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  1. #1
    Join Date
    Dec 2007
    Posts
    52

    what size boiler do i need?

    i just did a heat loss calc of my house.

    it is 75 BTUs/hr (for a 0 degrees day. i live in philly)

    what rating BTUs boiler do i need?

    thanks,
    kodo

  2. #2
    Join Date
    Feb 2003
    Posts
    1,996

    I assume you mean 75K BTU

    You need a boiler that outputs at least 75K.

  3. #3
    Join Date
    May 2006
    Location
    Philadelphia, PA
    Posts
    1,397
    Quote Originally Posted by kodo View Post
    i just did a heat loss calc of my house.

    it is 75 BTUs/hr (for a 0 degrees day. i live in philly)

    what rating BTUs boiler do i need?

    thanks,
    kodo
    0 is much to low. I will guess you can heat your home with 50k. Adjust your program to 14 deg outside temp. It is very rare it stays below this for more than a couple hours on the very coldest days of the year. Set indoor temp at the temp you feel comfortable.
    Climate Control Solutions for your Home or Office

    Serving Northeast Philadelphia and Surrounding Areas

  4. #4
    Join Date
    Dec 2007
    Posts
    52
    ok, to be conservative i changed it to 10 degrees.

    it went down to 65k btu

    anybody have any ideas why the installer of my boiler (before my time) put in a 125k btu, and all the proposals i have gotten for a new one (three) have been for about 115k?

    the slant/fin heat calc was very thorough.

    am i falling into some novice misconception?

    as a reality check, my house is
    -1700 sq ft
    -100 years old
    -two-layer brick 1st and 2nd floor (uninsulated)
    -frame third floor and attic (heavily insulated)
    -double glazed windows
    -kept at about 65* avg
    -uses the boiler for DHW

    thanks,
    kodo

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