29/04/2021
It’s important to recognise causes of pressure loss on a combination boiler or unvented heating system. The following are ways of identifying reasons for pressure loss:
1. Whilst there is a demand for heating, if the pressure gauge rises to 3 bar in a short period, the boiler will relieve water through a 15mm pipe run externally or internally into a tundish.
2. There could be a leak on any part of the heating circuit, whether at the boiler, radiators, radiator valves etc.
3. If the relief pipe is dripping before the boiler reaches 3 bar, would indicate a faulty pressure relief valve.
4. If there is NO sign of leaks anywhere on the heating circuit but you have pipes run in concrete or under floor, there is a chance, if pipe work isn’t protected, would mean pipe work deterioration/corrosion under concrete.
1&3 would normally be a cause of a faulty expansion vessel, which in most cases, can be rectified by pre-charging the vessel (pump up to 1 bar).
Any issues, please contact SDW Plumbing & Hesting on 07795681275, or visit web site at
SDW Plumbing and Heating Your local plumber and heating engineer. SDW Plumbing is your one shop for all your plumbing, heating and gas fitting needs. We provide comfort, economy and economical services in Llanelli, Skewen and Swansea. Plumbers Swansea SDW offers New Boilers, Boiler Installation, Plu...
