UL2021是固定的和定位专用的房间电暖器的标准。
UL 474
加湿器(Humidifiers)
UL 998
移动式及挂墙式或挂天花板式室内电暖器
(Movable and Wall- or Ceiling-Hung Electric Room Heaters)
UL 1278
电加热器(Electric Heating Appliances)
UL 499
家用储水式电热水器(Household Electric Storage Tank Water Heaters)
UL 174
电风扇(Electric Fans)
UL 507
电熨斗(Electric Flatirons)
UL 1005
真空吸尘器、鼓风式清洁器和家用地板护理器
(Vacuum Cleaners, Blower Cleaners, and Household Floor Finishing Machines)
UL 1017
电动理发、剃须器具(Hair Clipping and Shaving Appliances)
UL 1028
家庭个人修饰用电器(Household Electric Personal Grooming Appliances):如电吹风机
UL 859
电热垫(Electric Heating Pads)
UL 130
电热垫褥(Electrically Heated Bedding)
UL 964
家用电灶(Household Electric Ranges)
UL 858
家用电灶具和食品加工器具(Electric Household Cooking and Food Serving Appliances):
如电烤面包机、慢炖锅等
UL 1026