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Boiler sizing

GaryDidier
GaryDidier Member Posts: 229
I have a changeout I need to do. It is a large colonial [4000 Sq. feet] with 28 large cast iron rads. Should a heat loss be done based on the radiation [my suppliers suggestion] or do a standard heat loss. Can anyone supply the tables for BTU formulas for cast iron. Pictures are attached. Thanx, Gary from granville

Comments

  • Steve_35
    Steve_35 Member Posts: 546
    Size to the load (NM)

  • Boilerpro_3
    Boilerpro_3 Member Posts: 1,231
    Size to Actual heat loss for Hot water

    If you are in an area with an energy code, or the more recent Interntional Mechancial Code is in use, typically is required that you complete a heat loss calculation using accepted methods and size your equipment accordingly. Check the radiantion size to determine system operating temp, to see how effective a condensing heat source will be. In homes that size I always recommend a two stage, two boiler heating plant, and nearly all homeowners have gone with this proposal. However, with the advent of smaller modulating boilers in the market, this may be another option. Maybe a new modulating boiler, with a inexpensive conventional boiler for back up (or the existing?) would be nice.

    BP
  • scrook_2
    scrook_2 Member Posts: 610
    size...

    to the heat loss for hot water (and plumb the boiler to protect from condensation unless it's a condensing boiler), size to the radiation for steam.
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