Buderus SM400/5E, Installation And Maintenance Instructions Manual

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9 Maintenance
SU300/5 | SU400/5 – 6 720 800 019 (2015/04) 25
We recommend that insulated magnesium anodes are additionally
checked regarding the protective current using an anode tester on an
annual basis (

Fig. 24, page 111). The anode tester is available as an
accessory.
▶ Shut off the cold water inlet.
▶ Depressurize the DHW cylinder (

Fig. 17, page 109).
▶ Install and test the magnesium anode (

Fig. 25 to Fig. 28,
page 111).
▶ Replace the magnesium anode if its diameter has been reduced to
below 15 mm.
▶ Check the transition resistance across the earth connection and the
magnesium anode.
Never bring the magnesium anode surface into contact
with oil or grease.
▶ Keep everything clean.