Industrial valve and scrubber heaters from Thaw Tech are 450 watt, 110 volt and can be used in both stationary and mobile applications. Made of durable 6061 aluminum, the heaters are explosion-proof and provide direct contact with the fluid. Valve heaters install between the flanges behind the butterfly valve, while scrubber heaters are threaded and screw on to the drain outlet of the scrubber unit. 888/570-1376; www.thawtech.com.