In accordance with the standards and criteria in §335.1 of this title (relating to Definitions) (definition of boiler), and the procedures in §335.21 of this title (relating to Procedures for Variances from Classification as a Solid Waste or to be Classified as a Boiler), the executive director may determine on a case-by-case basis that certain enclosed devices using controlled flame combustion are boilers, even though they do not otherwise meet the definition of boiler contained in §335.1 of this title (relating to Definitions), after considering the following criteria: (1) the extent to which the unit has provisions for recovering and exporting thermal energy in the form of steam, heated fluids, or heated gases; (2) the extent to which the combustion chamber and energy recovery equipment are of integral design; (3) the efficiency of energy recovery, calculated in terms of the recovered energy compared
with the thermal value of the fuel; (4) the extent to which exported energy is utilized; (5) the extent to which the device is in common and customary use as a boiler functioning primarily to produce steam, heated fluids, or heated gases; and (6) other factors, as appropriate.
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