problem with over pumping All aspects of plumbing questions and answers, help, tips and information

[barry diebelius]

i have a problem with pumping over in the header tank. i cannot raise the tank any higher as it is already at the top of the rafters,the boiler and the pump are located in the loft as well.

[marrtin]

Move the cold feeder pipe to a position closer to the expansion pipe (within a foot). The only reason you get an overflow or air sucked in is if there is a pressure differential between the two. Putting them closer removes the possibility of this occurring.