1.1 These requirements cover heating appliances rated at 600 V or less for use in unclassified locations
in accordance with the National Electrical Code (NEC), ANSI/NFPA 70.
1.2 These requirements do not cover electric heating equipment or appliances that are covered by
individual requirements that are separate from this Standard.
1.3 For the purposes of this Standard, a heating appliance is defined as an electrically energized product
that directly or indirectly generates heat to perform its intended function.
1.4 These requirements also cover electrically energized products that generate steam for other than
space heating purposes and have an electrical power rating of 15 kW or less per steam generating vessel.
1.5 Steam generating products of the type described in 1.4 having an electrical input power rating of more
than 15 kW per steam generating vessel are to be evaluated by the requirements in the Standard for
Heating, Water Supply, and Power Boilers – Electric, UL 834.
1.6 Each steam generating vessel in a multi-vessel unit shall comply with these requirements. The unit
shall also be provided with the marking in 47.37.
2021UL 499-2021 UL Standard for Safety Electric Heating Appliances (Fourteenth Edition; Reprint with Revisions Through and Including February 23@ 2017)
1970UL 499-2017 UL Standard for Safety Electric Heating Appliances (Fourteenth Edition; Reprint with Revisions Through and Including February 23@ 2017)
2016UL 499 BULLETIN-2016 UL Standard for Safety Electric Heating Appliances (COMMENTS DUE: January 16@ 2017)
2014UL 499 BULLETIN-2014 UL Standard for Safety Electric Heating Appliances (COMMENTS DUE: July 7@ 2014)
2014UL 499-2014 UL Standard for Safety Electric Heating Appliances (Fourteenth Edition)
2013UL 499 BULLETIN-2013 UL Standard for Safety Electric Heating Appliances (COMMENTS DUE: March 11@ 2013)
2012UL 499 BULLETIN-2012 UL Standard for Safety Electric Heating Appliances (COMMENTS DUE: March 26@ 2012)
2011UL 499 BULLETIN-2011 UL Standard for Safety Electric Heating Appliances (COMMENTS DUE: January 02@ 2012)
2010UL 499 BULLETIN-2010 UL Standard for Safety Electric Heating Appliances (COMMENTS DUE: May 17@ 2010)
2009UL 499 BULLETIN-2009 UL Standard for Safety Electric Heating Appliances (COMMENTS DUE: February 01@ 2010)
2008UL 499 BULLETIN-2008 UL Standard for Safety Electric Heating Appliances (COMMENTS DUE: January 05@ 2009)
2007UL 499 BULLETIN-2007 UL Standard for Safety Electric Heating Appliances COMMENTS DUE: December 17, 2007