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Oil to Gas (heat loss calc)

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L. P.
L. P. Member Posts: 10
I'm converting my old 1965 oil boiler to a new gas unit and just received my first estimate. I would like to know if the units they are recommending match the heat loss calculation that they did. They stated that the heat loss calc (manual J) was 46,070 and are recommending the following units:

Weil-McLain CGI-4 (100,000 MBH)
Weil-McLain Ultra 80 (if I want high efficiency)

My old 1965 system is 173,000 and probably oversized and pipes to 11 cast iron radiators. I have two separate supply and returns hooked to the system (one thermostat). My home has the following characteristics:

*Built 1930 (2 story 1900 sq ft not including unfinished basement and full unfinished attic with very little insulation. South Jersey Area

*19 windows on first floor (original single pane w/ basic storms installed in 1975)
*12 more windows on second floor (orig single w/ same storms) and 4 smaller windows in attic.
*All walls are plaster(unisulated)

Do you think the units they are recommending are sized to my home based on the heat loss calc that they gave me?

I appreciate any comments that you have to offer.

Thank you.

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