4 ms·

If you’ve got a 240v water heater that is on a 40A or smaller breaker, this would work: https://www.intermatic.com/Catalog/us/Products/Timer-Controls/Mechanical

If you’ve got a 240v water heater that is on a 40A or smaller breaker, this would work: https://www.intermatic.com/Catalog/us/Products/Timer-Controls/Mechanical-Time-Switches/T104 https://www.intermatic.com/Catalog/us/Products/Timer-Control... If it’s larger than 40A @ 240V, you could buy a 120v astronomical time clock switch and use the output of that as the input to a 120v control coil for a contactor sized for your water heater.

bokohut 2y ago
Per @quickthrowman recommendation I can add that this is the way to go for an electric hot water heater having installed many of these Intermatic time clocks. The old ones were analog and one can hear a clicking but they do make them digital now, YMMV.