Without it you may be unhappy with fluctuating water temperatures. Components of a Demand Water Heater. There are several innovative technologies on the market for heating water. These new systems range from units that can heat water by reusing the waste heat or exhaust from your air conditioner to systems that heat water using renewable energy. These systems save impressive amounts of energy compared to other types of electric water heaters and have the added benefit of cooling and dehumidifying.
Heat pump water heater.
A HPWH works like a room air conditioner, except that it pulls or pumps the heat from indoor air into the water tank rather than releasing it outdoors. Small capacity HPWHs release the cool air to the area surrounding the unit, while larger capacity HPWHs often distribute cooling to other spaces through a home s ductwork. These units come with two small heating elements to assist the HPWH during periods of high hot water use. Add-on units consist of a heat pump that is connected to an existing hot water tank. The heat exchange process occurs outside the tank in a small unit housing the heat pump.