Anode or Anode Rod
Sacrificial component made of aluminum,
magnesium, or other alloys, that is corroded by electrical currents
in order to protect the inside of the tank.
Parts that measure tank temperature, direct the
unit to begin heating and provide safety controls to prevent
overheating or other unsafe operating conditions.
Water connectors that reduce the flow of
electricity related to galvanic corrosion, from the house piping to
the water heater.
Department of Energy (DOE)
Government agency that regulates water heater
Overall efficiency of a water heater calculated
by testing tank draw efficiency, recovery efficiency, and standby
efficiency using the DOE protocol.
Energy Guide Label
Yellow label displayed on every water heater that
compares that model's energy use to similar models.
A tank installed on the incoming water line that
absorbs expanding water and prevents pressure build up inside the
Gallons Per Hour (GPH) Recovery
The amount of water, in gallons per hour, that a
water heater can raise by 90° increase in temperature.
Measure of electric power. 1KW = 1,000 Watts
Mixing Valve (Tempering Valve)
Device that mixes cold water with hot water
supplied to general use fixtures.
Threaded fittings provided on some models for
incoming and outgoing water pipe connections. Most models utilize
3/4" water connections.
Water that is suitable for drinking because it
contains nothing harmful.
Salts formed and deposited inside the water
heater or on fixtures. Sometimes referred to as lime deposits.
Very high temperatures at the top of the water
heater tank caused by increased cycling of the burner or heating
elements during short draws of water.
Temperature and Pressure Relief Valve (T&P
Safety device that releases hot water when
temperatures inside the tank reach 210°F, or when pressure exceeds
Expansion of water as it is heated.
Electronic device used in place of a mechanical
thermostat that measures water temperature.
Measure of electric power. 1,000 Watts = 1