Rheem Optima Owner's Manual And Installation Instructions page 17

EXPANSION CONTROL VALVE RUNNING
If an expansion control valve is fitted in the cold water line to the water heater
(refer to page 27)
temperature pressure relief valve on the water heater. The benefit is that
energy is conserved as the discharged water is cooler.
HIGHER THAN EXPECTED ELECTRICITY BILLS
Should you at any time, feel your electricity account is higher than expected,
we suggest you check the following points:
Is the relief valve running excessively?
Refer to "Temperature Pressure Relief
Valve Running"
Is one outlet (especially the shower)
using more hot water than you think?
Refer to "Not Enough Hot Water"
page 15.
Is there a leaking hot water pipe,
dripping hot water tap, etc?
Even a small leak will waste a
surprising quantity of hot water and
electricity. Replace faulty tap washers,
and have your plumber rectify any
leaking pipe work.
Has there been an increase in hot water usage?
An increase in hot water usage will result in an increase in water heater
operation.
Has your water heating tariff rate been increased by your electricity retailer
since your previous account?
ELECTRICITY TARIFFS
The electricity tariff to which your water heater is connected will determine the
overall operating cost of the system. It is important you are aware of this tariff,
i.e. Off-Peak (overnight) or time controlled supply, Extended Off-Peak
(overnight and day) or Extended time controlled supply, Domestic / Continuous.
For types of tariffs, refer to
Element Model" on page 7.
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU
NEED ASSISTANCE, PHONE A RHEEM SERVICE CENTRE.
it may discharge a small quantity of water instead of the
on page 16.
"Single Element Model"
on
17
SAVE A SERVICE CALL
on page 7 and "Twin