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Can anyone identify this circulating pump?

Norm Harvey
Norm Harvey Member Posts: 684
That looks like a pretty good distance between the circulator flanges and with the threaded pipe, it would be pretty simple to repipe that section to fit a more modern and available circulator.

If you give us some info on what that circulator serves, Im sure we could adequately size a modern one for you.

That pipe is 1 1/4 ? The picture doesnt do the pipe justice.

How high are the radiant panels from the circulator?
What is the radiant tubing size?
How much tubing is there, and what is the longest length of tubing?

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  • reevesjo
    reevesjo Member Posts: 3
    Identify circulating pump

    I am a newbie here, but I am hoping someone might be able to help. This gas fired, Sears Roebuck hot water boiler, radiant heating (copper coils in the ceiling) system was installed by my Dad about 50 years ago. My son lives in the house now and I am getting nervous about not having a spare circuating pump. I can't find any identifying labels on the pump, except a casting number 525N. I would be interested in repair kits or a direct replacement that would fit the 9" flange to flange dimension. If I need to buy a different brand, I still don't know the gpm rating of this one. The electric motor is a GE 1/8hp, 1750 rpm. Here are three photos.

    side view

    backside view

    this is a front view of a second pump without motor that was in the system but not used. I rotated the shaft a few degrees to see if it was still free. Water started leaking around the shaft so I rotated the shaft a few degrees back and forth to stop the leak. So, it is not a good candidate for the replacement pump that I am asking for.

    I haven't provided every gritty detail of the system, but I am ready for questions. The pipe size is 1 1/4. A Bell & Gossett rep said a 24 gpm (PR 102206) replacement was available that would "probably" do the job, but it is $574. I am looking for a better choice. I can adjust the pipe lengths to accomodate a different flange to flange dimension if necessary.
    Thanks to anyone who can help, Joe
  • reevesjo
    reevesjo Member Posts: 3
    Circulating pump identity

    Thanks Norm for your reply,
    (That pipe is 1 1/4 ? The picture doesnt do the pipe justice.)
    Two photos, 3.jpg and 2.jpg are of the pump in service and it is 1 1/4" pipe. 1.jpg is a photo of another pump and circuit that was never used, and it is 1" pipe.

    (How high are the radiant panels from the circulator?)
    About 14'. The boiler is in the basement of a one story home. The copper tubing is in the ceiling of the living area on the first floor.

    (What is the radiant tubing size?) 1/2" copper

    (How much tubing is there?) This is hard for me. I am guessing about 1400'. My Dad installed this 50 years ago when I was in the Army, so I was not present. I think the copper lines average about 12" apart and the living area is about 1450 sq ft. I think there are 5 or 6 different loops (zones) that are fed from a manifold with adjustable flow control valves.

    (and what is the longest length of tubing?) I can't even guess on this one.

    The circulating pump is in the return line a short distance from the boiler.

    The flange to flange distance of the present pump is 9.00". There is room to do some repiping to alter this spacing. This system has been working almost flawlessly for 50 years. I replaced the electric motor and a couple of thermocouples over the last 20 years. Also, a real plus: there is a natural gas well on the property that has never been touched in my 72 years.

    Thanks again for any help, Joe
  • Ron Gillen_2
    Ron Gillen_2 Member Posts: 2
    Grandpa was quite a guy

    Sorry I don't want to offer advise, just want to comment on the install. 12" centers, 250 - 300 foot loops, balancing valves on the header, fifty years ago. A lot of guys can't put together a system like that today. Pretty amazing.
  • reevesjo
    reevesjo Member Posts: 3
    Grandpa was quite a guy

    Hi Ron,
    You have that right! I can fix most things that break around the neighborhood. When people ask, "Where did you learn that?". My reply is always, "Thank my Dad". In his later years, he had a tree that was leaning toward his garage. When I finally saw it, he had taken a string with a big nut tied to the end and threw it up over a branch and then pulled a small rope up with the string. Then a cable up with the small rope and hooked it to his chain fall on another tree. I took my chain saw down to his house and it fell perfectly between some other stuff without incident. I could go on and on. Quite a guy is right.
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