There are different size heating elements based on diameter and wattage for the various burners manufactured by INOV8. The standard size for the INOV8 waste oil burner model S200 is 3/8" x 9" x 800 watts. Older burners have a 1/4" x 9-1/2" x 600 watts heating element. The larger burner S700 has a 19" heating element with 1300 watts and comes in 60 or 50 hertz. The gas-oil burner uses a 3/8" x 5" x 600 watt element.