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Zone valves and shutoffs and boiler drain valve placement

jwojojwojo Member Posts: 1
Hello, I ihave a hot water boiler with two zones. I recently am replacing the boiler with a new one. I was wondering what the proper placement for the boiler drain valves and ball valves are cooresponding to the zone valves. My zone valves are on the feed side, my circulating pump is on the return side. The old boiler had zone valve then ball valve then drain valve in that order going up on the feed pipe. Is that correct??


  • Jamie HallJamie Hall Member Posts: 13,118
    There are lots of acceptable ways to pipe things. By far the most important is that the pump must be just down stream from the expansion tank, pumping away from it. There can be a ball valve in between, but nothing else.
    Br. Jamie, osb

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
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