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which boiler

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tmc
tmc Member Posts: 12
in Strictly Steam
I have 142 square feet of radiation not including main, which boiler should I use burnham pin3 or pin4? 

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  • Dave in QCA
    Dave in QCA Member Posts: 1,786
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    PIN3

    Remember, the sq ft rating on the boiler already had the 34% piping loss and pickup factor figured in. Assuming that you have insulation on your mains in the basement, 34% is plenty. The PIN-3 has a rating of 163 sq ft giving you a little room to spare. Remember, vent your mains quickly and your radiators slow, but completely.
    Dave in Quad Cities, America
    Weil-McLain 680 with Riello 2-stage burner, December 2012. Firing rate=375MBH Low, 690MBH Hi.
    System = Early Dunham 2-pipe Vacuo-Vapor (inlet and outlet both at bottom of radiators) Traps are Dunham #2 rebuilt w. Barnes-Jones Cage Units, Dunham-Bush 1E, Mepco 1E, and Armstrong TS-2. All valves haveTunstall orifices sized at 8 oz.
    Current connected load EDR= 1,259 sq ft, Original system EDR = 2,100 sq ft Vaporstat, 13 oz cutout, 4 oz cutin - Temp. control Tekmar 279.
    http://grandviewdavenport.com
  • tmc
    tmc Member Posts: 12
    edited November 2013
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    which boiler

    mains aren't insulated ,app 40'of 2" main, I used dan's formula    142x1.5 =213  213x240=51,120. I know it's close, what would you do?    pin3 has doe rating of 51,000, pin 4 is  87,000                          
  • Unknown
    Unknown
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    anybody but

    Anybody but Junkirk boiler
  • Dave in QCA
    Dave in QCA Member Posts: 1,786
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    that is very close

    When you compare 51,120 to 51,000, it for these purposes the same number. The difference is two tenths of on percent, or 0.2% You could not get a boiler that was closer matched. The 50% piping and pickup factor gives you extra margin already. If you go with the larger boiler, it will be over sized and will not work well.
    Dave in Quad Cities, America
    Weil-McLain 680 with Riello 2-stage burner, December 2012. Firing rate=375MBH Low, 690MBH Hi.
    System = Early Dunham 2-pipe Vacuo-Vapor (inlet and outlet both at bottom of radiators) Traps are Dunham #2 rebuilt w. Barnes-Jones Cage Units, Dunham-Bush 1E, Mepco 1E, and Armstrong TS-2. All valves haveTunstall orifices sized at 8 oz.
    Current connected load EDR= 1,259 sq ft, Original system EDR = 2,100 sq ft Vaporstat, 13 oz cutout, 4 oz cutin - Temp. control Tekmar 279.
    http://grandviewdavenport.com
  • tmc
    tmc Member Posts: 12
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    which boiler

    thanks dave.going with the 3
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