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19
Temperature Regulation
Due to the nature of the typical gas water heater, the water
temperature in certain situations may vary up to 30F° (16.7 C°)
higher or lower at the point of use such as, bathtubs, showers,
sink, etc.
HOTTER WATER CAN SCALD: Water heaters are intended to
produce hot water. Water heated to a temperature which will
satisfy space heating, clothes washing, dish washing, and other
sanitizing needs can scald and permanently injure you upon
contact. Some people are more likely to be permanently injured
by hot water than others. These include the elderly, children,
the infi rm, or physically/mentally handicapped. If anyone using
hot water in your home fi ts into one of these groups or if there is
a local code or state law requiring a certain temperature water
at the hot water tap, then you must take special precautions. In
addition to using the lowest possible temperature setting that
satisfi es your hot water needs, a means such as a mixing valve
should be used at the hot water taps used by these people or
at the water heater. Mixing valves are available at plumbing
supply or hardware stores. Follow manufacturer’s instructions
for installation of the valves. Before changing the factory setting
on the thermostat See Figures 21 and 22.
Never allow small children to use a hot water tap, or to draw their
own bath water. Never leave a child or handicapped person
unattended in a bathtub or shower.
NOTE: A water temperature range of 120°F-140°F (49°C-60°C)
is recommended by most dishwasher manufacturers.
The thermostat of this water heater has been factory set at its
lowest position. It is adjustable and must be reset to the desired
temperature setting for energy effi cient operation at the minimum
water temperature setting that meets your hot water needs. To
reduce the risk of scald injury, 120°F (49°C) is preferred starting
point. Some states have a requirement for a lower setting.
Align the index bar on the thermostat with the desired water
temperature as shown in Figure 21.
Turn the water temperature dial clockwise ( ) to increase
the temperature, or counterclockwise ( ) to decrease the
temperature.
Should overheating occur or the gas supply fail to shut off, turn
off the manual gas control valve to the appliance.
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120°F
Bar
130°F
Bar
Reset
Button
Gas Control Knob
Dial Stop
Index
Bars
Temperature Dial
Robertshaw Gas Valve
140°F
Bar
150°F
Bar
160°F
Bar
FIGURE 21.
Temperature
Settings
Time to Produce 2nd & 3rd
Degree Burns on Adult Skin
160°F (71°C)
About 1/2 second
150°F (66°C) About 1-1/2 seconds
140°F (60°C) Less than 5 seconds
130°F (54°C) About 30 seconds
120°F (49°C) More than 5 minutes
80°F (27°C) - - - - - - - - - - - - - - - -
FIGURE 22.