Heater-does the heater do anything when you turn the thermostat up and down? Does the fan run but no heat produced? Have you checked the fuses.
Water leak-the first thing I would suspect is the toilet valve. I'm afraid you will have to turn the water on and look for leaks. Have a helper turn it on and you look for leaks. Turn the water off as soon as you see the source. FRS radios would help. Do you live in an area where you winterize? If so, has it worked ok since you de-winterized? A good freeze could split pipes if not winterized correctly.