Imagine being able to do the dishes, wash your clothes and take a shower all at the same time. This is the unique capability of Lennox' CompleteHeat combination heating system, which is designed to meet the hot-water demands of the biggest, busiest households. Compared to a typical stand-alone water heater, it supplies up to four times more water. The CompleteHeat system consists of two modules: a high-efficiency, water-heater module and an air-handling module. The heating process takes place in the water-heater module, which supplies warm air and heated water to your home through the air-handling module. When water is needed for showers or other purposes, the hot water is drawn directly from the heat module, similar to a conventional water heater. NOTE: The CompleteHeat system is no longer being manufactured, but may still be in service in some homes.