Not sure I understand, water heaters do not leak internally. What is leaking???? And there should be nothing wrapped around the T&P valve, but it will not cause problems in other devices. Its' purpose is to relieve pressure in the event of a malfunction of the heating equipment that causes overheating and/or excessive pressure in the tank. It is a violation to do anything that will interfere with the proper operation of that valve.
Water softeners are connected to the cold side of the water line and not likly affected by anything that the water heater does. There is supposed to be a check valve in the cold side of the water heater to prevent pressure or hot water from getting into the cold side. But it is possible that it was not installed.
Water softeners are connected to the cold side of the water line and not likly affected by anything that the water heater does. There is supposed to be a check valve in the cold side of the water heater to prevent pressure or hot water from getting into the cold side. But it is possible that it was not installed.
