Does A Rheem Water Heater Have Two Thermostats? (Explained)

By - Rajib Ahmed

Updated -

Rheem water heaters are popular for many households due to their reliability and efficiency. 

They come in various sizes and can be used to meet the needs of different households. However, it’s essential to know the specifics of your Rheem heater, such as whether or not it has two thermostats. 

The reason is that it helps you ascertain its capability and control it more efficiently. This prompts most users to question the availability of dual thermostats in rheem heaters.

Some Rheem heaters nowadays come with two thermostats that work together to control the water temperature in your tank. The first is the upper thermostat, while the other is the lower thermostat. With these two thermostats, you can easily adjust the temperature of your hot water to suit your needs.

This article discusses the science and occurrence of dual thermostats in your rheem heater. 

By the end, you’ll better understand how your Rheem water heater works and if having a dual thermostat benefits you.

Which Rheem Water Heaters Have Two Thermostats?

Does a Rheem Water Heater Have Two Thermostats

Dual-element configuration rheem heaters consist of two thermostats. 

You’ll often find this setup commonly in large-capacity models(50 gallons and more) where there’s usually high demand for hot water.

Fortunately, rheem offers a few models of tank-type heaters that feature two thermostats. 

A few include the Rheem Marathon Electric Water Heater (50+ gallons) and Rheem Performance Platinum Electric Water Heater (50+ gallons).

In the dual thermostat Rheem Marathon Electric Heater, the upper thermostat controls the temperature of the upper element.

The lower one, on the other hand, controls the temperature of the lower element. Both thermostats are adjustable and can be set to the desired temperatures.

Similarly, the rheem platinum features the same makeup as the rheem marathon. 

But besides the two thermostats for precise temperature control, it has a durable stainless steel tank and an insulated jacket to reduce heat loss and energy consumption

It also includes an adjustable temperature range from 80°F to 140°F and can provide up to 9,500 watts of power.

Overall, dual thermostats provide greater control over the temperature of hot water. And if you want an effective heater with dual thermostats, choose from above mentioned.

They ensure that the water heater only uses the energy necessary to maintain the desired temperature. This helps to reduce energy costs and prevent overheating. 

Additionally, dual thermostats, in general, provide an extra layer of safety by providing automatic shut-off when temperatures exceed a certain level. 

They provide precise temperature control by allowing users to adjust the temperature settings on both sides of the water heater.

Are Dual Element Rheem Water Heaters Energy Efficient?

Dual Element Rheem Water Heaters provide energy-efficient hot water solutions for residential and commercial applications. 

They feature two heating elements that heat water quickly and evenly, saving energy and money. 

The first element is usually a high-wattage element that heats the water quickly, while the second is a lower-wattage element that maintains the set temperature. 

This allows for more efficient energy use as it only requires the higher wattage element to turn on when more hot water is needed instead of constantly running at full power.

The dual-element design also helps reduce hot water recovery time, saving even more energy over the heater’s life.

To furthermore emphasize energy efficiency, the dual-element heaters feature temperature sensors that detect when the hot water has cooled down and automatically turn it back on to reheat.

This makeup helps reduce energy waste and ensures your hot water stays at an optimal temperature without having to monitor it yourself constantly.

On the other hand, single-element heaters are less energy efficient due to their limited capacity to maintain a consistent temperature. 

They usually cannot evenly distribute hot water throughout a household, leading to wasted energy. 

The lack of insulation also causes them to be less conservative as they lose more heat through their walls. 

Likewise, there’s a higher risk of overheating since they have one thermostat to regulate the temperature. 

In contrast, most rheem dual-element heaters have an insulated tank that helps retain heat and improve proficiency.

Most of all, dual-element rheem heaters have the certification of the Energy Star

This achievement displays their energy efficiency, making them an excellent choice for saving on their monthly utility bills.

Should the Two Thermostats on Your Rheem Water Heater Have the Same Setting?

It’s generally recommended that both thermostats be set to the same temperature to ensure proper operation and efficient energy use. 

However, depending on your specific needs and preferences, you may adjust one or both of them differently.

Setting both thermostats at the same temperature ensures that your heater operates adequately and safely. 

But this doesn’t necessarily mean adjusting them to the same configuration will blow up the system.

Below are some upsides and downsides to setting different temperatures and similar temperatures.

Similar thermostat settings:

Upsides Downsides 
It reduces overheating riskUneven heating of the water, resulting in hot spots and cold spots
It’ll help extend its lifespan as it won’t be subject to uneven heating and cooling cyclesInefficient use of energy as                                   the heater will run for more extended periods
Reduced noise commotion during operation Undesired results after wasting a lot of time

Disparate thermostat settings:

Upsides Downsides 
It allows you to customize the hot water temperature for different applicationsIncreased energy consumption
It helps you save energyA decrease in the lifespan of the heater may result 
It allows you to control the temperature of hot water more preciselyDecrease in the efficiency of the system 

Notwithstanding, it’s important to note that the two thermostats shouldn’t be set too high, as this can cause damage to the heater and increase energy costs.

Likewise, activating an extremely low-temperature configuration isn’t safe because one thermostat can overheat and cause damage or malfunction to the other. 

If the temperatures should differ, ensure that the settings are within the specified range for each thermostat. You can consult your manual for the specific range of each one. 

Additionally, if you need clarification about anything in the process, feel free to contact a professional technician or reach out to Rheem’s customer service.

Do the Two Thermostats on a Rheem Water Heater Have the Same Function?

The two thermostats on a Rheem water heater have disparate and distinctive functions. The upper thermostat is responsible for controlling the temperature of the tank water. 

It works by sensing the temperature of the water and then turning on or off the upper heating element to maintain a specific temperature. 

When the thermostat is set to a higher temperature, it will turn on for extended periods to heat the water. 

But if configured to a lower temperature, it will turn on for shorter periods to cool down the water. 

The upper thermostat also has an adjustable range which allows users to adjust their desired hot water temperature.

On the other hand, the lower thermostat maintains the water temperature in the tank at a set level. 

It works by sensing the temperature of the water and then turning on or off the lower heating element to maintain that temperature. 

When the thermostat senses that the water has reached the desired temperature, it’ll deactivate the heating element. 

It’ll only activate the element when the temperature has dropped below a certain threshold. This process continues until you manually adjust or turn off your heater.

In summary, the upper thermostat is responsible for the upper and lower elements. 

It senses the water temperature, activates the upper element, and deactivates after the heating, handling over to the lower thermostat.

The lower thermostat then takes over the heating and controls the lower heating element. Both thermostats work together to ensure your water heater maintains its desired temperature.

How Can I Tell How Many Thermostats My Rheem Water Heater Has?

Knowing how many thermostats your Rheem water heater has is vital for ensuring proper operation and maintenance. 

However, it’s challenging to ascertain accurately by merely looking at the heater. The best option is to consult your user manual and review the specifications or system design.

But if you can’t find the manual, you’ll need the heater’s serial and model numbers. 

Once you have these numbers, you can access their site and look up the specifications for your particular model. It’ll point out the number of thermostats present.

Another alternative is opening the access panel and inspecting the internal components

The access panel is typically located on the side of the water heater and provides access to the unit’s interior components.

Using a screwdriver, safely unscrew the bolt, remove the panel, then start your inspection(identify the thermostats). 

It’s crucial to ensure that all safety precautions are in place. Be sure to disconnect the heater from the mains and ensure there’s no source of power.

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