Energy recovery unit
Energy recovery unit means a combustion unit combusting solid waste (as that term is defined by the Administrator in 40 CFR part 241) for energy recovery. Energy recovery units include units that would be considered boilers and process heaters if they did not combust solid waste.
40 CFR § 60.2875
Terms used but not defined in this subpart are defined in the Clean Air Act and subparts A and B of this part.