards from the boiler primaries..............(still with me?)

Do you have a bigger tank in the roof that supplies the HW cylinder?
Need more info I'm afraid

[gucciman]

i dont understand your question either. I'm presuming that your system is a gas fired warm air unit with a fan which blows hot air around the house, such as a johnson and starley model. and does it have a hot water circulator next to the main heating burner?

i would have expected a hot water cylinder and a header tank to fill it, i cant understand what your saying about having an indirect hot water tank and a small expansion tank.
and what do you mean by you can only fill up from your hot water cylinder? fill what up?