Our pipes froze recently and we heated the ones connected to the outside of the house. They thawed and the cold water is running now. However, I cannot get the hot water to run, or my tub faucet either. the heat is on in the house, and the water heater is located in the bathroom closet. We have pex piping running in the bathroom and all piping from the water heater is located inside interior walls. Is there something I can do? Or am I missing something.