Years before there was a oil installs registration scheme I Installed secondhand AGA and Rayburn cookers, Some of which heated the hot water alongside wood burning stoves and central heating boilers.
To interconnect the various water heater flows and returns required the neutral point in the pipework to be fixed by using a Dunsley Baker neutraliser
Generally the water will flow past the neutral point in closed loop heating water pipework, unless there is a restriction or airlock, but fitting a bigger pump may not resolve issues with badly installed plumbing and a positive head shower pump may also not resolve the issues with badly installed plumbing as it may not even turn itself on, at least a negative head pump should turn itself on.
Years before there was a oil installs registration scheme I Installed secondhand AGA and Rayburn cookers, Some of which heated the hot water alongside wood burning stoves and central heating boilers.
To interconnect the various water heater flows and returns required the neutral point in the pipework to be fixed by using a Dunsley Baker neutraliser
Generally the water will flow past the neutral point in closed loop heating water pipework, unless there is a restriction or airlock, but fitting a bigger pump may not resolve issues with badly installed plumbing and a positive head shower pump may also not resolve the issues with badly installed plumbing as it may not even turn itself on, at least a negative head pump should turn itself on.
