Choosing the right tankless water heater can make a big difference in daily comfort, especially when several people need hot water at once. The 7 Best Rheem Tankless Water Heaters in 2026 featured here cover different household demands, from compact electric units to high-capacity natural-gas systems. Rheem offers both condensing and non-condensing designs, so homeowners can select a model based on efficiency, installation needs, and hot-water demand.
For this review, we focused on flow rate, heating capacity, controls, safety features, installation type, and overall practicality. We also considered whether each model suits a small household, a busy family, or a multi-bathroom home. In addition, these heaters can be a useful alternative to bulky storage tanks when floor space matters.
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7 Best Rheem Tankless Water Heaters in 2026, Hands-On Testing
Before choosing a tankless water heater, it helps to know which models deliver reliable performance, efficient heating, and enough hot water for your household. The best Rheem tankless water heaters focus on practical performance, flow rate, heating capacity, controls, installation requirements, and useful features. We evaluated different Rheem options to help you select a model that matches your home, hot-water demand, and budget.
| Model | Type | Flow Rate | Best For | Price |
| Rheem Prestige RTGH-84DVLN-2 | Condensing Gas | 8.4 GPM | Premium whole-home use | $1,769.30 |
| Rheem RRTG70XLN | Outdoor Gas | 7 GPM | Outdoor installation | $804.00 |
| Rheem Prestige 9.5 GPM | Condensing Gas | 9.5 GPM | High-demand homes | $1,845.92 |
| Rheem RTG 7.0 GPM | Non-Condensing Gas | 7 GPM | Large families | $796.01 |
| Rheem RTGH 8.4 GPM | Condensing Gas | 8.4 GPM | Efficiency-focused homes | $1,049.99 |
| Rheem RTG 9.5 GPM | Non-Condensing Gas | 9.5 GPM | Multi-bathroom homes | $1,243.76 |
| Rheem RTEX-08 | Electric | Up to 1.95 GPM | Multiple fixtures | $239.00 |
1. Rheem Prestige RTGH-84DVLN-2: Premium whole-home Tankless Water Heaters
The Rheem Prestige RTGH-84DVLN-2 is a premium condensing natural-gas option designed for households that want strong whole-home performance without keeping a large storage tank heated around the clock. Its 8.4 GPM flow rate provides substantial capacity for everyday residential demand, while its condensing design focuses on extracting more usable heat from the combustion process.
One of its standout advantages is the built-in water and gas leak detection. If the system detects a problem, it can shut down and provide an error code, adding another layer of protection. The compact wall-mounted construction also makes it appealing when floor space is at a premium. The heater includes energy-saving and water-saving features, while its tankless operation provides hot water as needed. Therefore, it can be a practical choice for families that regularly use multiple fixtures.
Overall, this is a premium pick for homeowners who want efficiency, safety features, and strong whole-home capacity.
Key Specifications
| Specification | Details |
| Brand | Rheem |
| Model | RTGH-84DVLN-2 |
| Flow Rate | 8.4 GPM |
| Fuel | Natural Gas |
| Installation | Indoor |
| Dimensions | 9.8″W x 18.5″H |
| Design | Condensing |
| Special Feature | Leak Detection |
Core Features
- 8.4 GPM flow capacity
- High-efficiency condensing technology
- Natural-gas operation
- Water and gas leak detection
- Automatic shutdown when a detected leak requires protection
- Compact wall-mounted design
- Continuous on-demand hot water
- Water- and energy-saving operation
Pros
- High 8.4 GPM capacity
- Condensing design
- Leak detection
- Space-saving construction
- Suitable for whole-home applications
Cons
- Premium purchase price
- Professional installation may be required
- Natural-gas installation limits placement flexibility
Best For
- Families want a premium indoor gas tankless system with strong capacity and advanced safety features.
Price: $1,769.30
2. Rheem RRTG70XLN 7 GPM: Outdoor installation Tankless Water Heater
The Rheem RRTG70XLN takes a different approach by combining a 7 GPM capacity with an outdoor installation design. That setup can be especially convenient for homeowners who want to avoid placing a combustion appliance inside the living area.
Its flow range starts at approximately 0.26 GPM and reaches up to 7 GPM. The broad operating range allows the heater to respond to different household water demands. Temperature settings range from 80°F to 140°F, with a factory setting of 120°F. Another useful feature is Rheem’s EcoNet smart monitoring technology. It uses sensor information to provide monitoring and protection functions. The unit also uses electronic ignition and combines copper and stainless-steel components for durability.
For homeowners with a suitable outdoor installation location, this model strikes a good balance between capacity and price. It costs considerably less than some of Rheem’s premium Prestige models, so it can be a sensible middle-ground option.
Key Specifications
| Specification | Details |
| Brand | Rheem |
| Model | RRTG70XLN |
| Flow Rate | 0.26–7 GPM |
| Fuel | Natural Gas |
| Installation | Outdoor |
| Dimensions | 13.88″W x 23.63″H |
| Temperature Range | 80°F–140°F |
| Special Feature | Overheat Protection |
Core Features
- Up to 7 GPM flow
- Outdoor installation
- EcoNet smart monitoring
- Electronic ignition
- Overheat protection
- Copper and stainless-steel construction
- Adjustable temperature settings
- Whole-home hot-water capability
Pros
- Outdoor installation saves indoor space
- Good 7 GPM capacity
- EcoNet monitoring
- Durable construction
- Lower price than premium models
Cons
- Requires appropriate outdoor placement
- Natural-gas connection required
- 7 GPM may be limiting for exceptionally high simultaneous demand
Best For
- Families seeking an outdoor natural-gas tankless water heater with smart monitoring.
Price: $804.00
3. Rheem Prestige 9.5 GPM: High-demand homes Natural Gas Tankless Water Heater
When maximum hot-water capacity takes center stage, the Rheem Prestige 9.5 GPM deserves serious attention. Its 9.5 GPM rating places it among the highest-capacity models in this lineup, making it particularly attractive for larger households with several bathrooms.
The condensing design is another major advantage. Instead of simply sending combustion heat through the vent, condensing technology can recover additional heat, supporting improved efficiency. That can help reduce wasted energy during regular operation. This model also includes water and gas leak detection. If a leak is detected, the system can shut down and provide an error code, which gives homeowners an added safety feature. Its compact design also helps reduce the footprint compared with a conventional storage tank.
However, the high capacity comes with a premium price. For a smaller household, paying extra for 9.5 GPM may be unnecessary. For a large family, though, the extra capacity can be worth its weight in gold when several showers and fixtures operate together.
Key Specifications
| Specification | Details |
| Brand | Rheem |
| Flow Rate | 9.5 GPM |
| Fuel | Natural Gas |
| Installation | Indoor |
| Dimensions | 18.5″W x 27.5″H |
| Design | High-efficiency condensing |
| Special Feature | Leak Detection |
Core Features
- 9.5 GPM flow capacity
- Continuous whole-home hot water
- High-efficiency condensing design
- Water and gas leak detection
- Automatic shutdown with detected leaks
- Compact tankless construction
- Indoor installation
- Water-saving operation
Pros
- Excellent flow capacity
- High-efficiency condensing technology
- Leak detection
- Good choice for large homes
- Space-saving design
Cons
- Expensive
- Indoor installation requires proper venting
- May provide more capacity than smaller households need
Best For
- Large families and multi-bathroom homes with substantial simultaneous hot-water demand.
Price: $1,845.92
4. Rheem RTG Series 7.0 GPM: Large families Tankless Water Heater
The Rheem RTG Series 7.0 GPM is a strong choice for homeowners who want substantial natural-gas capacity without stepping into the higher price range of the Prestige line. Its 160,000 BTU/hr output and 7 GPM rating make it suitable for many whole-house applications.
Unlike the condensing models above, this is a non-condensing design. That can simplify certain installation situations, although venting requirements still need careful attention. Its listed 0.82 UEF rating provides respectable efficiency for its category. The integrated digital display is particularly useful because it allows precise temperature adjustment. Hot-start programming can also help reduce temperature fluctuations during repeated use.
Safety is another strong point. The system includes freeze protection, flame-failure protection, and leak detection. As a result, homeowners get a practical combination of performance and protection. For a family with two or three simultaneous showers, this model has plenty of muscle. It is a classic case of getting the job done without paying for features you may not need.
Key Specifications
| Specification | Details |
| Brand | Rheem |
| Flow Rate | 7.0 GPM |
| Output | 160,000 BTU/hr |
| Fuel | Natural Gas |
| Installation | Indoor |
| Dimensions | 13.5″W x 24.2″H |
| UEF | 0.82 |
| Design | Non-condensing |
Core Features
- 7 GPM flow rate
- 160,000 BTU/hr output
- 0.82 UEF
- Digital temperature display
- ±1°F temperature adjustment
- Hot-start programming
- Freeze protection
- Flame-failure protection
- Leak detection
- Wall-mounted design
Pros
- Good balance of price and capacity
- Precise temperature control
- Strong safety features
- Suitable for whole-home use
- Space-saving installation
Cons
- Lower efficiency than the listed condensing model
- Indoor gas installation needs proper venting
- May not suit exceptionally high demand
Best For
- Families wanting a capable 7 GPM indoor gas heater without paying Prestige-level pricing.
Price: $796.01
5. Rheem RTGH Series 8.4 GPM: Efficiency-focused homes Tankless Water Heater
The Rheem RTGH Series 8.4 GPM stands out as one of the most attractive choices for homeowners who prioritize efficiency and strong household capacity. It combines an 8.4 GPM flow rate with a 157,000 BTU/hr output and condensing technology.
Its listed 0.93 UEF rating is a major selling point. Because condensing systems can recover additional heat from combustion gases, they can offer better energy utilization than traditional non-condensing designs. This model is also designed for households with heavy hot-water demand. The supplied specifications position it for as many as three to four simultaneous showers under suitable conditions. However, actual performance depends on incoming water temperature, fixture flow, and required temperature rise.
Temperature control is another highlight. The digital control allows adjustments in 1°F increments, while hot-start programming is intended to help reduce cold-water bursts between uses. With freeze protection, multiple safety systems, and a long listed heat-exchanger warranty, this model checks many boxes. For the money, it may be the sweet spot in the lineup.
Key Specifications
| Specification | Details |
| Brand | Rheem |
| Flow Rate | 8.4 GPM |
| Output | 157,000 BTU/hr |
| Fuel | Natural Gas |
| Installation | Indoor |
| Dimensions | 17.7″W x 23.7″H |
| UEF | 0.93 |
| Design | Condensing |
Core Features
- 8.4 GPM capacity
- 157,000 BTU/hr output
- 0.93 UEF
- Condensing technology
- Ultra-low NOx design
- Digital temperature control
- 1°F adjustment increments
- Hot-start programming
- Freeze protection
- Multi-point safety system
Pros
- Excellent efficiency
- Strong whole-home capacity
- Condensing technology
- Precise controls
- Long listed heat-exchanger warranty
Cons
- Indoor installation requires proper venting
- Professional installation is recommended
- Gas supply requirements must be verified
Best For
- Efficiency-focused families that need high-capacity whole-home hot water.
Price: $1,049.99
6. Rheem RTG Series 9.5 GPM: Multi-bathroom homes Tankless Water Heater
The Rheem RTG Series 9.5 GPM is built for households where hot-water demand can quickly add up. Its 199,900 BTU/hr output and 9.5 GPM maximum flow give it the capacity needed for large families and multi-bathroom homes. This is a non-condensing system, so it differs from the 8.4 GPM RTGH model in efficiency and venting design. However, it still offers a strong 0.82 UEF rating and plenty of heating power.
The unit includes hot-start programming, which is designed to reduce the cold-water burst that can occur when a fixture starts. Its digital control system also allows precise temperature adjustments, helping users maintain a comfortable setting. Safety features include freeze protection, flame-failure protection, and leak detection. Meanwhile, the wall-mounted design keeps the installation footprint relatively compact.
If your home routinely has three or four water points operating simultaneously, this model is worth considering. On the flip side, smaller homes may not benefit enough from its extra capacity to justify the higher purchase price.
Key Specifications
| Specification | Details |
| Brand | Rheem |
| Flow Rate | 9.5 GPM |
| Output | 199,900 BTU/hr |
| Fuel | Natural Gas |
| Installation | Indoor |
| Dimensions | 13.5″W x 24.2″H |
| UEF | 0.82 |
| Design | Non-condensing |
Core Features
- 9.5 GPM maximum flow
- 199,900 BTU/hr output
- 0.82 UEF
- Hot-start programming
- Digital temperature controls
- ±1°F temperature adjustment
- Freeze protection
- Flame-failure protection
- Leak detection
- Wall-mounted construction
Pros
- Highest listed flow capacity
- Powerful 199,900 BTU/hr output
- Good for multi-bathroom homes
- Precise digital controls
- Strong safety package
Cons
- Higher purchase price
- Non-condensing design
- Requires professional gas installation
- More capacity than smaller homes may need
Best For
- Large families with several simultaneous showers or hot-water fixtures.
Price: $1,243.76
7. Rheem 8kW RTEX-08: Best for Multiple fixtures Electric Tankless Water Heater
The Rheem RTEX-08 is the compact electric option in this lineup. With an 8kW heating element and up to 1.95 GPM, it is intended for multiple-fixture applications rather than extremely high-demand whole-house use.
Its biggest advantage is simplicity and size. The unit is significantly smaller than traditional storage heaters, helping homeowners reclaim valuable floor space. Because an electric tankless system heats water only when a tap calls for hot water, it does not need to maintain a large tank of heated water. The digital thermostatic control allows adjustment from 80°F to 140°F in 1-degree increments, giving users fine control over outlet temperature.
However, electrical requirements deserve careful attention. The RTEX-08 calls for 240V single-phase power, a 40-amp double-pole breaker, #8 AWG copper conductors with ground, and a recommended minimum 100-amp household service panel.
This is therefore a good choice when electrical infrastructure and demand align.
Key Specifications
| Specification | Details |
| Brand | Rheem |
| Model | RTEX-08 |
| Power | 8kW |
| Maximum Flow | 1.95 GPM |
| Power Source | AC |
| Voltage | 240V |
| Dimensions | 8.25″W x 12.63″H |
| Temperature Range | 80°F–140°F |
Core Features
- Up to 1.95 GPM
- 8kW heating capacity
- Multiple-fixture application
- 240V single-phase power
- Digital thermostatic control
- 1°F temperature adjustment
- Compact design
- No storage tank
- 5-year leak warranty
- 1-year parts warranty
Pros
- Lowest price in this lineup
- Very compact
- Precise digital controls
- No gas connection required
- Good for suitable multiple-fixture applications
Cons
- Lower flow rate than the gas models
- Significant electrical requirements
- May not satisfy high-demand whole-home use
Best For
- Smaller households or applications with moderate hot-water demand and adequate electrical service.
Price: $239.00
Types of Rheem Water Heater
There are mainly three categories of Rheem water heaters available. A wide range of electric units with different efficiency ratings is available from Rheem.? Since gas units may give higher flow rates and gas prices in the Dunwoody and Marietta areas are typically lower than those for electricity, they typically provide more comfort and energy savings.
Tankless Water Heater
With a Rheem tankless water heater, you can take advantage of the comfort and convenience of continuous hot water on demand.? While the whole-home tankless water heaters available in natural gas, propane, and electric types are fantastic for homes with busy families, homes with luxurious bathrooms, and vacation homes. Rheem offers a wide choice of alternatives, whether you’re wanting to supply hot water to your entire home, a single site, expansions, garages, outbuildings, or even RVs in order to locate the best tankless water heater for your requirements.
Tankless Condensing
Rheem’s natural gas condensing tankless water heaters come in indoor and outdoor models and are packed with features to help you save money and minimize water waste.
RHEEM RTGH-84DVLN-2 Condensing Tankless Water Heater is one of the best natural gas condensing tankless water heaters because it will provide a 12-year warranty and ensure ENERGY STAR certification.
Tankless Mid-Efficiency
With mid-efficiency tankless gas water heaters that provide a constant flow of hot water, Rheem has the solution.? Both indoor and outdoor models, which are energy-efficient and compact, can heat water to the desired temperature whenever and for however long you need it.
For example, you can try Rheem Mid-Efficiency Tankless Water Heater that will deliver a maximum flow rate between 7.0 to 9.5 GPM (gallons per minute).?
Tankless Electric
Rheem electric water heaters are perfect for a single faucet or shower, while the whole-home gas and electric models are appropriate for houses with busy families, homes with luxurious bathrooms, and vacation homes. So, this type will be one of the best water heaters for bathrooms and indoor usage.?? In this regard, you can go for Rheem Tankless Electric Water Heater which is almost 99.8% energy efficient and deliver a maximum flow rate of 8.8 GPM.?
Tank Water Heater
If you’re looking for a gas tank water heater or an electric tank water heater, Rheem has you covered as they produce the world’s best tank water heater.
Tank-Type Gas
For any family’s lifestyle and budget, Rheem tank-type gas water heater offers the ideal blend of performance, functionality, and efficiency, so you can rely on consistent hot water for years to come. For instance, you can take a look at the 40 Gallon Rheem Natural gas water heater.
Tank-Type Electric
Rheem electric tank-type water heater is a perfect illustration of providing the ideal ratio of value, effectiveness, and features for any lifestyle and price range. In this case, the 30 gal. Residential Electric Water Heater will be a better decision.
Hybrid Water Heater
Compared to a conventional 100-Watt incandescent light bulb, Rheem ProTerra Hybrid needs less energy to operate. When you purchase the Rheem Hybrid Electric Water Heater, you can save money through federal tax credits, local utility rebates up to $1,0001, and energy cost savings of up to $491 annually.
Heat Pump Water Heaters
Operating costs are decreased by up to 3.5 UEF. Any leak, big or tiny, internal or external, is discovered by the LeakSenseTM Built-in Leak Detection System. Direct plug-in power cord installed at the factory Replaces a regular gas water heater with ease. You will get all of them from the Professional Prestige Plugin Heat Pump Water Heater.?
Solar Water Heaters
Heat your water by utilizing the sun’s power. Rheem offers a selection of solar water heaters that can efficiently and cheaply heat the water in your house.? Pick from a number of choices to keep your hot water stored and offer backup capacity if necessary. In this context, Rheem SolPak Electric 80 Gallon Water Heater will be a perfect choice.?
Combination Boiler
Look no further than a Rheem Combination Boiler if you want to conserve space in your home while yet enjoying the convenience of continuous hot water.? This type is included Energy Star Certification and 95% AFUE. The ideal replacement for a boiler is included an outdoor reset sensor. For example, you can try Rheem RCBH199DVLN Combi Tankless Water Heater Boiler to get the best experience.?
What Makes a Rheem Tankless Water Heater a Great Choice?
A Rheem tankless water heater is a strong option for homeowners seeking continuous hot water, efficient on-demand heating, compact installation, and precise temperature control. Unlike traditional tanks, it heats water only when needed, helping reduce standby energy use. Properly sized models can support multiple fixtures, making them suitable for busy households. Condensing models can provide higher efficiency, while gas and electric options offer flexibility for different homes.
Rheem is a reputable manufacturer of heating, cooling, and water heaters. The business has been making water heaters since early 1925s.? In actuality, it was among the first businesses to create a water heater. The technology, skill, and knowledge that Rheem dealers offer and that the products deliver can be trusted. If you take a look at Google Trends, you can observe the most popular region for Rheem tankless water heaters.?
Many models also include useful technologies such as digital controls, self-diagnostics, leak detection, Hot Start Programming, and smart monitoring. Their wall-mounted designs save valuable floor space, making them practical for compact utility areas. However, performance depends on water flow, incoming temperature, and simultaneous demand.
Key benefits include:
- Continuous hot water
- On-demand energy efficiency
- Compact wall-mounted design
- Precise temperature adjustment
- Multiple gas and electric options
- Useful safety and smart features
How to Choose the Best Rheem Tankless Water Heaters
Choosing the right unit starts with understanding your home’s hot-water demand, flow rate, fuel type, installation requirements, and efficiency goals.
A higher GPM rating does not automatically mean a better choice; the ideal model should match your peak usage and incoming water temperature.
Consider Your Peak Water Demand
Add the flow rates of showers, faucets, and appliances that may run simultaneously. This helps you calculate the total water demand and determine the appropriate GPM capacity for your tankless water heater, ensuring reliable hot water during peak use.
Check GPM and Temperature Rise
Temperature rise is the difference between incoming cold-water temperature and your desired hot-water temperature. Colder incoming water requires more heating capacity, so consider both GPM and temperature rise before choosing a model.
Choose the Right Fuel Type
Rheem offers gas and electric tankless water heaters. Gas models generally provide higher output for larger households, while electric models can work well where gas service is unavailable and electrical capacity is sufficient.
Select Condensing or Non-Condensing
Condensing models can achieve higher efficiency by recovering heat from exhaust gases, which helps reduce energy waste. In contrast, non-condensing units typically use simpler venting systems, depending on the installation. Your choice should consider efficiency, venting needs, installation costs, and available space.
Check Installation Requirements
Before purchasing, verify whether the model is designed for indoor or outdoor installation. For propane tankless water heaters and EcoSmart tankless water heater options, also check gas-line sizing, venting, electrical service, breaker requirements, and available installation space.
Look for Useful Features
Features such as digital temperature controls, leak detection, Hot Start Programming, freeze protection, and smart monitoring can improve convenience, safety, and performance. These functions may help maintain consistent water temperatures, reduce risks, protect the unit in cold conditions, and make daily operation easier.
Match the Model to Your Household
Smaller homes may not need a high-capacity unit, while households with several simultaneous showers should consider a higher-GPM model. For electric tankless water heaters, electric heaters and space heaters for garage, proper sizing helps prevent inadequate hot-water flow during peak demand.
Consider Long-Term Efficiency
Look at the unit’s efficiency rating along with your expected hot water usage. A highly efficient model may have a higher upfront price, but it can potentially lower energy consumption and operating costs over time. Consider your household’s demand, fuel type, and long-term budget.
Our Top Picks
Here are our top-rated Rheem tankless water heaters, selected for different household needs, budgets and hot-water demands.
| Best Overall | Best for Large Households | Best for Value |
| Rheem Prestige RTGH-84DVLN-2 | Rheem RTG Series 9.5 GPM? | Rheem RTG Series 7.0 GPM? |
| High efficiency, strong capacity, and leak detection | 199,900 BTU/hr output and high-flow performance | Digital controls, strong capacity, and safety features |
| $1,769.30 | $1,243.76 | $796.01 |
Wrap-up
Choosing the right Rheem model comes down to your household’s hot-water demand, flow rate, efficiency needs, and budget. The Rheem Prestige RTGH-84DVLN-2 is our best overall pick, offering high efficiency, strong 8.4 GPM capacity, and useful leak detection. For larger households, the Rheem RTG Series 9.5 GPM provides the high flow and 199,900 BTU/hr output needed for multiple simultaneous hot-water uses. Meanwhile, the Rheem RTG Series 7.0 GPM delivers a practical balance of performance, features and price.
Overall, these picks cover different household needs and budgets, making it easier to select a unit that fits your home. Before purchasing, always check the required gas or electrical service, installation requirements, and expected peak water demand to ensure reliable performance.
FAQs
Is a 7 GPM tankless water heater enough for a family?
It can be. A 7 GPM unit may support multiple fixtures, depending on incoming water temperature, temperature rise, and fixture flow. Families with several simultaneous showers may benefit from a higher-capacity model.
Is Rheem a good brand for tankless water heaters?
Rheem offers a broad selection of gas and electric tankless systems with different capacities, efficiency levels, installation configurations, and safety features. The right model depends on the home’s specific requirements.
Are condensing Rheem tankless water heaters more efficient?
Generally, condensing models can achieve higher efficiency because they recover additional heat from combustion exhaust. However, they can have different venting and installation requirements.
How long do Rheem tankless water heaters last?
Service life varies according to installation quality, water conditions, usage, and maintenance. Regular professional servicing and appropriate scale control can help maintain performance over time.
What size tankless water heater does a family of four need?
There is no universal size based only on family count. Peak simultaneous demand and temperature rise are more useful factors. A family of four with several bathrooms may need substantially more capacity than another four-person household with lower simultaneous demand.
Can Rheem tankless water heaters run multiple showers at once?
Yes, high-capacity models can support multiple showers when properly sized. The actual number depends on flow rate, incoming water temperature, desired outlet temperature, and other fixtures operating simultaneously.
Does a Rheem electric tankless water heater need a special electrical panel?
It may. The RTEX-08, for example, requires 240V single-phase power, a 40-amp double-pole breaker, #8 AWG copper conductors with ground, and a recommended minimum 100-amp household service panel according to the supplied specifications. Always verify the installation requirements for your exact model.
Do Rheem tankless water heaters need maintenance?
Yes. Periodic maintenance can help manage mineral buildup and maintain performance. Gas models may also require inspection of combustion and venting components. Follow the manufacturer’s maintenance recommendations.
Can I install a Rheem tankless water heater myself?
Installation requirements vary, but gas models involve fuel, combustion, venting, and safety considerations, while electric models can require substantial electrical work. Professional installation is recommended, and local codes should always be followed.
What temperature should a Rheem tankless water heater be set to?
A setting around 120°F is commonly used for residential hot water, and several of the listed models use 120°F as a factory setting. Individual needs can vary, so follow the manufacturer’s guidance and use appropriate precautions to prevent scalding.
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