This dual 240 volt duplex control works with the three Infratech WD (Dual element) Series heaters: WD4024SS, WD5024SS, or WD6024SS (208 Volt versions included). The dual waterproof in-wall assembly is suited for outdoor areas. The duplex control works by allowing control of each element individually, thus resulting in either 50% Output or 100% output. Duplex switch Assembly for WD4024, WD5024 and WD6024 dual element heaters Intended for exposed exterior locations Stainless steel plate Allows on/off and 50% power control 50% Output or 100% output Waterproof cover closes to conceal and protect controls from elements No assembly required 1 Year warranty. Warranty: One Year / Current(Amps): 20.