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Mixing Circulators and Zone Valves - Check Valve Locations

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peedee360
peedee360 Member Posts: 10
When using both zone valves AND a circulator where do the check valves go? For instance my setup would be 1 Circulator for the Indirect and 1 circulator going to 2 zone valves for my two heating zones. My assumption is that the IHW circulator keeps its built in check valve and I am good to go. Do I need any check valves on the return side?

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  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,527
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    Normally the check valves in the circulators are all you need
    peedee360
  • peedee360
    peedee360 Member Posts: 10
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    Thank you! Should I be concerned about the water moving through the indirect when the pump is off? Or is that a rare situation that can be addressed if needed?