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Recent content by nigelengineer

  1. N

    Secondary return

    the return pump should run 24-7 the hole point of a return is there is hot water within seconds this elevates the problem of Legionella, the water is always above 60deg C. as for the return pipe if you run 22 supply 9 out of 10 times will be 15mm there is a calculation you can do but it will end...
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