American Water Heater GAS-FIRED COMMERCIAL WATER HEATER - Manual (Page 20)

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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 the increased temperature water required by these appliances, you
may create the potential for scald injury. To protect against injury, you should
install an anti-scald tempering 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 local
plumbing supplier.
Please consult with a plumbing professional. For information regarding space
heating water connections and plumbing arrangements, refer to page 40.
Gas Connections
WARNING
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.
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