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If you have 305 sq ft of radiation that is all you need to know. Forget about BTUs. The boiler rating plate or spec sheet will show how many sq feet the boiler is rated for you don't need to do any conversions or add the pickup factor that is already done by the boiler mfg.

But your calculation of 305 x 240 x 1.33 is correct.

But just use the sq ft rating it is easier.

For Burnham the Steam Max STMX125 is 125,000 input will do 321 square feet of steam. They also have the Independence, but I would stay away from that one.

I am not a Burnham fan however, but the steam max is supposed to be a good boiler

Single most important thing is to INSIST the installer follows the boiler mFG piping diagram. Don't assume he knows this. You will hear "I have been doing this for 20, 30, 40 years yada yada.

Be careful we get horror stories on here weekly that need to be re installed.

And make sure they install a skim tapping and skim the boiler if needed.

You mentioned Brooklyn so maybe @JohnNY , @EzzyT or @Mad Dog_2 . I don't know if they all work in your area.

Forget all those other facts. All that matters is the EDR vs the sq. feet of steam. The Peerless 63-03 is the right size for you.

They list the slip coupling a repair coupling . Slip tee would be cool …

I like Veiga , Its a much tighter connection. I can tell when I catch a off brand in my stock ..

the couplings are called "no stop" instead of "slip" so maybe try that