pump head pressure flow

Hi my really old large house used to be a real mess in terms of several old heating systems that were cobbled together and extensions to it. Not to mentions redundant pipework from Back boilers and a Rayburn/Aga style device in the kitchen. Now - I have the original gravity fed Potterton...

Hi all. I've moved into a 3-storey house, with the highest radiator 8m above the boilers. There are 30 radiators including towel rails, served by two 28kW Vaillant 628e boilers connected in parallel, i.e. each across the return to the flow. They're system boilers each with a standard pump that...