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The future is here. Introducing the next generation of 82% efficiency, high performance, affordable, vented wall furnace heating solutions. The revolutionary design of the CARMEL TG2030TN allows natural gas to power all electrical components. It is self-powered - once the digital thermostat calls for heat, the electronic hot surface ignitor starts the furnace, then thermoelectric power takes over and converts the heat to electrical energy for continued operation. Color: White.