I live in central PA and moved into a 3,000 sq foot house, with a 14 year old open loop system w/ a dump well, that we bought earlier this year. The unit seemed to work fine in the summer - every now and then we would notice low domestic water pressure. The unit has been off the last two months with the nice fall weather. Now that we are heating again, when the unit is heating the house, the domestic water pressure is just about worthless. Currently the 3 HP well pump (little over a year old) is cycling on - building pressure to 70 psi - the pressure quickly drops - and the cycle starts again. I believe the pump is at 700 ft in a 900 ft well. I have a nice video of the cycling here: https://www.youtube.com/watch?v=Ibc8wGluPEc I am pretty sure this cycling was happening before we turned the unit back on, there was just no reason to take notice. The attached pictures provide more information about the setup, including the geothermal unit - although I think the problem is elsewhere. This cycling happens even when the valve that sends water to the house and geothermal is closed - so with my limited knowledge I believe the problem is in the pressure tank. I called a local geothermal guy www.midatlanticgeothermal.com and he gave me a few things to look for, but none of that really helped. They will come out and give everything a good look over, but they wanted me to look for simple problems first. Does anyone have any advice?