How do increase the water preesure in the central heating heating system. I understand that i have to turn a valve with a srewdriver but which valve is it. I have combi Valiant boiler about 6 years old.
A picture of what one looks like would be handy.... if not then a description and location of it hopefully should suffice.
Thanx
A picture of what one looks like would be handy.... if not then a description and location of it hopefully should suffice.
Thanx