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FOR SERVICING RESIDENTIAL ELECTRIC MODELS
#2 Phillips screw driver
•
electrical multi-meter (volt/Ohm)
•
water pressure gauge (with a lazy hand)
•
thermometer
•
hose – to drain tank
•
container – to measure gallons per minute flow
•
1 1/16 inch – 6 point – socket (for anode removal)
•
1 ½ inch deep socket or a manufacturer's element wrench
•
Amp meter- clamp type
•
Draw efficiency
is the quantity of hot water available to the consumer before the outlet water
temperature decreases 25 degrees F. A 40 gallon water heater will typically provide 70% (28
gallons) of this "usable" hot water. The burner or elements are allowed to operate during this
test. Incoming, cold water mixes the remaining stored water below this 25 degree limitation.
Energy Factor
is an indicator of the combined thermal efficiency and standby efficiency of a
water heater. The higher the energy factor, the more efficient the water heater will be.
Recovery rate
is the amount of water that is heated to a set temperature, per hour. An
example might be that a water heater has a recovery rate of 30 gallons of water per hour at 80
degree F. (Fahrenheit) temperature rise.
Temperature rise
is the increase in the temperature from its coldest "inlet" water temperature
to the desired hot (outlet) setting. Typically this is assumed to be 40 degrees entering water;
120 degrees desired stored water or 80 degrees "temperature rise."
Standby efficiency
water heat loss per hour is desired.
Water
(for all practical purposes) cannot be compressed.
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Technical Training Department
Ashland City, Tennessee ©2004
RESIDENTIAL ELECTRIC WATER HEATER
SERVICE HANDBOOK
GENERAL SECTION
TOOLS REQUIRED:
TERMS, DEFINITIONS, AND FORMULAS:
is the water heater's ability to contain heat in the tank. A minimum of tank
2 of 36
Residential Electric Svc Handbook
STC082
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