21
Water Temperature Regulation
The thermostat is adjusted to the pilot position when it
is shipped from the factory. Water temperature can be
regulated by moving the temperature dial to the preferred
setting. The preferred starting point is 120°F at the “HOT”
setting. Align the knob with the desired water temperature
as shown in Figure 18. There is a hot water scald potential
if the thermostat is set too high.
NOTE:
Temperatures shown on the gas control valve/
thermostat are approximates. The actual temperature of the
heated water may vary.
IMPORTANT:
Adjusting the thermostat past the 120°F bar
on the temperature dial will increase the risk of scald injury.
Hot water can produce first degree burns within:
Table 3:
Water
Temperature °F
Time for 1st
Degree Burn
(Less Severe Burns)
Time for
Permanent Burns
2nd & 3rd Degree
(Most Severe Burns)
110
116
116
122
131
140
149
154
(normal shower temp.)
(pain threshold)
35 minutes
1 minute
5 seconds
2 seconds
1 second
instantaneous
45 minutes
5 minutes
25 seconds
5 seconds
2 seconds
1 second
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15,1978)
VAC
Figure 18
Gas Control Valve/Thermostat
Settings
Gas Control/Temperature Knob
Status
Light
Igniter
120°F
Mark
NOTE:
During low demand periods when hot water is not
being used, a lower thermostat setting will reduce energy
losses and may satisfy your normal hot water needs.
If hot water use is expected to be more than normal, a
higher thermostat setting may be required to meet the
increased demand. When leaving your home for extended
periods (vacations, etc.) turn the temperature dial to the
vacation (VAC) setting. This will maintain the water at low
temperatures with minimum energy losses and prevent the
tank from freezing during cold weather.
Water temperature over 125°F can cause
severe burns instantly or death from scalds.
Children, disabled and elderly are at highest
risk of being scalded.
Feel water before bathing or showering.
Temperature limiting valves are available.
WARNING
Summary of Contents for Ultra Low Nox Series
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