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DHW recirculation

I would like to get some opinions on the best way of controling a domestic hot water return pump in an apartment building. Obviously constant circulation is not the right way, I know the Buderus wall hung boilers are preset to run at 3 minutes every hour, I'm not sure if thats enough, the only other way I know is with an aquastat strapped to the pipe, that will run the pump if it goes below 110 - or whatever you set it at.



  • Mark Eatherton
    Mark Eatherton Member Posts: 5,853
    Time and Temperature...

    A programmable timer AND the aquastat will set you up.

    Set the timer to run between 5 AM and 10 PM. If during that time, the water comes back adequately hot, then the aquastat shuts it down.

    If it is between 10 PM and 5 Am, then the pump stays off.


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