How are CLAGE units serviced?

Can the same heating cartridge be used in any CLAGE mini instantaneous water heater in the case of a replacement?

CLAGE GmbH ∙ Pirolweg 1-5 ∙ 21337 Lüneburg · Germany
Fon +49 (0)4131 89 01 38 ∙ Fax +49 (0)4131 83 200
E-Mail export@clage.de