DIN EN 60335-2-35:2007
Household and similar electrical appliances - Safety - Part 2-35: Particular requirements for instantaneous water heaters (IEC 60335-2-35:2002 + A1:2006 + Corrigendum 1 (ed. 4.1):2007); German version EN 60335-2-35:2002 + Corrigendum:2005 + A1:2007