Bi Metal Heating elements for Roll And Glow Heaters. Located inside the black metal housing in the top section. The heater unit is attached to the blower fan by four screws. Replacement heating elements have THREE wires. A white neutral that goes to the control board, and two blue wires that connect the safety switch to the control board. The 750 watt heater wires are connected to it in the same place as before. This element was not back manufactured for use in 2007 & 2008 models and WILL NOT WORK. Some 2009 models have the same issue. To check for adaptability check your heater core. If it has 4 wires, yours is a 2007, 2008 or 2009 model. Please see REPAIR and UPDATE KIT number HS201. We ship ONLY Genuine Heat Surge Heating Elements.