Many thanks to all of you who have replied to my post.
It has confirmed that my calculations although not exactly correct do show that a 28mm pipe should have been used and the 22mm pipe needs to be replaced what ever it may cost.
The Gas Safe fitter concerned is quite a young chap I...
Hi
We are in the middle of an extensive kitchen refurbishment which included replacing an old boiler with a new Vaillant eco-tec 831 boiler in a new location. As this involved replacing most of the existing gas pipe we decided replace and hide the gas pipe in the hall way as well because it...