| american national standards institute (ansi) | Agency that sets standards for safety of gas water heaters. |
| 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. |
| british thermal unit (btu) | - The amount of energy required to heat one pound of water by 1°f.
- The amount of heat required to raise the temperature of one pound of water one degree fahrenheit; equal to 252 calor...
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| department of energy (doe) | Government agency that regulates water heater efficiencies. |
| dielectric connections | Water connectors that reduce the flow of electricity related to galvanic corrosion, from the house piping to the water heater. |
| energy cutoff switch (eco) | Gas water heater safety device that shuts off the gas supply to the unit if water temperature exceeds 190°f. the eco is a single-use switch and requires complete replacement of the entire thermost... |
| energy guide label | - Yellow label displayed on every water heater that compares that model`s energy use to similar models.
- The federal trade commission (ftc) requires that gas, electric and oil resident...
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| flue baffle | - A device located in the center of the flue that slows the rising heat and gasses produced by the combustion process, enabling the water to absorb more heat.
- A device to deflect, che...
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| gallons per hour (gph) recovery | The amount of water, in gallons per hour, that a water heater can raise by 90° increase in temperature. |
| mixing valve (tempering valve) | Device that mixes cold water with hot water supplied to general use fixtures. |
| nitrogen oxide | Gas by-product of combustion that is harmful to the earth`s atmosphere. окись азота; |
| temperature and pressure relief valve (t&p valve) | Safety device that releases hot water when temperatures inside the tank reach 210°f, or when pressure exceeds 150psi. |
