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Posted by HeatPro on January 05, 2011 at 08:10:04:
In Reply to: Re: Boiler and indirect sizing posted by Barry on January 04, 2011 at 17:52:56:
IF your heat loss is 50,000 btuh, and your boiler is 74,000; then you are capable of completely heating a tankful of water every other hour, and your boiler won't run more than 40 minutes of the hour in the coldest weather. The greatest losses of the boiler are when it is sitting off, while hot.
You can make less stand-by loss by installing a control that runs the heat of the boiler into the indirect, so the heat isn't wasted by the 50% oversized boiler.
: I have the 40 gallon weil mclean tank right now, it is about 7-8 years old, don't really want to replace at this time. One thought was to maybe replace down the road when kids are using more water vs getting larger boiler right now. Would the MPO 84 or Buderus g115ws/3 both at 74000btu net sound suffucient if using HW priority?
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