Heatco flanged immersion heaters are available in a wide selection of flange sizes and with a variety of electrical enclosures.Pipe insert or bayonet - indirect heat to viscous materials such as those found in food manufacturing,Circulationin-line - fast-acting, low-wattage applications such as engine preheating, Screw plug - fluids such as in rinse tanks, chemical baths and caustics Heating elements are also manufactured in a flat tubular configuration or a round tubular design.