Powerblanket Foam Cylinder Heater - 15" D Insulated Top/Hood. Powerblanket has changed the conventional method of transferring heat to temperature sensitive spray foam systems. 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. The Powerblanket FCW15H improves the efficiency of the Foam Cylinder Heater by using an insulated hood to prevent heat from escaping. In turn, this saves time, hassle, and money.