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Boiler sizing questions

MikeyB
MikeyB Member Posts: 696
The wall hung I am comparing to is a Triton which looks like the closet match i can find in Dans book, Heating surface sq.ft =7 for each section, which should give me 14 total give or take, since my rad is 15" wide 46" long & 2.5 inces thick. It looks like the boiler now is oversized, but a couple of rads might have been down sized over the years. I will only be able to get to a few sections of piping for insulating, due to the basement being finshed about 10 years ago, What do you guys think of piping out of both side of the in4? I know Burnham says it optional.

Comments

  • MikeyB
    MikeyB Member Posts: 696
    Boiler sizing

    Looking to replace a Burham 405 steam boiler w/sq.ft of 350, was installed in 1976 by my old boss. I got all of the radiator edr ratings except for one wall hung radiator in the basement. The total EDR so far comes out to be 231 minus the wall hung. The existing steam header/mains are not insulated, the house is a one family semi-attatched w/new widows and upgrads taking place now and more in the near future.I am looking to install another Burnham boiler either a IN4 or a IN5 (total EDR permitting)I need some help in determining the total edr for the wall hung. I am comparing the wall hung to some mentioned in Dan H's book (E.D.R.) I want to make sure i dont under size w/a IN4 which has an sq.ft rating of 271 or oversize w/a Burnham IN5 which has a sq.ft of 358. And want to make sure if I have to add for a pick up factor or if i will be ok with out it? I attatched some pics of the wall hung on a tread i posted yesterday titled "WALL HUNG RADIATOR EDR. Thanks again guys for your imput.
  • JohnNY
    JohnNY Member Posts: 3,226
    ?

    What is the EDR of the radiator to which you're comparing it?

    Note that the IN5 is about 1.5 times the existing EDR w/o that wall hung.

    I doubt that last rad would move you beyond the output of the smaller boiler.

    Insulate your pipes.

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  • heatguy
    heatguy Member Posts: 102


    i agree with johny insulate pipes thats a big one.you have already changed windows the rads are sized for coldest day id go with the in4
  • MikeyB
    MikeyB Member Posts: 696


    Do i have to worry about adding in the pick-up factor? thanks
  • Steamhead (in transit)
    Steamhead (in transit) Member Posts: 6,688
    It's 33 square feet EDR

    the details are in your other thread. Pick-up factor is included in the Net and EDR ratings. Use the IN4, vent the mains properly and insulate the pipes. The IN5 would be too big.

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  • MikeyB
    MikeyB Member Posts: 696
    thanks guys

    Thanks for all your imput guys, this job is for one of my brothers, and since he is CPA he will be happy to hear that we can install a smaller boiler in his house, Hey Steamhead what do you think about piping out of both sides of the IN4? I have 2- 2" mains to connect too, I can install 2- 2" tees off of the single header to make the connections or just pipe out of both side as well... Once again i do appriciate your imput
  • Steamhead (in transit)
    Steamhead (in transit) Member Posts: 6,688
    It would be better

    to use one riser from the boiler to the header, and increase the horizontal portion of the header to 2-1/2" or 3" than to try to run the steam mains directly off the boiler tappings. You need the header to insure you get dry steam. It will run with a 2" horizontal according to the manual, but using a larger horizontal pipe lets the steam slow down and lose any water it might be carrying.

    Here's a pic where we did this on a Smith G-8, a wet-base boiler with a power gas burner that has a better thermal efficiency than the typical atmospheric gas boiler.

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  • MikeyB
    MikeyB Member Posts: 696


    I will build the header according to Burnham's spec, Whats your take on "Drop headers"? I never built one....
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