Turn the dial to control the percentage of time that these heaters cycle on, from 5% to 100%. Commonly used to thaw pipes, prevent valves from freezing, and heat beakers and flasks in labs, they're good for temporary and occasional use where rapid heating is required but precise temperature control is not.

These heaters require a separate temperature switch or controller to regulate heat output.

Rated for a maximum heat output of 900° F, these heaters are often used for thawing frozen pipes and rapid spot heating.