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I am in the process of estimating a replacement steam boiler in a big old house in NH. I have been doing this for thirty years but this one has me doubting myself.
The existing boiler is a Weil Mclain Model B773-W The rating plate indicates the capacity of the boiler is 1570 sq ft and 436.5MBTU. The boiler has been converted from oil to gas with a midco gun burner.
My dilemma is the radiatiors connected to the system total 1008 sq ft or 241,920 btu orcalculated using the Sterling Cast Iron Radiator conversion reference book.
In the forty years I have been installinh I have seen boilers oversized before but not to this extent.
There was an old oil burner cleaning tag from 1968 that noted a 3GPH nozzle
I think I should be safe with a new Weil Mclain EGH-125 which would still be slightly oversized.
Suggestions or moral support would be appreciated