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储水式电热水器可分为家用和商用两种。家庭用热水器一般容量150L以内就能满足一家人使用。家用热水器一般采用单相220V电源，功率不大于2.5kW，部分用于别墅等大量用水场所的家用中央热水器功率可达到10kW以上。商用热水器一般采用三相380V电源，功率可达到90KW的热水器，可按需定制水箱容量，如500L、1000L。