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1. Element Flange Style
Water heater elements are offered in several styles.
Since the development of the modern water heater,
manufacturers have used various methods of installing
elements in their water heaters. There are still many of
these older units in operation today that have the older
style elements. The most common are the Universal
Flange, Flat Flange and the Round Head style. The
Universal and the Flat Flange elements are bolted to
the tank with four 3/8" bolts. The Round Head element
is secured to the tank with a separate 4-bolt flange.
Note: The Universal Adapter Kit (Camco #07223) will adapt
a screw-in style element to a bolt-in style element that can
replace the above elements.
Today, all manufacturers of residential water heaters use
only Screw-in style elements. This style provides for easy
installation and serviceability because it screws into a spud
welded directly on the tank of the water heater. The thread
is a 1" (diameter) x 11-1/2 NPSM thread and is standard for
all residential water heaters that use screw-in elements.
EXCEPTION: For a period
of time, State Industries
manufactured a Duron brand
heater that used a 1-3/8"
thread. These elements are
not interchangeable with the
standard 1" threaded element.
2. Voltages and Wattages
The majority of residential style water heaters use
240v power. The 120v elements are primarily used
for smaller water heaters, point-of-use heaters and
in locations where a 240v circuit is not available.
The wattage rating, which determines the heat
output, of the 240v elements can be anywhere
from 1000 watts to 6000 watts. The wattage rating
of 120v elements is 1000 watts to 2500 watts.
Each model water heater is designed for a specific
voltage/wattage rated element. The replacement
element must be the same voltage and wattage
as the element being replaced. Never exceed the
nameplate rating on the water heater.
Choosing the Correct Heating Element
Element Flange Styles
When choosing the correct replacement element, three factors must be considered:
1. Element Flange Style
(Screw-In, Flat, etc...)
2. Voltage/wattage 3. Watt-density
3. Watt-Density
Another significant difference that should be noted
when choosing a replacement element is the
watt-density construction. Whether the element is
120v or 240v, screw-in or bolt-in, there are three
watt-density ratings available. The watt-density
of an element is basically the amount of heat
concentrated on any point on the surface of
the element.
The lower the watt-density, the greater the amount
of element surface. The heat per square inch of the
surface is reduced, but the total surface is increased
so that the total heat of the element is the same for a
particular wattage. Generally, a lower watt-density in
an element would mean a longer expected life. The
lower watt-density elements normally last longer in
water with high lime content. It helps lower lime
deposit build-up. The fold-back feature of most low
watt-density and Lime Life elements is to keep the
length short enough to fit all tanks.
STANDARD:
Regular High Watt-Density Element
Most common; same as original equipment provided with
most water heaters. It is the least expensive. Can be used in
all replacement situations if the same wattage and voltage
are used.
BETTER: Low Watt Density Element
Most are fold-back elements. Better suited for areas with
problem water (hard water, lime, etc). The lower watt-
density provides no loss of efficiency, yet reduces lime
deposit build-up. Can be used to replace any high watt-
density element if same wattage and voltage are used.
Normally it is more expensive than high watt-density.
PREMIUM: Lime Life Element
Carries a limited 5 year warranty. Ultra low watt-density and
special metal surface (premium grade nickel and stainless
steel) reduce chances of lime build-up. Also resists dry-
firing. Ideal for problem water areas and locations with
intermittent water supply. Higher initial cost, but may last
the life of the water heater.
Screw-In Flange
Fits most GE, Rheem, Rudd, Richmond,
Montgomery Ward, Sears/ Kenmore,
State, Norge, Westinghouse, Reliance,
Noland, A.O. Smith, Bradford White,
GS Wood, Maytag, Whirlpool and
Duro-Matic water heaters, some
Mor-Flo, American and Craftmaster
prior to 1991 and all water heaters
manufactured after 1994.
Universal Flange
Fits older Bradford-White, U.S. Water
Heater, most D&R, Day and Night,
Briggs, Jackson, Tennessee Tank and
early models of State and A.O. Smith.
Round Head Style
Fits July 1975 or older models of State,
Reliance, Sears, J.C. Penney, Crane and
some A.O. Smith. Camco no longer
stocks this style. To replace this style,
use a Screw-In Flange element with a
Universal Adapter Kit (#07223).
Flat Flange
Fits most older Mor-Flo, American,
Craftmaster, some older State, Reliance,
Rheem, Rudd, Richmond, Montgomery
Ward, Norge, Intertherm and
Westinghouse models. Fits some Briggs,
Bradford-White, U.S. Water Heater,
Republic, Day and Night, Jackson,
Tennessee Tank and Duro-Matic.
Содержание Residential Electric water heater
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