Call us : Phone 01977 554775

Visa Card Mastercard Maestro Card Visa Electron PayPal

Main Expansion vessels

This part is in the boiler to ensure that the pressure within the boiler operates within safe parameters normally 1 - 2.5 bar. The expansion vessel should be half full of air and half full of water both separated by a rubber diaphragm. The common problem customers encounter is when air in the expansion vessel escapes over time and allows the boiler to run at higher pressures such as 3 bar. At this point a safety valve operates (pressure release valve / prv) ensuring the boiler
can’t go above this pre-set safety pressure.

Page 1 of 2

Search By Part Number



Click here to view our feedback on Trust Pilot

Click here to view our feedback on Google Reviews