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Stacking
Stacking occurs when a series of short draws of hot water
(3 gallons or less) are taken from the water heater tank.
This causes increased cycling of the burner and can result
in increased water temperatures at the hot water outlet. A
tempering valve must be installed in the hot water supply
line to reduce the risk of scald injury.
Water Temperature Regulation
Figure 22:
Temperature Dial
The thermostat is adjusted to its lowest temperature setting
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 130°F;
however, in some instances, setting the water heater higher
than 130°F can reduce the occurrence of igniter failure due
to excessive condensate.
Important: A tempering valve (provided) must be installed
in the hot water outlet to reduce the risk of scald injury
when setting the thermostat in excess of 120°F.
Many home heating systems used with this water heater
are designed for temperatures higher than 130°F. Refer to
the manufacturer’s instruction manuals supplied with this
type of equipment for recommended temperature settings.
Important: Adjusting the thermostat past the 120°F setting
on the temperature dial (see figure 22) will increase the
risk of scald injury. Hot water can
produce first degree burns within:
120°F (49°C) more than 5 minutes
130°F (54°C) at 20 seconds
140°F (60°C) at 3 seconds
150°F (66°C) at 1-1/2 seconds
160°F (71°C) at less than 1 second
Emergency Shut Down
Important: If overheating occurs or
the gas supply fails to shut off, close
the manual gas supply valve. Turn off the electrical supply to
the unit and close the cold water supply valve. Do not operate
the water heater again until it has been thoroughly checked by
an authorized service technician.
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.
See instruction manual before setting
temperature at water heater.
Feel water before bathing or showering.
Temperature limiting valves are available.