First post since intro!
Worcester 28cdi in property when we bought. Worcester engineer when servicing says should have a mini expansion vessel in cold supply because a water meter is fitted. Boiler has worked with very few problems over the years so why is mini expansion vessel needed now? Always had a water meter and it is approx. 30 meters from boiler position.
Retired plumber friend says not needed because that length supply pipe gives plenty of expansion. (I understand the idea of hot water pushing back into cold supply)
However, since a liquid is not compressible how would it allow expansion.
Don't want to spend money unnecessarily so am asking for guidance
Worcester 28cdi in property when we bought. Worcester engineer when servicing says should have a mini expansion vessel in cold supply because a water meter is fitted. Boiler has worked with very few problems over the years so why is mini expansion vessel needed now? Always had a water meter and it is approx. 30 meters from boiler position.
Retired plumber friend says not needed because that length supply pipe gives plenty of expansion. (I understand the idea of hot water pushing back into cold supply)
However, since a liquid is not compressible how would it allow expansion.
Don't want to spend money unnecessarily so am asking for guidance