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The requirements for the diameter of the gas pipe?

The gas pipe connected to my combi boiler VOKERA linea is 15 mm, If I want to replace for a new boiler is it any options , which would satisfy the latest regulations? Ideally I wouldn't like to change the gas pipes,but only to replace a boiler.
damadaeva, February 2008
It is normal for the last few feet to be 15mm.
However, the general run of pipe from the gas meter will be 22mm unless it is a long run and there the answer will depend on the distance.

Perry525, February 2008
you may have to if your running a cooker, boiler. length of run from the meter etc. most boilers now require a 22mm pipe.

sonray heating., February 2008
link Click here to see other fixes for Vokera.