Can anyone advise me on corgi regs. I have just had the new boiler fitted to the excisting pipe work. And everything is working perfectly. However I have just been told to be able to register it with Corgi the gas supply should be 25mm pipe not 22mm. Ijust don,t understand it for 3mm differance.

Jeff, December 2008

Corgi reg's don't state a pipe size as such, but do state a pipe size that can deliver the correct amount of gas per hour for your boilers needs.. most worcesters have a 22mm inlet tapping and state the supply pipe should not be less than this... but 25mm? thats generally under ground MDPE water pipe... maybe you meant 28mm?

ian, July 2009