Wireless Thermostat for Electric Water Heaters FACTORY CLOSEOUT-Retrofits all previously installed 220 VAC electric water heaters in the US and Canada. Not for installation on newer factory-installed models with digital, energy saving features. Four one-touch settings: ON-AWAY-VACATION-PROGRAM Easily installs in less than one hour. 2-way wireless communication up to 100 feet. SAVES ENERGY allowing homeowner to control operation of electric water heater.