We too woke up to no water, but don't think that the tank is frozen. I drained the tank and the water ran out freely and I refilled it only to still have the pump run with no water coming from the tank. Put a heater in the area for two days plus it's been above freezing for over 24 hours so any suggestions? Also, replaced the pump and that didn't make any difference. Was able to pull water from a jug when using the winterize position on that valve. Is there a check valve at the intake hose in the tank that could have broken? Again, I drained the tank a refilled it only to have the same problem so it doesn't seem to be a freeze problem in the tank.