10
H3699 Rev. L
Thermann Owner’s Manual
thermann 25/50 Litre Water Heater
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 licensed tradespeople Only)
the five yearly service should be
carried out by a licensed tradesperson.
It is recommended that this service
be carried out by your local thermann
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.
