Tools - State Water Heaters Standard Residential Gas Water Heater Service Handbook

RESIDENTIAL GAS, NON POWER VENTED, WATER HEATER
Tools Required:
Phillips head screw driver
•
3/8, 7/16, ¾ inch open end wrenches
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3/16 inch Allen wrench
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11/16 inch – 6 point – socket – for anode removal
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set of marked drill bits
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electrical multimeter
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gas pressure gauge or monometer
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water pressure gauge
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thermometer
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tubing cutter if pilot tube is to be replaced
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hose – to drain tank
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container – to measure gallons per minute flow
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MISCELLANEOUS INFORMATION
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 is 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.
"R" Value is a measure of the resistance of a substance to heat flow.
Thermal efficiency
which enters the water. A percentage of the total BTU passes out through the vent piping.
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.
Sample: temperature change
"R" value
Water cannot
(for all practical purposes) be compressed.
Water expands
when it is heated.
State Water Heater
© 2004
SERVICE HANDBOOK
is approximately the amount of generated BTU (British Thermal Units),
– the water heater's ability to contain heat in the tank. A minimum of tank
= Btu/h loss/ square foot of tank surface
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Technical Training Department
Ashland city, TN