sizing replacement boiler

Tom Hopkins

to uninsulated mains is insulate them not oversize the boiler.Select a boiler based on sq/ft of radiation,no need to change sq/ft to BTU's. The sq/ft ratings are all on Mfg's spec sheets and websites

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Mike Kehoe

sizing new boiler, pickup factor

Gentlemen, I have calculated the EDR of my home's radiators, which totals 503. My understanding is that I then multiply that number by 240, giving me 120,720. Assuming that I'm correct so far, I have two questions: First, am I supposed to select a new boiler that has a "Net I=B=R" rating that is closest to this number? And second, do I have to factor in the piping? I have an article that I got off the web, apparentlyl written by someone at Burnham, which states: "There is generally no need to add a 'fudge factor' of any sort if the basement is reasonably warm and the mains are insulated, because the net IBR ratings already incorporate a 33% pickup factor to cover the system inefficiencies. If the basement is very cold and there are excessively long mains that are not insulated, then a small additional factor may want to be incorporated into the boiler sizing." Thanks in advance for any help you can give me.

Mike Kehoe_2

boiler sizing

So that I'm clear, are you saying that if the pipes are insulated, I should choose a new radiator based on the EDR of the radiators, without factoring in anything for the piping?

Tom Hopkins

There's

already .33 factored in, why would you feel that is insufficient?

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Mike Kehoe_3

I wasn't saying that it was insufficient. My question was simply whether the publication was accurate in stating that the pickup was already factored into the Net I=B=R rating. I now understand that it is. Thanks.