So I have all 6 -300 foot loops installed and am still researching the heat source. I am impressed with the COP of the minisplit heat pumps when they heat air. I would love to utilize this technology to heat water. Has that happened yet? Daikin altherma but for real? I will be using electricity to heat the water. 1" conduit is installed between panel and boiler location. Wood burning is prohibited in my shop by the insurance company so electric for this project at 10 cents per kwh. Heat pump boilers going to happen anytime soon?