4
Thermann Owner’s Guide
Electric and Gas Storage Water Heaters
FILLING, SHUT DOWN & DRAINING
Filling the Water Heater:
Your water heater must be filled with
water before turning on the electrical
supply or lighting the gas.
1. Open all hot water taps.
2. Open the isolating valve at the cold
water inlet slowly and allow the
water heater to fill until water flows
through the system.
3. Close each hot water tap after the
air is expelled from its line.
4. Open the Pressure & Temperature
Relief Valve for approximately
10seconds by lifting the easing
lever on the valve. Confirm water
drains to waste through the relief
valve drain pipe.
5. Lower the lever gently and check it
closes correctly.
Shutting Down a Gas Storage Water
Heater:
1. Remove the access cover and turn
the control knob to the “•” (o)
position.
2. Turn o the gas isolation valve.
Never turn o the gas supply
without turning the control knob
to the o position first.
3. Turn o the cold water supply
isolation valve.
4. Replace the access cover.
Draining the Water Heater:
1. Turn o the electrical supply to
an electric storage water heater
or shut down a gas storage water
heater.
2. Gently operate the easing lever on
the Pressure & Temperature Relief
(PTR) Valve to release the pressure
in the water heater.
3. Disconnect the cold water inlet
union to the water heater and
attach a drain hose.
4. Gently operate the easing lever
on the PTR Valve to let air into the
water heater and allow water to
escape through the hose.
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