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 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 onto the drain outlet of the scrubber unit. 888/570-1376; www.thawtech.com.