How much power can this control? Will it switch a 1000W heater On/Off?

Hello Valued Customer, thank you for your question. This device is not necessarily designed for heaters, and should not be used to control any devices that contain heating elements. We recommend using this to control lighting devices that fall within these ratings: 120V/60Hz, 15A Resistive load, or 1800W Resistive/general purpose. If you have any further questions, please don’t hesitate to respond or give us a call between the hours of 7:00 AM – 8:00 PM Central Standard Time, Monday thru Friday at 1-800-654-8483, and press option 4. Please refer to your ticket number (600631) if you decide to give us a call. Thank you.