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I-B-R Rating

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Joeb
Joeb Member Posts: 2
in THE MAIN WALL
When a manufacturer lists a net i-b-r rating and then says the rating is based on an allowance of 1.33 does that mean that the boiler is capable of producing and additional 33% of the net load in steam?

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  • Brad White_9
    Brad White_9 Member Posts: 2,440
    Only when

    the system is fully warmed, in theory, and if the piping distribution is not adding too much parasitic load on the way to your radiators.

    The 33% surplus is for "piping and pick-up" or non-radiation loads that are not aiding your heated space directly. The 1.33 is for steam boilers; Hot water boilers are given a 1.15 factor.

    Normally for hot water, I do not use the I=B=R number. It is too conservative and I like a tight to the number selection where I can.

    For steam, I calculate the amount of connected piping, take into account insulation and convert that to EDR. I make sure my steam boiler has the proper EDR rating. The I=B=R rating at that point becomes incidental and a point of comparison.

    My $0.02,

    Brad
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