5
GENERAL SAFETY
To meet commercial hot water requirements, the tank-
stat is adjustable up to 190°F. However, water
temperatures over 125°F can cause severe burns
instantly or death from scalds. This is the preferred
starting point for setting the control for supplying gen-
eral purpose hot water.
Safety and energy conservation are factors to be con-
sidered when setting the water temperature on the
tankstat. The most energy efficient operation will result
when the temperature setting is the lowest that satis-
fies the needs consistent with the application.
Maximum water temperatures occur just after burner
has shut off. To find hot water temperature being deliv-
ered, turn on a hot water faucet and place a
thermometer in the hot water stream and read the
thermometer.
Water temperature over 125°F can
cause instant severe burns or death
from scalds.
Children, disabled, and elderly are
at highest risk of being scalded.
See instruction manual before set-
ting temperature at water heater.
Feel water before bathing or show-
ering.
Temperature limiting valves are
available, see manual.
Table A details the relationship of water temperature
and time with regard to scald injury and may be used
as a guide in determining the safest water temperature
for your applications.
Time/Temperature
Relationships in Scalds
The temperature of the water in the storage tank can
be regulated by setting the temperature dial on front of
the tankstat. To comply with safety regulations, the
tankstat was set at its lowest setting before shipment
from the factory.
Fig. 1 illustrates the tankstat. To adjust the water tem-
perature, insert a small straight screwdriver into slotted
screw in hole in front of tankstat and turn wheel to
desired setting. Thermostat is adjustable up to 190°F.
Temperature
Time to Produce Serious Burn
120°F
More than 5 minutes
125°F
1-1/2 to 2 minutes
130°F
About 30 seconds
135°F
About 10 seconds
140°F
Less than 5 seconds
145°F
Less than 3 seconds
150°F
About 1-1/2 seconds
155°F
About 1 second
Table courtesy of Shriners Burn Institute.
Table A: Time to Produce Serious Burn
Fig. 1: Tankstat Adjustment
