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TERM
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EXPLANATION
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E. Coli |
The common abbreviation of Escherichia Coli.
One of the members of the coliform groups of bacteria indicating fecal
contamination. |
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ECO |
Energy Cut Off. A safety
device designed to shut power off to the water heater and prevent high
temperature. |
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EF Energy Factor |
A measure of the overall efficiency rating
of the water heater based on the model's recovery, efficiency, stand-by
loss and energy input. |
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EMT |
Electrical Metal Tubing.
A thin wall galvanized steel pipe used to carry electrical or other types
of conductors. |
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ERW |
Electric Resistance Weld.
Most common form of manufacture for pipes 2 3/8" to 22" in diameter.
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Earthquake Strap |
A metal strap used to secure a water heater
to the house frame or foundation. |
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Eccentric Shank |
A shank or the fitting with a shank in which
the centerline is offset to allow minor compensation for supply lines
that would be difficult to precisely position. |
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Eductor |
A device utilizing a nozzle and throat, installed
in a stream of water to create a partial vacuum to draw air or liquid
into the stream; commonly used to draw regeneration chemicals into an
ion exchange water treatment system, such a softener or deionizer.
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Efficiency |
A product's ability to utilize input energy,
expressed as a percentage. |
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Effluent |
Septic system liquid waste |
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Ejector
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A mechanical device for pumping sewage from
below the sewer line. |
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Elbow |
A fitting with two openings that changes the
direction of the line. Also known as an ell. It comes in various angles
from 22 ½ degrees to 90 degrees; often referred to by their angles (i.e.
45, 90) |
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Electric Resistance Weld Pipe (ERW)
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Cold finished pipe made by a series of operations
in which the flat rolled material is cold shaped into tubular form and
welded at the seam. The heat for the weld is generated at the seam by
the resistance to the flow of electric current applied through electrical
contacts or an induction coil. |
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Electrodialysys |
A process which uses an electrical current
and an arrangement of permeable membranes to separate soluble minerals
from water. It is often used to desalinate salt or brackish water . |
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Electrolysis |
A process involving chemical change caused
by the passage of an electric current through a liquid. |
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Electrolyte |
A nonmetallic substance that carries an electric
current, or a substance which, when dissolved in water, separates into
ions which can carry an electric current. |
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Element |
Heating unit in an electric water heater
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Elevation |
The vertical distance between the level where
fluid enters a pipe and the level where it leaves. It must be added to
the
Total Discharge Head if the inlet is lower than the outlet and subtracted
if the inlet is higher. |
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Elongated |
The shape of a some toilet bowls, where the
bowl is about 2 inches longer than the standard round front bowl, usually
14 inches wide by 18 ½ inches long. |
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Enamel |
An opaque vitreous composition applied by
fusion to the surface of metal fixtures such as cast iron and pressed
steel tubs, lavs, and sinks. Enameled steel is less durable than enameled
cast-iron. |
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Enclosure |
Panels of glass or other material used to
form shower or tub stalls. |
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End Body |
A faucet valve body configuration in
which both the inlet and outlet are at the end of the valve body.
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End Drain |
The side of a tub where the drain is found.
When facing a tub, if the drain is on the right, this is a Right-Hand
tub (RH). If on the left, it is a Left Hand tub (LH). On whirlpools, the
pump is located opposite the drain. |
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Endpoint |
(1) The point at which a process is
stopped because a predetermined condition is met;
(2) in an ion exchange water softener service run, this is where
the hardness of the softener effluent increases to a predefined concentration,
often 1.0 grain per gallon;
(3) in a filter service this may be where the pressure drop across
the filter reaches a predetermined value. |
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Energy Guide Label |
The label required by the FTC on water heaters
that show 1) an estimated annual cost of operation and 2) how that unit's
efficiency compares to all other comparable models. |
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Escutcheon |
A decorative metal flange or trim shield beneath
a faucet handle that covers the faucet stem and the hole in the fixture
or wall. |
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Expansion Tank |
A tank designed to absorb excess pressure
due to thermal expansion. (e.g. closed system) |
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Expansion Valve |
Thermostatically controlled valve that controls
liquid refrigerant. |
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Extinction Pop |
A flashback occurring when a burner is turned
off. |
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Extra Strong |
A standard pipe weight designation (XS). Sometimes
called XH (Extra Heavy) |
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Extrusion |
Refers to the result of forcing molten metal
or plastic through a die or mold to form a specific shape. Commonly refers
to shower door components such as jambs and headers that were created
by extrusion. |
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Eye of the Impeller |
The center of the impeller, where the fluid
enters. |
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