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Downsizing 1 pipe steam boiler
I have a 192k/152k 30+ year old Penco boiler in a ~1900 sf home in Boston. We’ve slowly been reducing our EDR as we lost a couple rads in a kitchen reno, attic now has a minisplit so is redundant, basement ceilings aren’t used, etc. we are currently at 303 EDR, and we can lose another 24 EDR as our bathrooms have heated floors.
I’m going to get a room by room heat analysis done to realign the radiators with their actual load as we have done a lot of insulation improvements. Whether it is swapping or finding smaller ones, I’m hoping to get my load down to 250EDR. The goal is to get the smallest boiler I can with radiators sized for the actual heat loss of the 1940s home.
What type of wiggle room is there on the pickup factor? I have a 40’ and 20’ main piping. I’ve seen 1.1-1.33?
Ideally I’d size only for the radiators on the 2 main living levels to keep it as small as possible. Trying to reduce nat gas usage as much as possible. Thanks!