Parts that measure tank temperature, direct the unit to begin heating and provide safety controls to prevent overheating or other unsafe operating conditions.

Government agency that regulates water heater efficiencies.

Government agency that regulates water heater efficiencies.

Overall efficiency of a water heater calculated by testing tank draw efficiency, recovery efficiency, and standby efficiency using the DOE protocol.

A tank installed on the incoming water line that absorbs expanding water and prevents pressure build up inside the water heater.

Measure of electric power. 1KW = 1,000 Watts

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.