After a week of sub-freezing temperature the water from the mound is up to 122 degrees and holds steady at one gallon per minute. Pics below show the progress made on the buried/insulated lines from the mound to the house.

I will plumb the mound loop directly into my existing hot water heater, pulling cooler water from the bottom of the tank into the mound and pushing hot water into the top of the tank with an in-line circulation pump.

Since the water returning to the mound will be 95-100 degrees, instead of 49-degree well water, I should be able to circulate 3 gallons per minute without the temperature of the water coming from the mound dropping below 120.

That means I'll have a significant amount of hot water to flow on a second loop for a radiant floor heating system. I haven't figured out how many square feet I could heat with 120-degree water at 3 gallons per minute but that's my next question.

I had help, again from Marc Dimario of www.SunWoodSystems.com to dig the trench to the house with his small excavator. He also hooked me up with pipe-insulation and I bought a bunch of 4-inch corrugated pipe that each line was inserted in to prevent ground water from cooling the pipes. Then I covered both of the lines with Prodex reflective foam-foil insulation. This might be overkill but I had some leftover Prodex (great stuff from www.insulation4less.com) from re-insulating my attic/ceilings last fall.

Partially Insulated PipePipesInTrenchToHousePipePartiallyInsulated

Needless to say I'm looking forward to hot water, and warm toes, without burning anything!