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Replacement steam boiler

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Jim_4
Jim_4 Member Posts: 6
in THE MAIN WALL
Existing steam boiler is for 938 sq.ft.,
I calculated all the steam radiators and came up with only 782 sq. ft. and found no sign of disconnected radiators.
My question is what size boiler should I go with as a
replacement. The replacement boiler sizes in sq. ft. are
812, 900, or 996. And what is the reasoning for a selection.

2nd question is have a 28 ft. wet return that runs along the
floor. How will I know if it is partially plugged with
debris from over the years and if it is what is the most
pratical solution?

Comments

  • Brad White_106
    Brad White_106 Member Posts: 8
    Double-Check your EDR Measurements

    do a take-off of your piping and convert the area to EDR and add it in. This last part is to "know" versus "guess" what your connected piping factor is. (If it is well insulated you can assume about half of the piping as additive EDR). I would go with the smallest that meets the connected. You did not say if it is net I=B=R or gross SF in your ratings. The I=B=R has a 33% piping factor built-in so is conservative.

    I would not install a boiler larger than the connected radiation (no less than but certainly not a full increment more "just to be sure".) No purpose in driving more steam out than the radiators can condense.

    The only reason I would increase the selection capacity is if I were planning an addition.

    I take it that the radiators also meet your heat loss now or if they exceed the heat loss you will be leaving them as they are.

    My $0.02

    Brad
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