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thanks for your reply,would you know what sort of temp loss i would have between flow and return on plate heat exchanger?and what temp loss would indicate scaled dhw heat exchanger.

biasi parva 24s overheating in hot water only heating ok.

when wiring up a new electric oven which is on its own MCB (which was isolated), i found that when i cut into the cable at the length i wanted, it tripped out the RCD. when continuity tested with test meter, i found continuity between earth and neutral. Is this what you would expect to find...