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Fewer Circulators with 3-way diverter valve

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optimist55116
optimist55116 Member Posts: 12
in Radiant Heating
I am adding an indirect water heater to my hydronic heating system and updating the design a little. In the process, I am trying to reduce the number of circulators.  In the typical drawings of a system with a non-condensing boiler, a buffer tank, and an indirect, each has its own circulator pump.  Couldn't  I eliminate two of these pumps with a 3-way mixing/diverter valve (motorized).  Assume that the indirect gets the full attention of the boiler when calling. The following is a sketch of what I am thinking (with many non-relevant components not drawn here):



    

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  • hot_rod
    hot_rod Member Posts: 22,143
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    Sure

    As long as has adequate Cv for the load. What size boiler?
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • optimist55116
    optimist55116 Member Posts: 12
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    Thanks and ...

    Cv is around 20 and boiler takes in 130K (so about 100K) out.  I
  • hot_rod
    hot_rod Member Posts: 22,143
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    The few I have done

    We're 80K boilers. I put the zone valve on the return piping. Cooler temperature and less delta P. I used a common paddle style, spring return ZV with a 7.5 Cv 1" size
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
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