Tank heater link:
https://www.amazon.com/Diamond-Group...kit+-+6+gallon
Water bypass valve .
RV – Aqua View, Inc.
Since that worked so well I went to Home depot and bought the same type of breaker to hook up on the gas side of the tank. Takes some testing to get the right temperature but I think I have it now.
https://www.homedepot.com/p/Everbilt...1695/204834403 looking back, no reason you cant use this thermostat on your current electric heater, just run the wires through the thermostat and save buying the optional kit I listed.