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Thanks for the replys - just wanted to check - (makes sense when I thought about it - same as volt drop!) Ollski, just out of interest, do they block on the Primary (heating) or Secondary (hot water) Side of the HW Heat Exchanger ? Thanks Dave

Hi All, Do all combi boilers have to be fed by a 22mm Gas supply ? Sorry if this seems a stupid question, but I 've had a quote to replace my existing Conventional Back Boiler with either a Vaillant EcoMax 828E or a Glow-Worm 30cxi, and been quoted to re-run 22mm from meter to new boiler...