Quick Answer: Why Are There Two Thermostats On A Hot Water Heater?

Should both thermostats on water heater?

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..

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 families needs running on just the top element.

Can you replace thermostat on hot water heater?

Most electric water heaters made today use a dual element system. … For each element, the unit requires a matching thermostat, so dual element units have two thermostats, and single element models only one. When replacing one thermostat, it is a good idea to go ahead and replace both the upper and lower thermostats.

How many thermostats are in a hot water heater?

two thermostatsEach electric water heater has two thermostats, one for each element. If one of the thermostats fails to work, the water will not heat as efficiently. Typically, the lower thermostat handles most of your water heating requirements. When you need higher amounts of hot water, the upper unit kicks in.

How does the thermostat work on a hot water heater?

The thermostat is a thermistor that responds to heat by producing a small electric current. The current increases when water temperature increases, and drops when temperature drops. Changes in the electric current cause gas control to turn ON and OFF. When gas control turns ON, it releases gas to burner.

Can a thermostat go bad on a hot water heater?

Usually, when the upper thermostat goes bad, you will have no hot water at all, while a bad lower thermostat makes itself known when there is only a small amount of hot water before the tap water goes cold. … Once you have determined the faulty thermostat, you can replace it and have your hot water heater working again.

How hot is too hot for water heater?

120 degrees FahrenheitThe Consumer Product Safety Commission (CPSC) recommends setting the water heater at no more than 120 degrees Fahrenheit (49 degrees Celsius) to prevent scalding. Not to mention, a water heater that is set too high can unnecessarily increase your electricity bill.

How do you fix a thermostat on a hot water heater?

How to Troubleshoot a Defective Thermostat on An Electric Water HeaterHead to the circuit breaker and turn off the power to the thermostat. … Pull out the two panels that protect the thermostat. … Locate a plastic panel on the thermostat and heating element. … Check for a “snapping” movement as you push the button.More items…

Why does my hot water heater only have one element?

A dual element water heater is a two thermostat system, an upper and lower, that heats water in its tank one element at a time. … Only one heating element will be active at any one time. Water is more evenly heated in this system, which is now the most common in homes built today.

How much does it cost to replace a hot water heater thermostat?

The average thermostat replacement cost is between $100 and $300. Most other repairs are equally affordable. There are two main types: gas and electric. A gas unit works by way of a gas flame while an electric one works using electric elements, or coils.

Will 110 degree water burn you?

Safety concerns That said, a mere 10-minute exposure to water this hot can result in third degree burns. For adults, a water temperature of 106 to 108° F (41 to 42° C) gets into pain threshold territory. Bath fans might argue that it’s safe to hop into a scalding tub because it cools down so quickly.

Is 150 too hot for water heater?

The recommended setting for household water heaters is not 150 degrees, but slightly less _ 140 degrees. … Water temperatures higher than 140 degrees can burn the skin and are particularly dangerous for young children and the elderly.

What happens when a heating element goes out in a water heater?

When an electric hot water heater’s elements short out or burn through, cool water is the result. Typically, the lower element goes first, but that’s not always the case. Fortunately, a few quick electrical tests reveal which element you must replace in order to restore hot water to your home.

What causes a heating element to burn out in a water heater?

The most common cause of burned out elements on new water heater installations or new element replacements is DRYFIRE. This happens because the installer fails to open a hot water faucet while the heater tank is filling with water and therefore purging or bleeding air from the system.

Is 140 too hot for water heater?

Professionals recommend keeping your water heater set at a temperature between 130 and 140 degrees Fahrenheit. Any higher, or lower, could actually be dangerous for you and your family. While turning the temperature up higher can result in burns, turning it lower than the recommended setting can also be dangerous.

How long do water heater thermostats last?

between 6 to 13 yearsYour system is old: On average, your hot water heater should last anywhere between 6 to 13 years.