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Standard 2728A – Outline of Investigation for Pellet Fuel Burning Cooking Appliances

March 21, 2019

By Jonathan Brania – Principal Engineer, Foodservice Sanitation + Gas & Wood-Fired Cooking Appliances + Chimneys and Associated Venting

After a brief hiatus, UL reissued its Outline of Investigation for Pellet Fuel Burning Cooking Appliances as UL 2728A. The outline covers forced or natural draft, automatic feed, pellet fuel-burning cooking appliances rated 120 V or less for outdoor residential use and 250 V or less for commercial use. The outline provides minimum requirements for the design, construction and performance of appliances that use pellet fuel combustion for cooking. The pellets are often formed from sawdust or other wood particulates. 

A key update for the document from the previous iteration relates to the use of interlocks to protect against unintended injury related to moving parts. Interlocks must now meet applicable requirements of UL 60730-1, Standard for Automatic Electrical Controls, Part 1: General Requirements, and UL 60730-2-12, Automatic Electrical Controls, Part 2: Particular Requirements for Electrically Operated Door Locks. In addition, combustion tests that were part of the previous outline have been removed from the document.

To purchase a copy of UL 2728A, visit  For more information about UL 2728A or to request a quote for evaluation, contact