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New install questions

tom15
tom15 Member Posts: 2
in Radiant Heating

I am replacing an old gas boiler. I had a few quotes and the final quote offered me two options. A Williamson or a Weil MacLain.

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I have attached images of the specs on both from the quote as well as the existing spec on the old boiler. ( the plate on the boiler) My questions are the new boilers adequate for sizing or oversized . I have 12 old cast iron finned radiators .most are 3 ft with one 6 ft. Which would you recommend the Williamson or Weil? The old system was gravity and the new will have a circulator pump. Sorry about the images not formatting in a row. Thank you for any advice on this .

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Comments

  • Jamie Hall
    Jamie Hall Member Posts: 24,727

    Did anyone do a heat loss analysis of the house? What did it say?

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • pecmsg
    pecmsg Member Posts: 5,282
    edited August 2

    Rearly is an old boiler sized properly.
    get a manual “J” load loss calculation done.

    125,000 is a big boiler.

  • tom15
    tom15 Member Posts: 2
    https://forum.heatinghelp.com/discussion/comment/1807343#Comment_1807343

    No they did not. I will ask them about an analysis

  • Hot_water_fan
    Hot_water_fan Member Posts: 2,040

    how much gas did you use the previous year?

  • STEAM DOCTOR
    STEAM DOCTOR Member Posts: 2,204

    Old boiler size is irrelevant. Unless it was installed by Dan Holohan and no changes where made to house since the original installation.

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