Thank you for your question. Unfortunately, without the model number of the furnace, I will only be able to provide some general information. The wattage will vary considerably. You can determine how many watts, the motor on your furnace is using, by multiplying the amps that will be listed on the motor, times the voltage. Gas furnaces will use 120 volts and electric furnaces use 230 volts. For instance, if this is a gas furnace, and the amps listed on the motor is 2.5, then multiply 2.5 x 120 volts and the wattage will be 300. If this is an electric furnace, it would be 2.5 x 230 volts which would be 575 watts. I hope this will help you. For more assistance, reply to this thread with the complete model and serial number and I will be glad to assist you further.