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Posted by Steamhead on June 16, 2011 at 07:54:23:
In Reply to: Re: Boiler sizing Measured radiators posted by HeatPro on June 14, 2011 at 17:28:07:
You only need to increase the size of the boiler if a lot of radiation has been removed from the system, which would mean he pipes are way oversized, or if the pipes will not be insulated.
If the system still has all or nearly all of its radiation and is well insulated, the pickup factor built into the boiler's Net rating will be plenty.
Oversizing boilers is wasteful: you're buying more boiler than you need, and buying more fuel to operate the boiler. Who needs that?
Also, instead of the Utica boiler, I'd recommend the Burnham MegaSteam. It has the highest AFUE and the best warranty of any residential steam boiler available today, and its three-pass design makes it much easier to service. If Burnham offered it with a power gas burner, it would be the only residential steamer we would install.
: Yes for the radiators. Add 25% to that for the big pipes.