As many people with real experince have said, the range rating I posted was from a BG 330 boiler (GW 30 hxi rebadged with a different display aka ecomax pro 28). The boiler is supplied at 30 Kw and BG engineers are trained to 'adjust' it as required. As this is supposed to be BG/GW restricted info I doubt you will find it on the interweb!
Here is the proof you wanted -NOTE not the 37hxi; different mixing plate and gas valve set up.
Here is the proof you wanted -NOTE not the 37hxi; different mixing plate and gas valve set up.