FBW200: 120 Volt – 280 Watts – Max Temperature 110°F (± 10°F). 200 board foot box. Powerblanket® has changed the conventional method of transferring heat to temperature sensitive materials. The revolutionary design of Powerblanket foam box heaters provides uniform heat to spray foam systems, eliminating any hot and cold spots. Powerblanket products provide a maintenance free heating solution, which eliminates the headache of maintaining critical temperatures. If stored properly, spray foam systems will last longer and be more effective. In turn, this saves time, hassle, and money.