if your hot water side is fed of gravity this will always be on if your boiler is turnd on! as for 2 pumps i dont know why you need 2 because if your water is heated by gravity therfore not needing a pump. you shouldnt need 2 pumps for the heating side unless you live in a castle?
if you need any more info mail me
ian
coxheadj@aol.com
ian
February 2005
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