Depending on your application, there are a variety of different models to chose from. For smaller applications, screw plug heaters are useful for their low cost and ease of replacement. For larger applications flanged heaters are used for their ability to handle high loads of power and larger volume of liquids. For applications that require elements from the top of a container, over the side heaters are selected. Each product has the option of coming with a mechanical thermostat or a digital controller for more precise temperature requirements. Standard NEMA 1 terminal housing is always available, NEMA 4 moisture-proof and NEMA 7 explosion proof housing for more volatile environments.