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Query on gas pipe sizing

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Frenchdc

Hi to all,
just noticed on my 25 kW combo boiler Worcester greenstar si compact that the gas input pipe is 22mm from the meter changing to 15mm pipe and then back to 22mm about 1 metre from boiler. Is that correct as it seems a bit odd?

thanks
fdc
 
Depends on distances involved but doesn't sound right when was it fitted
 
How long ago was it fitted?
You could get a gas safe engineer to gas rate the boiler to put your mind at ease, or to confirm its not correct.
 
Best thing to do would be to call in a gsr to check the working pressure.
 
Boiler installed in 2013. Boiler is in the garage and is only 3 metres from gas meter.
15mm pipe is teed off 22mm pipe after 1 foot from meter then changed again to 22mm just before entering boiler
 
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