You main draw is your burner, which (depends on the brand) will draw a starting wattage of around 7-10 amps, then settle down to between 2-5 amps. Your whole system is less than 10 steady amps, and probably closer to 5.Click to see full answer. Similarly, how much power does an oil furnace use?Electric furnaces and heat pumps typically need 15,000 watts or more to run and cannot be powered by a portable generator. Is your hot water heater electric, gas, or oil fired? Gas or oil fired heaters use less power – as little as 2500 watts.Also Know, does an oil furnace work in a power outage? These appliances do not require as much electricity as an electric boiler, furnace, or baseboard, but they still cannot function without power. Oil-fired and gas-fired furnaces, boilers and space heaters produce heat by burning fuel oil or natural gas. So what to do in the event of a power outage? Also to know is, how many amps does a furnace draw? The exact amps an electric furnace requires is solely based on the size of the furnace and its performance capabilities; however, typically electric furnaces require a draw between 60 and 80 amps. By multiplying the volts by amps you will receive total wattage.How much does it cost to run an oil furnace?Costs for an oil furnace that run at a maximum efficiency rate of 80 percent are higher with the average cost of the furnace itself at $2,000 and the installation at $6,000.