Eclipse Extern-a-Therm recuperators are tubular air-to-air heat exchangers designed to recover waste heat from industrial exhaust gases. The heat recovered is used to preheat combustion air for the system's burners, which increases fuel efficiency.

Our customers have measured pre-heated air temperatures of 700°F. This indicates a fuel savings of 20%. Which means an Extern-a-Therm recuperator can pay for itself in less than two years, based on the amount of fuel savings at a cost of $7.00 per 1,000 cubic feet of natural gas.