I have a new house, with a 8 ton split (5/3) geothermal system, horizontal loops (8-125' loops), in the Pittsburgh area. The Carrier units are both in the basement furnace room, side by side, with the second air handler in the attic for the second floor.
We have gas hot water heater (80 gal). Both geothermal units have HWG in and out connections.
After reading as many posts here as I could find about the use of the geothermal for heating water, I still have a few questions:
1) is it cost efficient compared to gas? I understand it really would only be beneficial in the cooling season (I understand that pricing is against the rules, just wondering if it makes sense)
2) How big should the second tank be? 80 gal? 40?
3) Since I have two separate units, each with their own pumps and loops, is it possible to use both for the HW?