1 Scope

1.1 These requirements apply to unvented kerosene-fired room heaters and portable heaters as defined herein. They are for use with Type 1-K Kerosene, and Synthetic Fuels complying with the Outline of Investigation for Synthetic Fuels for Listed Kerosene-Fired Portable Heaters and Kerosene-Fired Room Heaters, Subject 647A, in spaces that are well ventilated to provide the supply of air required for combustion and to reduce the risk of accumulation of carbon monoxide. These heaters are for attended or unattended use. These products are required to be equipped with automatic primary safety controls or to be inherently constructed to prevent abnormal discharge of fuel at the burner in case of ignition failure or premature flame extinguishment. They are not intended for use under the following conditions:

a)    In spaces in which flammable vapors or gases may be present, or

b)    As cooking appliances.

1.2 Requirements for the installation and use of kerosene-fired room heaters and portable heaters are included in the Standard for the Installation of Oil-Burning Equipment, NFPA 31 and in codes such as the BOCA National Mechanical Code, the SBCC Standard Mechanical Code, and the ICBO/IAPMO Uniform Mechanical Code.

1.3 The maximum fuel-input rating for kerosene-fired room heaters is 30,000 Btu per hour (31.65 MJ) and for kerosene-fired portable heaters is 25,000 Btu per hour (26.38 MJ).

1.4 These requirements cover kerosene-fired room heaters and portable heaters that may include electrical circuits rated 600 volts or less and are intended for installation as specified in the National Electrical Code, NFPA 70.

Summary of Topics

These revisions to UL 647 are being issued to address universal upkeep of UL Standards for Safety. These revisions are considered to be non-substantive and not subject to UL's STP process.