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Can Listed Water Heaters be Cord-and-Plug Connected?

Posted By Underwriters Laboratories, Thursday, July 01, 2010
Updated: Thursday, January 24, 2013

Question

Has UL Listed any cord-and-plug connected central air-conditioning units, central heating furnaces or storage tank water heaters?

Answer

No, UL has not Listed cord-and-plug connected central air-conditioning equipment or central heating furnaces.

These types of equipment have been Listed for permanent wiring installations only. They are Listed under UL product category Heating and Cooling Equipment (LZFE), located on page 223 in the 2010 UL White Book or may be found on UL’s Online Certification Directory at www.ul.com/database by entering the category code at the category code search field.

Only small capacity (5 gallons or less) electric household storage tank water heaters or electric commercial water heaters that are designed to permit removal for maintenance and repair have been Listed for cord-and-plug connection. These products are Listed under the product categories Household Water Heaters (KSDT) and Commercial Storage Tank and Booster Water Heaters (KSBZ), both located on page 220 in the 2010 UL White Book, or may be found on UL’s Online Certification Directory at www.ul.com/database and entering the category code at the category code search field.

The requirements used to investigate these products are detailed in the Standard for Safety for Household Electric Storage Tank Water Heaters, UL 174 and in the Standard for Safety for Electric Booster and Commercial Storage Tank Water Heaters, UL 1453.

Tags:  July-August 2010  UL Question Corner 

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