I realise that mains water is needed to increase pressure, but I can't see any valves or connections where i can loop a pipe in. The mains comes in the top to a service valve then to a flow switch and then into the water tank. Below there is a pipe going to a Tee to the pump and pressure gauge, no obvious means of adding the mains?

Tony, September 2008

is it definately sealed system, a lot of worcester boilers were installed with a header tank which barely reads on the pressure guage.

see if you have a piece of copper pipe outside below flue, if not it may be a open system

iain, September 2008