In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
I have a home from the 1920 steam heated, two-pipe vapor system. Over the decades, the house has had all new windows, insulation installed, etc. As a result, many of my rads don't fully heat top to bottom before the thermostat is satisfied. (I generally run the house at about 68 degrees F)
Whereas, all rad sizes are original to when the house was coal-fired.
So, when calculating EDR for boiler sizing, should the entire size of the rads be used or should the EDR be reduced to reflect the actual percentage of each rad that heats up. It seems intuitive to me that a house with a significantly improved envelope could make due just fine with fewer BTU's.