Specifications
5
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Outer Jacket - The outer jacket of an electric water
heater consists of three pieces: the jacket top, jacket skirt
and jacket boom. The jacket provides a space for
insulaon around the tank, prevenng the consumer from
coming into contact with hot surfaces and to reduce
energy loss. Connecons extend from the tank through
the outer jacket to provide plumbing connecons for the
cold water inlet and the hot water outlet.
Glass Lined Tank - A water heater tank is constructed of
three pieces of steel: a top head, a boom head and a
shell. These three pieces are welded together to form a
tank that will withstand a working pressure of 150
pounds per square inch. The interior of the tank is coated
with a ceramic material, baked on at about 1600°F, which
will not break or crack, unless it receives a blow severe
enough to dent the steel tank. This coang helps protect
the tank from the corrosive eects of hot water.
Insulaon - Between the tank and the outer jacket is a
layer of thermal insulaon. Three materials are used as
insulaon in water heaters: non-CFC polyurethane foam,
berglass and polyester. Non-CFC polyurethane foam is
the more ecient of these materials and is injected
through a port in the outer jacket in liquid form. This liquid
expands quickly lling in the space between the tank and
jacket and then dries. Polyester or ber-glass is used
around all openings and controls to ensure that the
non-CFC polyurethane foam does not cover these devices.
Polyester
Foam Dam
Electric Water Heater Parts
Incoloy Element
Plated Copper Element
Element - The element consists of an inner wire
surrounded by ller material enclosed in a sheath of
copper or stainless steel. The thermostat allows electrical
current to ow through the inner wire and from the
wire’s resistance it also creates heat which is transferred
through the ller material to the outer sheath and is then
absorbed by the water. Elements may be available in
dierent waages and materials to meet specic heang
requirements.