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Re: Replacing Old Steam Boiler With New???

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Posted by george on July 21, 2006 at 09:40:07:

In Reply to: Re: Replacing Old Steam Boiler With New??? posted by joe on July 20, 2006 at 12:12:19:

As heatpro said
"As steam systems are an early type of central heating, installed in the 1800's and on, the latest generation of plumbers aren't as aware of steam design as is necessary, so mistakes will be made.

A steam boiler must fill the entire steam sytem with steam on each cycle to get all radiators to heat. This means that no matter what the heat loss of the house is today, the steam boiler must have enough steam output to heat all the radiators in the house - or some rooms will remain cold and the boiler will run all the time wasting money if the main thermostat is in the unheated room.

As each square foot of equivalent direct radiation must be hit with steam,
the way to size a steam system is to count the number of square feet of equivalent direct radiation, multiply by 240 btuh for each sq ft EDR, then multiply the total by 1.5 to make sure there is enough boiler output to heat the boiler, pipes and radiation up to 212F from a cold start.

This makes total sense. Unfortunitely my house
may be a little warmer than I like with
insulation put in attic. But the wife likes it
that way anyway.

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