10
THM0421 026512 Rev. E
Thermann Owner’s Manual
80L to 400L Electric Storage Water Heaters
Service Information
Six Monthly Service (By Owner)
Operate the Pressure & Temperature
Relief Valve for approximately 10
seconds by operating the easing lever
on the valve to ensure water is relieved
to waste through the relief drain pipe.
Check to ensure the valve closes
correctly.
Five Year Service (By licenced
tradespeople Only)
The five yearly service should be
carried out by licensed tradespeople.
It is recommended that this service be
carried out by your local agent.
The service should include the
following:
• Replace the Pressure & Temperature
Relief Valve.
• Replace the anode. (in areas of
harsh or adverse water conditions
it is recommended that you carry
out a more frequent check of your
anode’s condition, refer Operating
Instructions “Water Quality”)
• Flush the water heater by doing the
following:
i. Turn off the power.
ii. Turn off the cold water supply to
the water heater at the isolating
valve.
iii. Gently operate the easing lever
on the Pressure & Temperature
Relief Valve to release the
pressure in the water heater.
iv. Disconnect the cold water inlet
union to the heater and attach a
drain hose.
v. Gently operate the Pressure &
Temperature Relief Valve to let air
into the heater and allow water to
escape through the hose.
vi. To flush the heater, carry out
steps (i) to (iv) above. Disconnect
the hot water inlet union and
attach a water supply hose to the
heater. Turn on the water supply.
vii. Flush the heater until clear water
appears. Reconnect all fittings,
fill the heater and restore the
electricity supply.
