Rheem MPi 551 Series Owner's Manual And Installation Instructions page 18

SAVE A SERVICE CALL
HIGHER THAN EXPECTED ELECTRICITY BILLS
With the installation of your new air sourced heat pump water heater, maximum electrical energy savings can
be achieved. Should you at any time, feel your electricity bill is higher than expected, we suggest you check
the following points:
Is the water heater operating in backup heating mode with the red LED flashing?
If there is a fault condition with the heat pump system, the water heater will default to backup heating
mode to ensure a supply of hot water. Check to see if the red LED is flashing as this will indicate there
may be a fault with the system.
"Heat Pump Is Not Operating"
Refer to
Is the relief valve running excessively?
"Temperature Pressure Relief Valve Running"
Refer to
page 17.
Is one outlet (especially the shower) using more hot water than
you think?
"Not Enough Hot Water"
Refer to
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 energy. 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 heat pump operation.
Has your water heating tariff rate been increased by your electricity retailer since your previous bill?
Is the heat pump water heater on the same tariff as the water heater replaced?
The impact on an electricity bill will depend upon the tariff arrangement of the water heater replaced and
where you live. Contact your energy provider for more information on tariff arrangements and cost
comparisons.
Prolonged periods of use when the ambient air temperature is outside of the heat pumps operating
range will increase the amount of boosting and increase running costs.
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU NEED ASSISTANCE,
PHONE RHEEM SERVICE OR THEIR NEAREST ACCREDITED SERVICE AGENT.
on page 15.
on page 14.
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