DIN EN 60335-2-21-2009
家用盒类似用途电器 安全性 第2-21部分:贮水加热器的特殊要求
Household and similar electrical appliances - Safety - Part 2-21: Particular requirements for storage water heaters (IEC 60335-2-21:2002, modified + A1:2004 + Corrigendum 1 (ed. 5.0):2007 + A2:2008); German version EN 60335-2-21:2003 + A1:2005 + Corrigenu