R
Royellis
I've got a thermal store heating system. It's unpressurised and the water is heated by LPG. There is a feed tank sitting on top of the thermal store - well, integral with it really - and this is fed via a ball valve. Incorporated into the cold water pipe leading to the feed tank there is a Zilmet expansion vessel, model number Z50. It's about 4" long and about 3" in diameter. It's pressured via a schrader-type valve. This valve has malfunctioned and my only way forward is to replace the expansion vessel. But, and this is my question, is this expansion vessel serving any useful purpose in my unpressurised system? If it isn't, there is no point in replacing it and I'll simply remove it. I hope that someone can advise me.
Royellis
Royellis