Rheem 491 Owner's Manual And Installation Instructions page 23

EXPANSION CONTROL VALVE RUNNING
If an expansion control valve is fitted in the cold water line to the water heater
(refer to the cold water connection diagram on page 32) it may discharge a small
quantity of water instead of the 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 bill is higher than expected, we
suggest you check the following points:

Is the relief valve running excessively?
Refer to "Temperature Pressure Relief
Valve Running" on page 22.

Is one outlet (especially the shower)
using more hot water than you think?
Refer to "Not Enough Hot Water" on
page 21.

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 bill?
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 "Single Element Model" on page 11 and "Twin Element Model"
on page 11.
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU
NEED ASSISTANCE, PHONE RHEEM SERVICE OR THEIR NEAREST
RHEEM SERVICE CENTRE.
23
SAVE A SERVICE CALL