Wiring - A.O. Smith AOSRE50400 Instruction Manual

Never use the water heater unless it is completely full of water.
To prevent damage to the tank and the heating element, the tank
must be filled with water. Water must flow from the hot water
faucet before turning on the power.

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You must provide all wiring of the proper size outside of the water
heater. You must obey the local codes and the electric company
requirements when you install this wiring.
This water heater is supplied with a flexible, grounded power cord
and connects to a standard three-wire 120 volt 60Hz, grounded
type outlet. If an outlet is not within reach of the power cord,
contact a local electrician/electrical contractor or the local electric
utility to have a properly sized circuit (including outlet, wiring and
breaker) installed. NOTE: Check the water heater's data plate
for power requirements.
If you are not familiar with the electric codes and practices, or
if you have any doubt, even the slightest doubt, in your ability
to connect the wiring to this water heater, obtain the service of
a competent electrician. Contact a local electrical contractor
and/or the local electric utility.
WATER HEATERS EQUIPPED FOR ONE VOLTAGE ONLY:
This water heater is equipped for one type voltage only. Check
the rating plate near the bottom access panel for the correct
voltage. DO NOT use this water heater with any voltage other
than the one shown on the model rating plate. Failure to use the
correct voltage can cause problems which can result in DEATH,
SERIOUS BODILY INJURY, OR PROPERTY DAMAGE. If you
have any questions or doubts consult your electric company.
If wiring from your fuse box or circuit breaker box was aluminum
for your old water heater, replace it with copper wire. If you wish
to reuse the existing aluminum wire, have the connection at the
water heater made by a competent electrician. Contact a local
electrical contractor and/or the local electric utility.