Keep the liquid inside your hose from freezing, maintain your liquid’s viscosity, and prevent condensation in chilly environments. Also known as heat blankets, these heaters wrap around your hose to warm the contents quickly without direct contact. They’re insulated with fiberglass, so they retain heat even in unheated and drafty areas. Do not use these heaters near combustible gases or dust.

Heaters with an adjustable thermostat let you fine-tune the heat output, so they’re best if there are surrounding temperature changes or you want the liquid in your line to be at a certain temperature. For instance, if a liquid needs to be at a certain temperature to mix well, you can adjust the heat output on the digital keypad as needed. These heaters automatically turn on or off to keep your hose consistently warm.

Heaters with self-regulating temperature control work well when all you need is freeze protection and to prevent condensation. Just plug them in and they start heating—no fussing with a thermostat or temperature controller. They automatically adjust the heat output to account for temperature differences along the length of the heater. For instance, if a hose runs both indoors and outdoors in the winter, these heaters will output high heat to the section that runs outdoors and less heat to the section that runs indoors.