There are two common ways to do this; both include thermostat and a sensor. The sensor goes in the thermal well of your vessel and the controller will be tied in either to a solenoid valve, which open and closes based off temperature that the thermostat is reading, or an actuated ball valve that is just an on or off when it receives power. When it receives power it opens and closes when it loses power. Both are very viable ways to ensure you’re maintaining constant temperature in your tanks. Contact Us