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42
D. Water Temperature Adjustment and Scalding
This water heater can deliver scalding water. Be careful whenever
using hot water to avoid scalding injury. Certain appliances such as
dishwashers and automatic clothes washers may require increased
water temperatures. By setting the thermostat on this heater to obtain
the increased water temperature required by these appliances you
may create the potential for scald injury.
To protect against injury, install a mixing valve in the water system. This
valve will reduce point of use discharge temperatures by mixing cold
and hot water in branch supply lines. Such valves are available from
your local plumbing supplier.
Approximate Time / Temperature Relationships in Scalds
120
o
F
125
o
F
130
o
F
135
o
F
140
o
F
145
F
o
150
F
o
155
o
F
Table 25 - Time and Temperature Relationship in Scalds
An ASSE 1017 or ASSE 1070 temperature limiting or mixing valve is
recommended in installations servicing disabled or elderly persons,
or children. Mixing valves do not eliminate the risk of scalding.
To avoid scalding:
•
Set the water heater set point temperature as low as possible.
•
Feel water before bathing or showering.
•
If thermostatic valves are required, use devices specifically
designed for such purpose. Install these devices in accordance
with instructions provided by the manufacturer.
Failure to install a temperature limiting or mixing valve and follow
these instructions could result in property damage, severe personal
injury, or death due to scalds.
whl-605 Rev. 002 Rel. 000 Date 1.23.19
Figure 43 - Adjusting Temperature at the Mixing Valve
More than 5 minutes
1 1/2 to 2 minutes
About 30 seconds
About 10 seconds
Less than 5 seconds
Less than 3 seconds
About 1 1/2 seconds
About 1 second
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