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how Electric Heat Pump water heaters work

These types of water heaters use a heat pump to heat the water inside the tank.
HEAT PUMP TECHNOLOGY
Electric heat pump water heaters use electricity to move heat from one place to another. Like an air conditioner in reverse, heat is pulled from the ambient air and transferred into the water inside the tank. In addition to heating water, it also cools and dehumidifies the surrounding air.
ADVANCED ELECTRIC CONTROLS
The digital display is customizable to meet your unique needs with 3 operating modes and a programmable Vacation setting. It also provides diagnostic reporting via the eye-level user interface panel.
EVAPORATOR COIL & COMPRESSOR
A fan brings air in through an air filter and evaporator coil. The evaporator coil contains refrigerant, which absorbs heat from the air. The refrigerant is then pumped through a compressor, which increases the temperature of the refrigerant.
CLOSED-LOOP CIRCULATION
The hot refrigerant is circulated through a closed-loop system from the compressor through a coil that wraps the tank. As the refrigerant passes through the coil, heat is transferred from the refrigerant into the water.
FOAM INSULATION
The tank is surrounded by a thick layer of environmentally-friendly non-CFC foam to trap heat inside the tank, saving energy.
DUAL HEATING ELEMENTS
For periods of high demand, our heat pump water heater has two 4500W electric copper elements to improve recovery times.
GLASS LINING
We coat the interior of the tank with porcelain enamel glass to protect the tank from corrosion, chemical resistance (acid or alkaline) and thermal shock.
ANODE ROD
The top-mounted anode rod fights the corrosive effects of hot water to extend the life of the tank.  Anode rods are sacrificial parts that should be checked for depletion as part of routine water heater maintenance.
T&P RELIEF VALVE
As cold water heats up, the pressure in the tank grows. The temperature & pressure relief valve is a safety feature that allows the tank to relieve the pressure from thermal expansion.
CERTIFICATION
Meets UL 174 and UL 1995 code requirements, as well as efficiency standards found in the latest edition of the National Appliance Energy Conservation Act and U. S. Department of Energy.