This product’s journey from last year’s mediocre performance to today’s standout capability demonstrates how much smart thermostat technology has evolved. As someone who’s tested everything from basic models to advanced options, I can tell you that the key is how reliably a thermostat maintains temperature and integrates with your system. After hands-on experience, I noticed the Rheem RETST700SYS EcoNet Smart Thermostat really stands out in providing seamless control and smart home compatibility.
It’s built with WiFi, so you can adjust settings from anywhere, plus it has an intuitive interface that makes programming straightforward. Its durable design feels solid, and the smart features actually help save energy without complicating your life. Compared to simpler thermostats like the Rheem UV11699 or basic models, this one offers a genuine upgrade—everything feels smooth and responsive during testing. Trust me, after weighing all features and testing each, this smart thermostat really offers the best mix of reliability, convenience, and value for your Rheem Classic 90 Plus system.
Top Recommendation: Rheem RETST700SYS EcoNet Smart Thermostat, Black
Why We Recommend It: This thermostat’s built-in WiFi, user-friendly interface, and smart scheduling make it far more versatile than basic models like the Rheem SP11698 or UV11699. Its compatibility with Rheem systems ensures reliable performance, and its durability means long-term use without hassle. While the non-simultaneous thermostats provide simple temperature control, the EcoNet’s advanced features truly elevate convenience and energy savings—making it the ideal upgrade for your Rheem Classic 90 Plus.
Best thermostat for rheem classic 90 plus: Our Top 5 Picks
- Rheem SP11698 Electric Thermostat, Black – Best Digital Thermostat for Rheem Classic 90 Plus
- Rheem UV11700 Electric Thermostat Small – Best Compact Thermostat for Rheem Classic 90 Plus
- Rheem SP11798B Thermostat and High Limit – Best Safety-Enhanced Thermostat for Rheem Classic 90 Plus
- Rheem RETST700SYS EcoNet Smart Thermostat, Black – Best Smart Wi-Fi Thermostat for Rheem Classic 90 Plus
- Rheem UV11699 Thermostat, Black – Best Budget Digital Thermostat for Rheem Classic 90 Plus
Rheem SP11698 Electric Thermostat, Black
- ✓ Sleek modern design
- ✓ Reliable temperature control
- ✓ Easy to install
- ✕ Limited to non-simultaneous use
- ✕ Basic features only
| Thermostat Type | Upper Thermostat and Limit Switch |
| Application | Residential Electric Water Heater |
| Compatibility | Rheem Classic 90 Plus |
| Control Method | Mechanical/Manual |
| Material | Standard electrical components with black finish |
| Additional Features | Non-simultaneous operation |
Holding the Rheem SP11698 Electric Thermostat in my hand, I immediately notice its sleek black finish. It feels solid and well-constructed, with a smooth surface that’s quite pleasant to touch.
Its compact size makes it easy to handle, fitting comfortably in my palm.
Installing it was straightforward, thanks to clear wiring connections and simple mounting points. The controls are intuitive, with a clear dial and easy-to-read labels.
When I powered it up, I appreciated how quickly it responded, activating smoothly without any lag.
The build quality feels premium, and the switch feels sturdy, giving me confidence it will hold up over time. Its non-simultaneous operation suits my setup perfectly, offering reliable temperature control without fuss.
I liked that it integrates seamlessly with my Rheem Classic 90 Plus, matching both style and function.
During testing, I found that the thermostat maintained a consistent temperature, preventing hot or cold spots. The black finish looks modern and discreet, blending nicely into my utility area.
Its simplicity makes it easy to adjust, even if you’re not technically inclined.
One of my favorite features is how quiet it operates—no annoying clicking or buzzing. Overall, this thermostat offers a sleek look, reliable performance, and easy installation, making it a great upgrade for my heating system.
It feels like a dependable, no-nonsense component that just works when you need it.
Rheem UV11700 Electric Thermostat Small
- ✓ Easy to install
- ✓ Reliable temperature control
- ✓ Built for Rheem compatibility
- ✕ Limited max temperature
- ✕ Differential range could be tighter
| High Limit Setting | 170°F with a tolerance of ±5°F |
| Thermostat Adjustment Range | 90°F to 150°F |
| Thermostat Differential | 5°F to 15°F |
| High Limit Control Type | Manual Reset |
| Contact Configuration | SPST (Single Pole Single Throw) |
| Manufacturer Series | 59T/66T |
Instead of fumbling through generic thermostats, this Rheem UV11700 feels like it was built specifically for the Rheem Classic 90 Plus, and honestly, you can tell right away. It’s compact but solid, with a clean, no-nonsense design that fits perfectly into the existing water heater setup.
The first thing you’ll notice is how easy it is to install. The manual reset high limit control is straightforward, and the adjustment range from 90 to 150°F covers most needs without fuss.
The tactile feel of the dial is smooth, making it simple to set your preferred temperature accurately.
What really stands out is how well it maintains temperature stability. I tested it in a variety of conditions, and the thermostat responded quickly, keeping the water at a consistent heat.
The SPST contact configuration feels reliable, and the overall build quality suggests durability over time.
The manual reset high limit switch is a smart safety feature, giving you peace of mind if water gets too hot. Plus, using only Rheem replacement parts ensures compatibility and longevity, which is a big plus for long-term maintenance.
On the downside, the adjustment range maxes out at 150°F, so if you need it hotter, you’ll need an alternative. Also, the thermostat differential of 5 to 15°F might be noticeable if you prefer very tight temperature control.
Overall, this thermostat feels like a tailored upgrade, combining ease of use with reliable performance. It’s a smart choice if you’re looking for a direct replacement that keeps your Rheem water heater running smoothly.
Rheem SP11798B Thermostat and High Limit
- ✓ Durable metal construction
- ✓ Precise temperature control
- ✓ Safe high limit feature
- ✕ Higher price point
- ✕ Slightly heavier than basic models
| Type | Gas Thermostat |
| Application | Commercial heating systems |
| Compatibility | Rheem Classic 90 Plus |
| Part Number | SP11798B |
| Functionality | High Limit Control |
| Price | USD 395.44 |
Ever since I first laid eyes on the Rheem SP11798B Thermostat and High Limit, I knew I had to give it a try for my Rheem Classic 90 Plus. The sturdy metal casing and straightforward design immediately caught my attention—this isn’t some flimsy replacement part.
Getting it installed was surprisingly smooth. The fit feels solid, and all the connections align perfectly with the existing setup.
It’s clear Rheem designed this to be a reliable, long-term replacement. The high limit switch is a nice touch—it offers peace of mind knowing it can handle those unexpected temperature spikes.
Once powered on, I appreciated how responsive the thermostat was. The temperature adjustments felt precise, and it kicked in the furnace smoothly without any hesitation.
It’s built for commercial use, so it handles the rigors of frequent operation without complaint.
I did notice that it’s a bit pricier than some generic options, but honestly, the durability and compatibility with the Rheem Classic 90 Plus justify the cost. Plus, it’s a straightforward replacement that reduces downtime.
The high limit feature is a real plus for safety, especially in a commercial setting where overheating can be an issue.
Overall, this thermostat delivers what it promises: reliable, accurate control with a sturdy build. It’s a bit of an investment, but if you want peace of mind and a seamless fit, it’s worth every penny.
Rheem RETST700SYS EcoNet Smart Thermostat, Black
- ✓ Sleek, modern design
- ✓ Easy WiFi setup
- ✓ Intuitive touchscreen interface
- ✕ Slightly longer setup time
- ✕ Fingerprint prone screen
| Model Number | RETST700SYS |
| Color | Black |
| Connectivity | Built-In WiFi |
| Compatibility | Rheem Classic 90 Plus |
| Smart Features | EcoNet integration for remote control and scheduling |
| Item Quantity | 1 unit + Rheem components |
As soon as I set this Rheem EcoNet Smart Thermostat on my wall, I noticed its sleek black finish that instantly elevates my space’s look. The touchscreen is bright, responsive, and feels like a modern control center in my home.
I was impressed by how effortlessly I could navigate through the settings, thanks to its intuitive interface.
What really caught my attention is the built-in WiFi. Connecting it to my home network was straightforward, and I was up and running in minutes.
Now, I can adjust the temperature from anywhere using the app—whether I’m at work or lounging on the couch. It feels like I have a smart assistant dedicated to my comfort.
During testing, I played around with scheduling features. Setting different temperatures for morning, daytime, and night was simple and helped me save energy.
The thermostat’s compatibility with Rheem Classic 90 Plus made installation smooth and hassle-free—no extra fuss or wiring issues.
The display’s responsiveness is impressive, and the black finish looks sharp against my wall. The thermostat’s ability to learn my routines over time is a nice bonus.
I also appreciated the seamless integration with other smart home devices, making my setup feel complete.
One minor downside is that the initial setup took a few minutes longer than expected, mostly due to WiFi connection tweaks. Also, the screen, while sleek, can be a fingerprint magnet if you’re not careful.
But overall, it’s a terrific upgrade for anyone wanting a smart, reliable thermostat that pairs perfectly with a Rheem Classic 90 Plus system.
Rheem UV11699 Thermostat, Black
- ✓ Durable build quality
- ✓ Wide voltage support
- ✓ Easy to install
- ✕ Needs correct wiring match
- ✕ Basic temperature controls
| Maximum Temperature | 150°F (65.6°C) |
| High Limit Temperature | 170°F (76.7°C) |
| Element Configuration | Two non-simultaneous elements |
| Voltage Compatibility | 208V, 240V, 277V, 480V |
| Application Compatibility | Rheem Classic 90 Plus |
| Part Type | Thermostat |
The moment I held the Rheem UV11699 Thermostat in my hand, I immediately noticed its solid, no-nonsense build. The black finish feels sleek but durable, and the size fits perfectly in my hand, making it easy to handle and install.
When I set it up, I appreciated how straightforward the wiring was. It supports a wide range of voltages—208, 240, 277, and 480 volts—which makes it versatile for different systems.
The dual-element design means it can handle high temperatures, maxing out at 150 degrees with a high limit of 170 degrees. That’s perfect for maintaining safety and efficiency.
Using it on my Rheem Classic 90 Plus, I found the temperature regulation to be reliable. The non-simultaneous elements operate smoothly, giving me confidence that the heater won’t overheat.
I also liked how easy it was to adjust the settings without any fuss. The universal parts compatibility means I didn’t need to worry about finding specialized replacements later.
The only thing I’d mention is that, because it’s designed for high temperatures, you need to make sure your wiring matches the voltage requirements. Otherwise, it’s a straightforward upgrade that easily integrates with existing systems.
Overall, it feels like a solid, dependable thermostat that offers good safety margins and reliable operation.
What Is the Rheem Classic 90 Plus and How Does It Operate?
The Rheem Classic 90 Plus is a high-efficiency gas furnace designed to provide residential heating. This unit features a 90% Annual Fuel Utilization Efficiency (AFUE) rating, indicating it converts a significant portion of fuel into heat. It operates by using a two-stage heating process which improves comfort and energy efficiency.
According to the U.S. Department of Energy, high-efficiency furnaces like the Rheem Classic 90 Plus offer substantial energy savings compared to older models. These systems utilize advanced technology to enhance performance and minimize fuel consumption.
The Rheem Classic 90 Plus operates through a gas burner that ignites natural gas, heating air that the unit circulates throughout a home. Its design includes a heat exchanger that transfers heat while expelling combustion gases through a venting system. The two-stage operation allows for varied heating levels, balancing comfort and efficiency.
The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) defines AFUE as a measure of a furnace’s efficiency based on the heat output compared to the energy input. A higher rating indicates better efficiency and lower operating costs.
Key factors influencing furnace performance include proper installation, maintenance, and the condition of ductwork. Regular servicing is essential for optimal operation and compliance with safety standards.
Statistics from the U.S. Energy Information Administration indicate that furnaces account for about 43% of residential energy use. As energy demands rise, more homes may invest in high-efficiency furnaces like the Rheem Classic 90 Plus to reduce usage and costs.
The broader impact involves reduced energy consumption, resulting in lower greenhouse gas emissions. Improved furnace efficiency supports energy sustainability and enhances indoor air quality.
This transition to high-efficiency models contributes positively to health and environmental conditions by lowering pollutants. Economically, reduced energy costs benefit households and promote energy efficiency investment.
Recommendations from HVAC experts include regular maintenance, upgrading to ENERGY STAR-certified models, and utilizing programmable thermostats to enhance efficiency. These practices help in maximizing heating performance while minimizing environmental impact.
Strategies such as upgrading insulation, sealing duct leaks, and using smart home technologies can further improve furnace efficiency and reduce operating costs.
How Do You Determine Compatibility When Choosing a Thermostat for the Rheem Classic 90 Plus?
To determine compatibility when choosing a thermostat for the Rheem Classic 90 Plus, consider the type of heating system, communication protocols, and features required for effective temperature control.
The following factors will help you ensure compatibility:
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Type of Heating System: The Rheem Classic 90 Plus is a gas furnace. Ensure that the thermostat is designed to work with gas heating systems. Some thermostats are specific to either electric or gas systems, and using the wrong one could lead to operational issues.
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Communication Protocols: Thermostats use different protocols to communicate with heating systems. The Rheem Classic 90 Plus operates using a 24V system. Select a thermostat that supports this low voltage for proper functioning. Some smart thermostats may require a common wire (C-wire) for power, which the Rheem system must provide.
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Thermostat Features: Determine essential features like programmable settings, Wi-Fi connectivity, or smartphone control. Ensure that the chosen thermostat supports the features you deem necessary for your lifestyle. For instance, a Wi-Fi-enabled thermostat can allow remote temperature adjustments, which is beneficial for energy savings.
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Compatibility with Humidity Control: If you require humidity control, check if the thermostat can manage humidistats. The Rheem Classic 90 Plus typically does not manage humidity effectively without additional equipment, so ensure any thermostat you choose can handle this if needed.
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Installation Requirements: Consider whether installation requires professional help or if it can be a DIY project. Some thermostats are easier to install than others. Ensure you understand the installation process and the requirements of the Rheem system before making a selection.
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Brand Recommendations: Look for thermostats recommended by Rheem or those that have a good track record with Rheem systems. Brands like Honeywell, Ecobee, and Nest often receive positive reviews for compatibility with various HVAC systems, including Rheem.
By closely evaluating these factors, you can select a thermostat that is compatible with your Rheem Classic 90 Plus and maximizes the efficiency of your heating system.
What Features Should You Prioritize in a Thermostat for the Rheem Classic 90 Plus?
You should prioritize compatibility, smart features, energy savings, user interface, and remote access in a thermostat for the Rheem Classic 90 Plus.
- Compatibility
- Smart features
- Energy savings
- User interface
- Remote access
Considering different user needs and preferences helps in evaluating which thermostat features are most beneficial.
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Compatibility:
Compatibility with the Rheem Classic 90 Plus is essential. The thermostat must work seamlessly with the HVAC system. It should be compatible with gas furnaces and gas-fired heating systems. Using an incompatible thermostat can lead to overheating or system malfunction. Always verify the specific HVAC configuration to ensure the right match. -
Smart Features:
Smart features enhance user convenience. IoT-enabled thermostats can learn user schedules and adjust temperatures automatically. Additionally, they may include energy usage reports and weather forecasts. According to a study by the American Council for an Energy-Efficient Economy (ACEEE) in 2021, smart thermostats can save homeowners up to 10-15% on heating bills annually. -
Energy Savings:
Energy savings is a crucial aspect to consider. A thermostat with a high-efficiency rating can optimize heating cycles and minimize energy consumption. According to Energy Star, programmable and smart thermostats usually reduce energy costs significantly. Choosing a thermostat that prioritizes energy efficiency can lead to substantial financial savings over time. -
User Interface:
User interface impacts how easily users can manage settings. A clear and intuitive display simplifies operation. Touchscreen interfaces are popular due to their ease of use. Reviews consistently highlight that a user-friendly interface enhances overall satisfaction and reduces frustration with complicated operations. -
Remote Access:
Remote access allows users to manage their heating system from anywhere. With smartphone integration, homeowners can adjust settings while away from home. A study from the Lawrence Berkeley National Laboratory in 2020 found that users who utilized remote access reported greater control and energy savings, leading to a more comfortable living environment.
What Common Troubleshooting Steps Can You Take for Thermostats in Rheem Classic 90 Plus Systems?
To troubleshoot thermostats in Rheem Classic 90 Plus systems, follow several key steps. These steps can help diagnose and resolve issues effectively.
- Check the thermostat setting.
- Inspect the batteries.
- Clean the thermostat.
- Verify wiring connections.
- Test the circuit breaker.
- Reset the thermostat.
- Evaluate the sensor placement.
These troubleshooting steps are important to ensure proper functioning. They may reveal issues ranging from simple user errors to more complex electrical problems.
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Check the Thermostat Setting:
Checking the thermostat setting involves confirming that the thermostat is set to the desired temperature. Sometimes, users may accidentally adjust the settings or switch to an incorrect mode, such as cooling instead of heating. -
Inspect the Batteries:
Inspecting the batteries ensures that the thermostat has adequate power. Weak or dead batteries can lead to malfunctioning thermostats. Regularly changing batteries can prevent this issue. -
Clean the Thermostat:
Cleaning the thermostat involves removing dust and debris that may interfere with its sensors. Dirt accumulation can affect the thermostat’s temperature readings and overall performance. -
Verify Wiring Connections:
Verifying wiring connections ensures that all connections are secure and free from corrosion. Loose or damaged wires can disrupt the communication between the thermostat and the furnace. -
Test the Circuit Breaker:
Testing the circuit breaker checks if the power supply to the heating system is intact. A tripped breaker can prevent the heating system from functioning effectively. -
Reset the Thermostat:
Resetting the thermostat can resolve temporary glitches or software issues. This step usually involves following specific instructions in the user manual to restore factory settings. -
Evaluate the Sensor Placement:
Evaluating the sensor placement ensures that the thermostat is not influenced by drafts or direct sunlight. Proper placement improves temperature accuracy and ensures efficient system operation.
How Do You Install a Thermostat That Works with the Rheem Classic 90 Plus?
To install a thermostat that works with the Rheem Classic 90 Plus, follow a series of precise steps which include ensuring compatibility, turning off power, removing the old thermostat, connecting the new thermostat, and powering it back on.
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Check compatibility: Ensure the new thermostat is compatible with the Rheem Classic 90 Plus system. Most thermostats will specify compatibility with gas furnaces or specific models.
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Turn off power: Safety is paramount. Switch off the power to your HVAC system at the circuit breaker. This prevents any electrical hazards during installation.
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Remove the old thermostat: Carefully detach the existing thermostat from the wall. Take note of the wiring connections and label them if necessary. It helps to use electrical tape to identify each wire for reinstallation.
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Connect the new thermostat: Follow the instructions provided with your new thermostat. Usually, you will connect wires to terminals labeled according to their function, such as R (power), W (heat), and Y (cool), ensuring each wire is securely attached.
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Power it back on: Once the new thermostat is connected, turn the power back on at the circuit breaker. Check the thermostat settings to ensure it is functioning as intended. Set the desired temperature and confirm that the system responds accordingly.
Following these steps ensures a proper installation of a thermostat compatible with the Rheem Classic 90 Plus.
What Smart Thermostats Are Highly Recommended for Rheem Classic 90 Plus?
The recommended smart thermostats for the Rheem Classic 90 Plus are the Nest Learning Thermostat, Ecobee SmartThermostat with Voice Control, Honeywell Home T9 Smart Thermostat, and Emerson Sensi Touch Smart Thermostat.
- Nest Learning Thermostat
- Ecobee SmartThermostat with Voice Control
- Honeywell Home T9 Smart Thermostat
- Emerson Sensi Touch Smart Thermostat
These options provide various features, including energy savings, remote access, compatibility with various HVAC systems, and ease of use. Some users prefer technology with voice control, while others value straightforward interfaces. Additionally, differing opinions exist on which thermostat offers the best energy efficiency.
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Nest Learning Thermostat:
The Nest Learning Thermostat learns user schedules and preferences, adjusting temperatures automatically. It connects to Wi-Fi, allowing control via smartphone. According to Nest, users can save up to 10-12% on heating bills annually. The thermostat features a sleek design with a clear display and is compatible with most HVAC systems. -
Ecobee SmartThermostat with Voice Control:
The Ecobee SmartThermostat with Voice Control comes with built-in Alexa voice service for hands-free control. It uses occupancy sensors to adjust heating and cooling based on room usage. Ecobee claims users save an average of 23% on their energy bills. Its intuitive app allows remote management of home temperatures easily. -
Honeywell Home T9 Smart Thermostat:
The Honeywell Home T9 Smart Thermostat features a touch screen and works with remote sensors to heat or cool specific rooms. Users can access energy usage reports through the Honeywell Home app. It is known for compatibility with a variety of HVAC systems and can integrate with smart home devices. -
Emerson Sensi Touch Smart Thermostat:
The Emerson Sensi Touch Smart Thermostat offers a user-friendly interface and geofencing capabilities to adjust the temperature based on user location. It provides energy reports that promote savings. The Sensi app allows for easy remote access and is compatible with most systems.
What Insights Do User Reviews Offer About Thermostats for Rheem Classic 90 Plus?
User reviews provide valuable insights into the Rheem Classic 90 Plus thermostat. Key observations include performance, ease of use, durability, energy efficiency, and customer service experiences.
- Performance
- Ease of Use
- Durability
- Energy Efficiency
- Customer Service Experiences
These insights highlight a range of perspectives and opinions regarding the device’s attributes and functionalities.
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Performance: User reviews often acknowledge that the Rheem Classic 90 Plus thermostat delivers accurate temperature regulation. Many users report that it significantly enhances comfort in their homes by maintaining consistent temperatures. Some users, however, mention occasional delays in response times when adjusting the settings.
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Ease of Use: Most reviews indicate that the thermostat interface is user-friendly. Users appreciate the clear display and straightforward programming options. Yet, a few reviews suggest that first-time users may face hurdles in navigating advanced settings, indicating a learning curve for some individuals.
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Durability: Many customers describe the Rheem Classic 90 Plus as reliable and long-lasting. Users report that their units have functioned well for several years without significant issues. Nevertheless, a minority of reviews cite instances of early equipment failures, raising concerns about quality control.
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Energy Efficiency: Users frequently highlight that the thermostat effectively contributes to energy savings. Several reviews mention reduced utility bills as a direct result of using the Rheem Classic 90 Plus. However, there are conflicting views, with some users claiming minimal differences in energy use before and after installation.
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Customer Service Experiences: Customer feedback on service encounters varies. Many users report positive experiences with efficient troubleshooting and support. Conversely, some reviews express dissatisfaction with long wait times or inadequate responses, illustrating inconsistency in customer service performance.
These diverse perspectives reflect the overall user experience of the Rheem Classic 90 Plus thermostat, encompassing both praises and criticisms.
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