The use of direct-vent combustion technology allows Empire direct-vent furnaces to be mounted to any exterior wall and makes them more efficient than conventional furnaces. Direct-vent furnaces also use a piezoelectric ignition, so they can run without electrical power.
These furnaces burn more of the fuel put into them and exhaust cooler gases, so there is no need to mount them near a chimney or other vertical exhaust. Since direct-vent furnaces burn more of their fuel than conventional furnaces, they are also more efficient. Direct-vent furnaces can achieve average fuel use efficiency ratings of 95 percent or higher, saving money in the long run.