My Corgi fitter has just fitted a Worcester Bosch Greenstar 42CDI. It is supposed to have a working pressure of 18mb minimum.
Initially, the standing pressure at the boiler was 20mb which dropped to 14mb on test.
The fitter fitted a more direct (4 bends max wide bore) pipe from the meter to the boiler which produced a standing pressure at the boiler of 28mb!
On testing the working pressure was 16-17mb!
Just what has one to do to get this boiler to work within the manufacturer's spec?