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.

need to replace steam boiler

nytech28 Member Posts: 67
edited September 2022 in Strictly Steam
hello ,I need to replace well mclain steam boiler ,i need some wiring diagram & boiler specs for replacment model any info would be appreciated , well mclain steam boiler model  EG-35-p1.


  • mattmia2
    mattmia2 Member Posts: 9,754
    You'll need to measure the radiators and figure out how much load is connected to it to size the replacement. is it leaking? It looks to be 50+ years old but doesn't look like a bad installation.
  • nytech28
    nytech28 Member Posts: 67
    edited September 2022
    boiler leaking, owner wants to repalce it,owner had no issues with boiler through the years ,just want to replace same model.
    EBEBRATT-Ed Member Posts: 15,635
    You should still measure the radiation to make sure the boiler is the right size. Make sure to follow the MFG. piping instructions and skimming instructions. And make sure the venting is up to snuff.

    You can find all the installation instructions and wiring instructions on line at Weil McLain or Supply House .com
  • 109A_5
    109A_5 Member Posts: 1,387
    Since there is a boiler in that series that is one size smaller an EDR survey should be done to best serve the customer. Their old boiler may have been cycling on pressure and they would never know. Your biggest problem presently may be to find one of the proper size (supply chain issues). Knowing what you actually need is a better position to be in. An EDR survey only needs to be done once, if the information is kept any future changes to the house can just easily modify the existing information.

    Wiring diagram;




    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • Jamie Hall
    Jamie Hall Member Posts: 23,458
    nytech28 said:

    boiler leaking, owner wants to repalce it,owner had no issues with boiler through the years ,just want to replace same model.

    Well, of course you can. I can replace someone's 2001 Toyota with a nice used one, too. Will it work? Sure. Is it the professional thing to do? No. Is it the best service for your consumer? No. Will it come back to bite you? Probably not. You can do it right -- see the guys above -- or you can do it the easy way. Your call.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • pecmsg
    pecmsg Member Posts: 4,895
    Show this uninformed homeowner that YOU are a professional! Measuer the radiators and get a properly sized boiler.
    Age may have killed that boiler, but excessive water usage could have also! Excessive short cycling, excessive pressures.
  • nytech28
    nytech28 Member Posts: 67
    i.ll consider putting on perposal for the home owner that system needs to properly be evaluated.I do consider other techs comments & appreciate the manuals. God bless guys