The upper thermostat has a single pole double throw switch to the lower one so both elements can’t be on at the same time. If it’s happening, then the upper thermostat is either wired wrong or it’s somehow defective.

## Do both water heater elements come on at the same time?

Only one element will come on at any one time. This is known as a flip/flop system. On a 240 volt water heater, there will always be 120 volts to both elements. The thermostat will direct the second leg of the 120-volts to the element to complete the 240 volts required to energize the element.

## Should both elements on a hot water heater be set the same?

If you set them to the same temperature, the bottom element will be the first one on every time, and frequently the only one used to maintain the temperature. If you set the top element too much higher, then it will be used most of the time, and the bottom element acts more as a pre-heater.

## Why is there two elements in a hot water tank?

Benefits of a dual element water heater
Having two heating elements that run independently, dual-element water heaters are typically more energy-efficient than their single-element counterparts. Using less electricity can help lower your monthly energy bills and be better for the environment.

## Which element should come on first in a water heater?

When a hot water faucet is turned on, hot water will be drawn off the top of the tank. The thermostat for the lower element is activated by this cold water near the bottom of the tank. The lower element will start to heat the water.

## Will a hot water heater work with only one element?

So, can you run a water heater with only one element? Yes, a water heater can still run if the bottom element quits. However, the water heater won’t run efficiently and likely won’t produce enough hot water to satisfy your family’s needs running on just the top element.

## How does a double element non simultaneous water heater work?

Non Simultaneous Operation – Double Element Water Heaters
When tank is filled with cold water, or tank runs out of hot water, the upper thermostat will demand heat and turn on the upper heating element. Cold water enters the bottom of the tank through the dip tube. 2. The water in the top of the tank is heated.

## Are upper and lower water heater elements the same?

Upper and lower heating elements are identical, and the temperature is regulated by the upper and lower thermostat and high limit device. Electric water heater elements can be different in size, but the most common is 12″ (300 mm).

## What is the difference between a single element and twin element hot water system?

Single element systems are likely to have two off peak heating cycles. One in the middle of the day and one in the middle of the night. Twin element hot water systems will be supplied with both off peak electricity and continuous tarriff electricity.