Been or this job 7 days. Just filled and fired up 2 x 40cdi greenstar regulars. Gas rated them together - getting 72kW @ max. However only getting 5mb working pressure at either boiler. 21mb at meter. Spoke to Worcester and Gas Safe and they're as baffled as I am (although Gas Safe tech said they'll get back to me). Cannot get my head around the gas rate being so high when wp so far off. Anyone any ideas?