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Old H. B. Smith boiler

B. NorianB. Norian Posts: 11Member
we have a (school) client with a 60s vintage H.B. Smith 340 Mills Series 34, 12 section boiler, gas-fired, hydronic, from which the capacity plate has been removed. Anyone out there with yellowed catalogs?


  • TedTed Posts: 40Member
    must be a 350 Mills

    Bruce, It must be a 350 Mills which w/ 12 sections has a IBR gross output of 2,240 MBH.
  • GuyGuy Posts: 450Member

    The net output of that boiler is 1,109,600 BTUs. A Smith 28HE -6 setion would match the BTU load nearly identically, but if this is a steam application I would also watch the steam capacity of the boiler.

    The 28 HE boasts efficiency of nearly 85% on that sized unit, so the payback would be relatively quick.

    Guy Woollard
    Smith Boiler / Mestek
  • Yvon BlaisYvon Blais Posts: 5Member
    340-W-12 Mills Boiler

    Hi Bruce. The 340-W-12 was rated to produce 1,458,000 BTU/Hr. when fired at an input of 13.10 GPH of #2 oil with an oil heat value of 140,000 BTU per gallon.

    Maximum water working pressure was 40 PSI.

    As stated by Guy, Net Water was 1,109,600 BTU/Hr.


    Yvon Blais
  • Brad WhiteBrad White Posts: 16Member
    Well, if Yvon does not know HB Smith

    nobody does. Probably could tell you the color too!

  • B. NorianB. Norian Posts: 11Member

    It's not a 350; the casting clearly shows "340 Mills" and under that, "Series 34." I found an old catalog that lists a Series 34, but it's hand fired; I don't believe that this boiler was ever run on coal. The gross output rating for a 340-W-12 (hydronic) is listed as 9,720 MBH, but that's 'way too much for the building that it serves. The page also lists the firing rate as 13.1 gph, or about 1.8 MMBtuh in. If I can figure out how Mr. Smith got 9.7 MMBtuh out with only 1.8 in, I'll retire.
  • B. NorianB. Norian Posts: 11Member

    Makes sense. Thanks!
This discussion has been closed.


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