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Looking for pump info on a old B&G circulator

Kevin_71 Member Posts: 6
Hi! I was just trying to cross reference my ancient B&G circ pump that I used to have on my heating system: Info is as follows: "P-4-132-5-5", "125-1 1/4" "DD" . Some years ago I replaced same with a Taco cartridge circ pump, and I assume I cross referenced same correctly, but then again it's never safe to assume is it? I'm "second guessing" myself because now I have an all new boiler (Buderus) with a nice Grundfos circ pump on same (pumping away as Mr. Holohan taught us some years ago) and wanted to be sure all is up to specs...thanks for any info!


  • deadmansghost
    deadmansghost Member Posts: 32
    That is an old 100 series bell and gossett circ. 1/12 HP "DD" is date code . approx. late 60`s
  • Ironman
    Ironman Member Posts: 7,352
    ''Specs" would come from determining what size circ was necessary for a particular circuit or system, not simply matching the old series 100. It may have been over-sized. Most were.

    If you're getting good heat in all areas, then the present circ is probably sufficient. Most hydronic systems are over-pumped.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
    HEATON Member Posts: 117