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Posted by HeatPro on January 24, 2005 at 14:47:34:
In Reply to: Replacing boiler posted by Pat S on January 24, 2005 at 13:47:54:
Making domestic hot water happens about 3 hours out of an entire day. About 2 hours in the AM and 1 hour at night. The boiler has the rest of the day to make up the hot water so there is no need for an added larger input to provide for hot water with an indirect water heater. As many residential indirects of 60 gallons have a heat exchanger that can make 70 gallons of hot water with 170F water, 70,000 btuh output or 60,000 btuh IBR rating is about as large as you need to go to get enough boiler to heat the most water.
http://64.226.150.132/hydronic/domestic/boiltank/boiltank.htm
For a family your size, a larger 80 or 100 gallon tank with the regular size boiler is a better situation.