Quote:
Originally Posted by AC_Hacker
The high water table would make a trench-type loop field for GSHP very difficult. On the other hand, boreholes would be optimal. Wetter soil makes for better heat transfer.
Regards,
-ACHacker
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We built a new house summer 09' and put in a Geothermal unit. We also have a very high water table (Flood zone). When we were building the water table was so high due to previous flooding the years before that just 1' below the surface we hit water!
This put us out of the horizontal loop option. They tried doing horizontal bores but kept hitting rocks.
Finally we had to pay a little extra and put in 5 wells that were 150' feet deep each.
I'm also thinking that having a high water table might be a good thing for Geo and increase efficiency.
I must say that we are very happy with the results. With our old (poorly insulated) small house (<1000sqft) we were paying roughly $75-100/month to heat. Now our new very well insulated (~2800sqft) house it is costly us only about 2x to heat and we even heat it warmer than we used too!
We almost didn't go with the Geo at first due to the cost being right about 30% higher than a HE Gas boiler. But then the Tax credits changed and removed the cap and we got that 30% back after taxes.