The expansion vessel is a closed system that connects to the boiler’s water circuit. The inside contains a flexible bladder (diaphragm) that divides into two compartments. On one side of the expansion vessel, water from the central heating fills the compartment. On the other side, gas accumulates. This is usually nitrogen in combi boilers.. If any of these components are seriously damaged, your boiler repair costs will skyrocket, and a full-on boiler replacement may be worth it. For example, a heat exchanger on a boiler may cost £500 or more, while an expansion vessel replacement may cost you over £300 — hardly a worthwhile investment for an old boiler that’s out of warranty.
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Expansion vessel replacement on Worcester Bosch Greenstar boiler. hi there, our boiler pressure was going between 3 and 4 so we called an engineer round who said this was probably caused by a problem with the expansion vessel. He removed it, showed that it was leaking and replaced with a new one. When I was researching high boiler pressure.. Muzungu said: ↑. No need for a new boiler, as per nohmtogoto get an external expansion tank fitted if the integral one has gone and that is the only fault. Tank kit say £50 and can be fitted pretty easily with basic skill set, or perhaps a couple of hours or so for a pro although likely will charge minimum half days work.
