Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Internal Boiler Circulator - primary / secondary piping

Options
mtbllp
mtbllp Member Posts: 1
Weil McLane GV-5, Series 1 boiler has an internal circulator pump. I am setting up primary secondary piping. Zones include air handler, baseboards and indirect water heating.

Is the internal circulator pump all that is necessary for teh primary loop? Or, is a second external circulator necessary?

Thanks

Comments

  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,102
    edited December 2021
    Options
    The boiler pump will take care of the primary. For your secondary circuit, if you are zoning with zone valves, a second pump is necessary. If you are zoning with pumps, there will be one pump per zone.



    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • hot_rod
    hot_rod Member Posts: 22,467
    Options
    Is it a GV 90 plus-5? The manual shows how much pump capacity you have to work with.

    if it is an older GV, some of those had a circulator inside for return temperature protection, and still requires a system circ.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream