12
Maintenance
Tronic 3000T – 6 720 801 072 (2018/04)
In the event of poor water quality, Bosch recommends
consulting a local water treatment professional for water
treatment options. Always ensure the water heater is
grounded. Models ES2.5 and ES4 must be connected only to a
properly grounded outlet. Damage resulting from poor water
quality or failure to replace the anode rod is not covered
under the manufacturer’s warranty. For additional
questions, please call Bosch Technical Service.
5.4 Removing the heating element
▶ Turn off power supply and drain the heater (see previous
section).
▶ Remove the front cover plate, disconnect terminals X, Y
and T.
▶ Unscrew the 4 heating element retaining nuts F.
▶ Remove thermostat temperature sensor from well [B]
located on the element assembly.
▶ Remove the element G.
Fig. 10
Fig. 11
5.5 Descaling the heating element
Scale deposits can affect the heating capability of the element.
Heavy scale can even cause damage to the element. The
element can be descaled either chemically or manually:
▶ Soak the element in white vinegar or other descaling
solution.
▶ Once descaled, rinse well with fresh water, to which you
should add some baking soda,
-or-
▶ Once the element has dried, use a soft brush (non metallic
to prevent damaging the stainless steel sheath) on
element.
▶ Brush the dried mineral off.
▶ Reinstall the element with gasket and make the wire
connections.
Fig. 12
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