Thermann Owner’s Manual
4 Star Gas Hot Water Heater
14
H4127 Rev. B
Six Monthly Service – By Owner
Open the Pressure & Temperature
Relief Valve for approximately 10
seconds by lifting the lever on the
valve to ensure water is relieved to
waste through the relief drain pipe.
Lower lever gently and check that it
closes correctly.
Other than this, personally inspecting
or servicing any part of the system is
not recommended.
Five Year Service – By Authorised
Personnel Only
After each 5 years of operation you
should contact the local service agent
to replace all safety valves and anodes
to ensure continued system life and
operational safety. In locations where
the water has a TDS greater than 600
mg/L (see Water Quality on page 12),
this service is recommended every 3
years.
The five year service must be carried
out by a licensed tradesperson.
The service should include the
following:
•
Replace the Pressure &
Temperature Relief Valve.
•
Replace the anode.
•
Flush the water heater by doing
the following:
i. Turn off gas and electricity
supply.
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. Flush the heater until clear
water appears then reconnect
all fittings, fill the heater and
restore the gas and electricity
supply.
System Maintenance
