Watlow Industries Share: Manufacturers & Industries Watlow Industries Visit Website 6 Industrial Loop Road Hannibal, MO 63401 (573) 221-2816 (573) 221-7023 (fax) Hours: 8 AM to 5 PM About Rep Info About Watlow designs and manufactures industrial heaters, temperature sensors, controllers and supporting software, as well as assembles all of the components of a thermal system. Whom to Contact Jana Yarrington