Posted by Osterbur on September 26, 2009 at 09:36:58 from (66.253.151.249):
In Reply to: Geothermal posted by Jim from PA on September 26, 2009 at 05:07:17:
I did some research on this last year. I think the max temp you can get is 140 F with geothermal. I also have a boiler. So I set the boiler temperature limit at 140 degrees to see how the system would perform. The result was that on those cold windy nites when demand was highest, the burner would shut off at 140 degrees water temp but the circulator would continue to run about 2 or 3 minutes and then the burner would come back on. In theory this is a better way to do it because you will get more even heat distribution. I found that to be true but only slightly. My furnace is oversized so I was wanting to determine heat loss as I was thinking of replacing the boiler with a high efficiency model. I measured the burner on time when the thermostat called for heat until the thermostat was satisfied and then converted to a percentage. My average burn time was about 25%. Meaning 15 minutes of burn for every hour.
Now I know I can get along fine with 140F water on the coldest nites/days of the year. I live in east central Illinois. I have a 1600 sq ft house with full heated basement. Boiler is 140K btu output.
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