Why does an electric water heater have two thermostats?

It controls both the upper and lower elements. A thermostat is essentially a temperature-activated switch. … Most electric water heaters above 20 gallons have two thermostats that sense the temperature of the water in both the top and bottom of the tank.

Should both thermostats on an electric water heater be set the same?

The majority of electric water heaters have two thermostats: an upper and a lower, located under two control panels. To ensure your electric water heater works as efficiently as possible, you should set both of the thermostats at the same temperature.

Why do I have two thermostats on my water heater?

A dual-element water heater uses two heating elements controlled by two separate thermostats. The upper element heats the upper portion of the water column. … Depending on your water usage, the temperature can be lowered. This uses less electricity, lowering your electricity bill.

How does a two thermostat water heater work?

The basic operation of a two thermostat system (upper and lower) on an electric water heater of 240 volt supply is as follows: Only one element will come on at any one time. … The lower thermostat switch will close and heat up the bottom portion of the tank until the water is heated to the setting of that thermostat.

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What should water heater thermostats be set at?

The short answer: 120 degrees Fahrenheit. This is the preset thermostat temperature in most new water heaters, and it’s the recommended setting of the U.S. Department of Energy. At this temperature, harmful pathogens like the kind that cause Legionnaires’ disease are prevented from multiplying and may be killed.

What temperature should electric water heater be set on?

120 degrees Fahrenheit is the safety recommendation against scalding, but 140° is the common default setting. Most experts agree that anything below 120 degrees creates a risk for bacteria to develop inside your water heater from stagnant water, such as legionella that causes Legionnaire’s disease.

Why must a new or replacement immersion heater not include two thermostats?

Be aware !! From April 2004, new and replacement Immersion Heater Thermostats need to incorporate an overheat safety cut-out so that if the water thermostat fails, the water in the cylinder will not overheat which could cause scalding water to come out of the taps.

Can a thermostat go bad on a hot water heater?

Upper Thermostat Failure – If your upper thermostat (or heating element) is defective, then the water heater will stop heating water entirely. … Lower Thermostat Failure – If your lower thermostat (or heating element) is defective, you’ll either notice the hot water is lukewarm or the hot water quickly runs out.

Are all water heater thermostats the same?

No, all water heater thermostats are not universal. There are some variances in thermostats between single element water heaters and dual element water heaters. Also, in dual element water heaters, there is a difference in the upper and lower thermostats.

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Do electric water heaters have 2 elements?

Electric tank water heaters have been around for a long time, but dual-element models take a slightly different approach. … With a dual-element water heater, there are two heat elements – one on the top and one toward the bottom of the tank. Each element has its own thermostat, and only one element runs at a time.

Do all water heaters have 2 elements?

Most residential electric water heaters have two heating elements: one near the top of the tank and one near the bottom. Power enters the top and runs to the high-temperature cutoff switch, and then to the thermostats and elements. The top and bottom elements are controlled by separate thermostats.

What is the advantage of a twin element hot water system?

Advantages. The dual element is the more efficient of the two water heating systems. It heats water quicker than a single element unit, as water is moved from one end of the tank to the other, whereas a single element system heats from the bottom up only.

Does turning up water heater make hot water last longer?

Turn up the thermostat on the hot water heater. One of the easiest ways to make a hot shower last longer is by using less hot water while it’s at a higher temperature. To do this, turn up the temperature on the thermostat that’s attached to the hot water heater tank.