Infratech 14-4225 Infinite Input Regulator Assembly
Exterior, Surface-Mount, Load Control for two W1524, W2024; W3024, SL2424, SL3024; or WD3024 patio heaters, 240 or 208 volts, 1500 - 3000 watts.
(Optional 14-4125 is for two W-1512, 120 volt, heaters.)
It is also possible to economically control one WD4024, WD5024, or WD6024 heater with this control. (Electrician: Bring four wires (plus ground) from the control to the patio heater.