A Generac generator running on natural gas typically burns 100 to 300 cubic feet of natural gas per hour. The exact number depends on the unit’s size and how hard it’s working. A 10kW unit at half load uses around 130 cubic feet an hour. A 22kW unit at full load can hit closer to 300.
So how much natural gas does a Generac generator use per hour? It comes down to two things: the kW rating and how much of your home’s power draw the unit is covering.