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I am surprised that several RGIs here are not apparently understanding the requirements or their responsibilities.
The gas supplier should supply 21 mB =/- 2 mB atb the outlet of the meter on full load ( of the meter rather than the boiler fitted. )
We are taught and assessed on pipe sizing when taking the qualifications which we need to be registered so I would say he has no excuse!
Tony
Tut tut, are you sure your right Tony.
Have a read of BS6400.
21+-2 at the ECV could result 14WP at the boiler even when correctly sized.