Hazardous-location portable electric heaters have permanently sealed parts to prevent sparking while heating potentially hazardous locations. They can be used where flammable gases, vapors, powdered metals, or dust is present. These heaters are mounted on a lightweight aluminum portable cart so they can be moved wherever extra heat is needed. They are factory wired for direct plug-in and have a cast aluminum Killark male/female connection. These heaters come with a built-in thermostat.