This document specifies the terms and definitions, basic requirements, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage and quality commitment of instant electric water heaters (hereinafter referred to as "electric water heaters"). This document applies to instant electric water heaters with rated voltages of single-phase appliances not exceeding 250 V and other appliances rated voltages not exceeding 480 V, intended to heat water below the boiling point. This document does not apply to exposed element water heaters.