Gofo, if he has 21mb working pressure at meter it cant be the regulator...the regulator is upstream of the meter test nipple.
Assuming hes not taking a burner pressure reading its either a blockage or GV to blame
Theres a few different types that are grey...you would have to read the side of it or look at a cross section to confirm. Seen a couple of installs in non barrier that have sludged up massivly supposedly down to the non barrier ingressing air
I should probably read the thread first. Most of what i wrote has been said already!
The domestic heating design guide has a good bit on sizing pumps and working out your flow rates etc. I think its published by the CIBSE...the orange book. Worth a read if youve ever got a largish heating...
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