UL 2021 PDF
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UL Standard for Safety Fixed and Location-Dedicated Electric Room Heaters – Fourth Edition; Reprint with revisions through and including January 21, 2026
1 Scope
1.1 These requirements cover fixed and location-dedicated electric room heating equipment rated 600 volts or less to be employed in ordinary locations in accordance with the National Electrical Code, ANSI/NFPA 70.
1.2 These requirements do not cover movable heaters, wall- or ceiling-hung heaters, baseboard heaters, duct heaters, central-heating furnaces, fan-coil units, panel- or cable-type radiant-heating equipment, electric boilers, or any other electric heating equipment or appliances that are covered in or as a part of separate, individual requirements.
Summary of Topics
This revision of ANSI/UL 2021 dated February 2, 2021 includes replacing the reference to the Standard for Power Conversion Equipment, UL 508C, with reference to the Standard for Adjustable Speed Electrical Power Drive Systems – Part 5-1: Safety Requirements – Electrical, Thermal and Energy, UL 61800-5-1; 3.3.4.1 and 21.4
| Edition | 4 |
|---|---|
| Published Date | September 30, 2015 |
| Last Revision | January 21, 2026 |
| Language | English |
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