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Thanks for your replies! My utility room contains the 4 pipes as previously described. Was hoping I'd be able to convert without running new pipes but it seems that may not be possible. I've knocked up another pic. I think this takes into account your recommendations and would mean...

Hi, Recently moved house and the oil boiler has packed in already. Current system is a gravity system, so 4 pipes from boiler (feed and return to tank and feed and return to radiators). I'm planning to get a condensing oil boiler to replace it but need to modify the pipework to make it...