Waste heat boilers.

(8) Waste heat boilers. Waste heat boilers use waste heat, usually in the form of combustion exhaust gases, as a substantial source of energy. A substantial source of energy is one that comprises more than 20 percent of the energy requirement on the basis of Btu's during the course of each taxable year (including the start-up year).


26 CFR § 1.48-9

Scoping language

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