boiler capacity

Ken_40

Are true "net" output ratings - with some "fudge" built in.

"Cheating" by such a small amount, presuming you have done a real heat-load-calculation by "scientific" means, would be well within the I=B=R fudge factor parameter.

Use the 3,600 BTU "light" boiler without fear.

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Mark_7

boiler capacity

How far do some of you guy's push the capacity rating of a bioler? Have a replacement to do in a row home,heat loss is 113,600 on a 5" day and were looking at the solo110. Just because the chance of that temp is slim. Home has cast iron radiators.

hr

All the heatload calculators

have a fudge factor built in, in my opinion.

Years ago the RPA compared a bunch of heatload software programs. I remember somewhere around a 30% "cushion' in some.

Use the boiler output numbers at the efficiency you expect. High temperature operation may not provide 90% efficiencies?

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ALH_4

Zoning

I agree with both Ken and HR. There are hidden fudge factors everywhere in the numbers. No one wants to be the guy who undersized a boiler. If it were me, I would install the Solo 110 given the information in your post.

Is the system all one zone? Zoning the system will allow them to lower temperatures of certain rooms which will give them more capacity for the rooms they want warmer, not to mention reducing their fuel use. Thermostatic radiator valves would probably be a nice retrofit at some point.

hr

Certainly some envelope upgrades

could help the numbers, and the homeowners fuel costs.

Even a weatherstrip upgrade can make some huge improvements in the "leakage" numbers

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