How to Set the Upper & Lower Thermostats on Dual Element Water Heaters
Hot water heaters may have a single element near the middle of the tank or dual elements located near the top and bottom. The elements heat from either electricity or gas to warm the copper element in the tank and the surrounding water. The hot water flows into a home through the plumbing and release into a sink or shower when a faucet valve is turned on. Each element has an adjustment knob or digital keypad to change the temperature of the thermostat.