Bradford White D4403S series Manual page 16

Installation (Water Connections) continued-
Hydrogen gas can be produced in an operating water heater that has not had
water drawn from the tank for a long period of time (generally two weeks or
more). Hydrogen gas is extremely flammable. To prevent the possibility of
injury under these conditions, we recommend the hot water faucet to be open
for several minutes at the kitchen sink before you use any electrical appliance,
which is connected to the hot water system. If hydrogen is present, there will
be an unusual sound, such as air escaping through the pipes as hot water
begins to flow. Do not smoke or have open flame near the faucet at the time it
is open.
This water heater can deliver scalding temperature water at any faucet in the
system. Be careful whenever using hot water to avoid scalding injury. Certain
appliances, such as dishwashers and automatic clothes washers may require
increased temperature water. By setting the thermostat on this water heater
to obtain increased water temperatures, the potential for scald injury
increases. To protect against injury, you should install an ASSE approved
mixing valve in the water system. This valve will reduce point of discharge
temperature by mixing cold and hot water in branch supply lines. Such valves
are available from the manufacturer of this water heater or a local plumbing
supplier. Please consult with a plumbing professional.
APPROXIMATE TIME/TEMPERATURE RELATIONSHIPS IN SCALDS
120°F (49°C)
125°F (52°C)
130°F (54°C)
135°F (57°C)
140°F (60°C)
145°F (63°C)
150°F (66°C)
155°F (68°C)
WARNING
More than 5 minutes
1½ to 2 minutes
About 30 seconds
About 10 seconds
Less than 5 seconds
Less than 3 seconds
About 1½ seconds
About 1 second
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