We are upgrading our heating system in a 1960s 5 bed house from a gravity fed system to a pressurised cylinder system. We have received different advice regarding the need to replace all the pipes with one heating engineer saying we do (in case the current pipes can't accommodate the new system) and another saying we don't (saying the new system will challenge the existing pipe work but the current system has a level of pressure on it suggestive of easily being able to handle a sealed / pressurised system perfectly adequately).
I'm thoroughly confused and wonder whether anyone on here has any thoughts?
Thanks
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