Table 2. Approximate Time/Temperature Scald Chart.
ALTERNATE SPACE HEATING WATER CONNECTIONS
DANGER
Toxic chemicals, such as those used for boiler treatment,
must not
be introduced into potable water used for space
heating.
This water heater
must not
be connected to an existing heating system or component(s) previously used with a non-
potable water heating appliance.
All piping components connected to this water heater for space heating applications must be suitable for use with
potable water.
This water heater has combination water/space heating connections and is not intended to be used in space heating
only applications.
WARNING
When the system requires water for space heating at temperatures higher than required for other uses, a means such as
an ASSE approved mixing valve shall be installed to temper the water for those uses in order to reduce scald hazard
potential.
Failure to properly pipe this water heater may result in improper operation and damage to the water heater or structure.
Oxygen contamination of this water heater will cause corrosion of iron and steel components and can lead to water
heater failure.
Connect the system supply and return piping to the water heater.
Refer to Figure 9 and Figure 10 for installation examples. Maintain a minimum 1/2” clearance from hot water piping to
combustible materials.
Figure 9. Alternate Space Heating Connections.
APPROXIMATE TIME/TEMPERATURE RELATIONSHIPS IN SCALDS
120°F
(49°C)
More than 5 minutes
125°F
(52°C)
1½ to 2 minutes
130°F
(54°C)
About 30 seconds
135°F
(57°C)
About 10 seconds
140°F
(60°C)
Less than 5 seconds
145°F (
63°C
)
Less than 3 seconds
150°F
(66°C)
About 1½ seconds
155°F
(68°C)
About 1 second
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