(A) Off-specification used oil fuel must be burned for energy recovery only in the following devices:
(1) Industrial furnaces identified in rule 3745-50-10 of the Administrative Code;
(2) Boilers, as defined in rule 3745-50-10 of the Administrative Code, that are identified as follows:
(a) Industrial boilers located on the site of a facility engaged in a manufacturing process where substances are transformed into new products, including the component parts of products, by mechanical or chemical processes;
(b) Utility boilers used to produce electric power, steam, heated or cooled air, or other gases or fluids for sale; or
(c) Used oil-fired space heaters, provided that the burner meets the provisions of rule 3745-279-23 of the Administrative Code; or
(2) Used oil burners may aggregate off-specification used oil with virgin oil or on-specification used oil for purposes of burning, but must not aggregate for purposes of producing on-specification used oil.