Your 86 gallon tank holds about 25 gallons of water. A No Tank holds less than ½ a gallon of water. You can't use a No Tank without a Cycle Stop Valve. And I am not sure you can use a Cycle Stop Valve on that 800' deep well. It depends on which pump you have, and how much pressure it can build. If you can use a CSV, then you can use a 4.4 gallon tank as in the picture to the left. This works much better than a No Tank. Then you wouldn't need to put anything outside. Do you have information on the pump, like horse power and GPM?