People often get confused by the term Gravity hot water system.
Describe your system and its pipe work and any controls fitted to it for a more accurate answer.
Its 2 28mm pipes out left hand side of boiler goin to cylinder , and two 22 on right hand side with pump , and the 28 pipework has a 2 port valve and that's all
Thats gravity for sure. The 2 port valve on the 28mm makes it a C plan.
System needs conversion to fully pumped to accommodate a new boiler.
Not a difficult job to do.
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