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how to size an existing H B Smith series 44 boiler without tag

Tlarsen Member Posts: 1
I have an old H B Smith series 44 boiler that i need to replace and i have no way to size it. the only information i have is the MBH rating of the gun. Does anyone know how i can size this boiler for replacement?


  • KC_Jones
    KC_Jones Member Posts: 5,742
    If it's hot water it's sized by the heat loss of the building, if it's steam it's sized by the EDR of the emitters.
    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
    Boiler pictures updated 2/21/15
  • Jamie Hall
    Jamie Hall Member Posts: 23,454
    ... and not by the size of the old boiler, in either case!
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    John Mills_5newagedawn
    EBEBRATT-Ed Member Posts: 15,635
    What @Jamie Hall and @KC_Jones said is correct. I used to have all the old smith boiler books and had the #44 charts, unfortunately the book got moldy in the celler so I tossed it.

    I am sure if you call Smith In Westfield, MA they can help you. Called Mestek now
  • newagedawn
    newagedawn Member Posts: 586
    best way is to do a heat load for your building
    "The bitter taste of a poor install lasts far longer than the JOY of the lowest price"