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Paul SPaul S Posts: 535Member
When using a regular atmospheric hot water boiler with primary/secondary do I control the primary pump? System is going to have four high temp baseboard zones.....and three radiant zones with 3 way mixing valves.....should that I use a relay to turn primary pump on whenever any zone call for heat or outdoor reset Paul s


  • The easiest way

    is to wire it off the boiler if it has a pump relay.

    If not, create you're own pump relay off the end switches as you say.
    Often wrong, never in doubt.
  • Paul SPaul S Posts: 535Member

    Do you recommend one pipe primary secondary or two pipe on a residential home? Heat loss of home about 160000btuh's...thanks Paul s
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