depressed concurrently each of the timing modules 64 and 66 is locked out and no operation of the device is effected thus each control button 28 and 29 when depressed terminates operation of the other mode i e if the device is operating in a water delivery mode depressing of the heater pushbutton 29 terminates the delivery of water and initiates an air drying operation or where the device is operating in an air drying mode depression of the water pushbutton 28 discontinues energization of the blower motor 47 and blower heater 49 and initiates a water delivery timed cycle at the end of each of the timed cycles controlled by the modules 64 and 66 the modules reset permitting subsequent operation of the device by depression of either of the pushbuttons as desired the control assumes that the last pushbutton depressed by the user is the one which the user intends to control the desired operation at that time and thus automatically discontinues the previous mode of operation in the event the control is operating in such opposite mode in the event either of the pushbuttons is jammed in upon completion of the initial timing operation no further operation of the device can be effected until the pushbuttons are released for normal operation as discussed above the present invention provides means to effectively preclude energization of the electric water heater until the warm water tank is filled with water upon initial installation of the device in a presently preferred form of the invention the means comprises a single pole double throw switch 90 connected to line l1.