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  1. Z

    Expansion vessel in gravity fed central heating system

    Great stuff, thanks again Tony... Mark
  2. Z

    Expansion vessel in gravity fed central heating system

    Thanks for the reply Tony, that is what I will do. Re. the EXV pressure; the expansion vessel is right next to the header tank in the attic so, correct me if I am wrong but wouldn't there be very little water pressure at the expansion vessel when cold. Maybe a few inches of water. Or should I...
  3. Z

    Expansion vessel in gravity fed central heating system

    Hi guys, I have an unusual heating system I have inherited and I am looking for advice. Below (and attached) is a diagram of the system. It is gravity fed but at some point an expansion vessel and non-return valve have been added converting it into (what I would call) a semi-sealed system. I...
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