Would that really matter though as long as the draw off was not enough to
significantly affect the burner in the boiler?
I'm sure in a friends house you can hear the boiler rumble alter when they
start cooking on the gas cooker sometimes.
Brian

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"Andy Burns" wrote in message
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Chris French wrote:

I set the output pressure on gas valave (abiout 12 mbar), and while I was
at it
checked the supply pressure on the valve as well.

It was about 14-15 mbar. So somewhat low..
I checked the pressure at the meter, it was fine, 21 mb.

21mbar is spot on, but maximum permitted drop in pipework to boiler is
1mbar