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Hi all. My builder has rerouted my domestic hot water pipes and now we cannot get the primary flow and return free of air. Interestingly He has joined both the cold feed and the vent pipe together comining into the boiler flow pipe. All schematics I can find show the cold feed coming into the...

My six bed house (lotsa kids) has a seperate CH bolier (about 60k) with 28mm flow pipes splitting into 2x22mm one feeding downstairs the other upstairs. My builder is doing some structural work which meant him moving the boiler and has made it a pressurised system. Because of piping runs he has...