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So… we have two critical paperwork steps here. First, does this property have the necessary rights to use enough water? For those unfamiliar with Western water law — like anyone east of the Mississippi! — it is well to remember that just because there is water on a property — or beneath it — does NOT mean that the property owner has the right to use it! Water rights (and mineral rights for that matter) do NOT run with the land.

Then second, how much heat does this place need? Can water at that temperature (85 F mean temp) provide that much heat with a reasonable surface area?

Answer those two, then we can begin think about practicalities…

If you were to use the hot spring with a heat pump you have to understand that if you have an oil leak or refrigerant leak it will contaminate the hot spring.

What you need in order to make use of the heat from the hot spring is to use an insulated buffer tank to store hot water and also deliver it to the home using multiple copper coils in the large storage tank,

Using 2 small circulators where one can feed the hot water from the spring to the tank and the other feeding the hot water from the copper coils to cast iron or steel tube radiators with the cooler water allowed to drain back to the hot spring.

The thermal mass built into the cast iron or steel tube radiators along with the thermal mass in the water from the hot spring can be used to its fullest advantage.