Diesel Exhaust Fluid (DEF) is one of the key components used to meet emissions regulations for diesel engines. In order for DEF to work effectively, it needs to be stored at temperatures between 12º and 90º F. In colder temperatures, it’s crucial to find an effective storage and heating solution for DEF. Powerblanket® has the answer. Our patented heating blankets take the hassle out of DEF storage heating. Powerblanket DEF tote heaters save you time, money, and energy.