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EDR

OK Here we go again. Have done an inventory of my radiators and there EDR values came up with 35 radiators and one unit heater total EDR in sq.ft is 1106. I don't know the EDR of the space heater. My boiler is rated I=B=R Net 2021sq. ft. or 485 MBH. This is telling me that my boiler is about 2x the size its suposed to be. Now keep in mind I have 300 feet of exposed 3" pipe that adds another (oops lost my factor) 1.33 x 300= 399 sq.ft.so my total is still about 515 sq. ft oversized. This is not adding up considering the unit never cycles on pressure and has long run times. Could this be the leavel of down fire of my boiler?

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