Google <Waterfurnace> to find over 40,000 references to GSHP's. When I built
this house in 94 I had a Waterfurnace brand unit installed. I also sprung
for the hot water option, which during the cooling season provides "free" hot
water by dumping the excess heat from the house into the water heater before
shedding the remainder into the ground loop.
As for the ground loop part: There are three options that I know of
including vertical, horizontal, or surface water. My installer recommended the
vertical option because it requires less excavation than the horizontal
configuration, and because there is no pond or lake nearby for the surface
water system.
It has been a great system for me here in central Iowa and according to
the local power company the added cost of the system was recouped in ~6 years.
>From a happy customer,
Bart Holden
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