Expansion tank bar pressure

Reddevilman

Can someone tell me what pressure the expansion tank should be, had new one fitted by landlord and its sitting at 3 and red arrow near 4

corkgsxr

Take a pict.

Is it the boiler pressure your looking at?

Expansion vessels are to 0.8 to a bar depending on boiler.

Reddevilman

Its the little red tank beside the hot water cylinder,the old one was leaking so the landlord replaced it,how do i add pics

DGOBS

It would have always equalised expansion pressure to system pressure.

If there is a gauge there, it is WATER pressure, and should be between 0.5-1.5 (when cold) bar depending on who may floors your home has (0.5 per floor) and shouldn't really pass 2.5 bar (when fully hot)

At 3bar the safety valve should lift to relieve water pressure, if your is constantly at this level you expansion vessel needs attention (or maybe your filling valve has been left open) you can only test the expansion vessel pressure when there is no water pressure pushing against it (if not your only measuring water pressure, not air pressure)

Reddevilman

The house is a rented bungalow with attic conversion and the hot water cylinder dual stat is just hanging from the tank can someone tell me how to post pics please