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The Heatworks MODEL 1X connects to any tank-type water heater to give you at least 50% more hot water. Simply plumb it in between the outlet of your tank heater and your hot water piping. Use your existing electrical circuit to power the MODEL 1X, and then run your tank heater wiring to the MODEL 1X power controller.
Depending on your tank style and incoming water temperature, you'll have at least 50% more hot water for successive or longer showers.