DIN EN 60335-2-35:2012
Household and similar electrical appliances - Safety - Part 2-35: Particular requirements for instantaneous water heaters (IEC 60335-2-35:2005 + A1:2006 + Cor. :2007 + A2:2009, modified); German version EN 60335-2-35:2002 + Cor. :2005 + A1:2007 + A2:2011