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Gravity flow through circ pump?

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Scott Toenniessen_2
Scott Toenniessen_2 Member Posts: 14
in THE MAIN WALL
Is there any need to add a zone valve to prevent gravity flow through a circulator pump on a hot start (tankless coil in use) boiler? The system I thinking of was originally gravity - now forced - so much of the piping is designed for and probably encouraging gravity flow. It is one zone so no zone valves.

- Scott

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  • Maine Ken
    Maine Ken Member Posts: 531
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    You need a flow check, or IFC pump.
  • Eric_10
    Eric_10 Member Posts: 17
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    gravity flow

    been there,
    you do need a flow check on the main or your customer will call about 6 hrs after you leave complaining the heat will not shut off
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