A lot of radiation, small boiler.

[Deleted User]

This is a hypothetical question. I may be dealing with a situation similar to this in the near future. A home has a very old existing boiler with a doe rating of 140,000 btu's. It has roughly the same amount of radiation, it's all cast iron baseboard. A heat loss tells me the home only needs 50,000 btu's. What are the consequences of installing a properly sized boiler on such a huge amount radiation? My concern is condensation problems, Im doubtful the boiler will reach a temperature high enough to prevent this. Would a small bypass between the suppy and return be a possible solution? Any input would be appreciated. Thanks. Mike.

hr

Why not

use a condensing boiler? Then you could modulate the output, outdoor reset, and not worry about cool return temperatures.

And get high efficiency to boot

hot rod

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Steamhead

If you don't use a condensing boiler

use the bypass. This should keep the boiler hot enough. Bet their fuel consumption drops way off, no matter which boiler you use.

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[Deleted User]

Thanks for the input

Thanks for the input. I never got to actually look at the job. The customer has decided to do it himself. He'll probably use a 1,000,000 btu boiler. Mike.

oil-2-4-6-gas

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bigger is better-----right------next year someone will have to come in and knock off a few sections-replace broken pipes etc... job security