hi
its on a unvented system
unfortunatly we have a pressure reduceing valve on main were it splits into the four zones of the house
thanks for that otherwise
pete
new house we purchased the hot water comming out cold
i diagnosed it to the shower mixers ( i b is the makers italian)
any idea is it the non return valve on the mixer letting bye or the thermostatic cartridge broken
there is three showers broken and all mixers enclosed behind sheets of...