Typically, a standard blower fan needs on average 400 watts of electricity. This means that it needs a 15-20 amp circuit. However, depending on the size of your furnace, the amount of needed power could be 20 amps or more.

How many watts does a blower motor use?

A standard fan motor uses 400 watt per hour while a variable-speed motor uses 75 watt per hour. The most direct way to save electricity is by using the variable-speed units, but there are other ways to save energy as well.

How many watts does a furnace blower fan use?

How Many Watts Does a Furnace Blower Use? It depends on whether or not you have a standard fan motor or if you’re operating with a variable-speed motor. The standard is about 400 watts per hour, but the high-efficiency variable-speed models can deliver at about 75 watts per hour!.