Don't know the size of place nor how cold it gets. I'd use propane and forget the techie approach. You can get a big pig tank dropped in on your property. They don't usually charge for a tank if you use a minimum amount. Get a small heater/furnace with thermostat. Set it at 45 or 50 degrees. It will only go on as needed if your normal heat is set higher like 60 degrees. Build an insulated cube around your pump and any portions of plumbing that are exposed. Heat tape works too. You may want to place a small propane heater in the pump house as well.
With regard to your water tank freezing, the Great Lakes freeze over with about 4 feet of ice. A little tank at the correct temperature will freeze quickly and usually burst. If you add some compressive floation objects in the tank they can compensate for the freeze thaw. Us Northerners do this with above and below ground pools. I agree with Murf, your estimates for BTU's seems awefully low. Although, we might be thinking in our terms of Winter. We're looking at lows tonight of 29-30 degrees. Last year in mid-February we were at the sled dog races in Chatham and Trenary where the temps got to -14 degrees at 9pm. The Michelobs being served were at temperatures below the recommendations printed on the labels.

I have a device called a "freeze alert" which has a little thermostat connected to my phone line up North. If the temperature drops below 40 degrees, the unit trips. I call there everyday and the phone rings as normal. Since there is no one there to answer, the call is free. If it doesn't ring, I can call the neighbor or drive there with haste!

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