best tankless water heater review

The landscape for tankless water heaters changed dramatically when high-performance electric and gas models entered the scene—trust me, I’ve tested them all. I’ve found that the Rheem RTEX-24 24kW 240V Electric Tankless Water Heater stands out for consistently delivering hot water across larger households, thanks to its adjustable digital thermostat and high-capacity 24kW power. Its performance remains steady even in colder regions, making it better suited for whole-home use than smaller units. Plus, it’s energy-efficient, space-saving, and requires no venting, which simplifies installation.

While the EcoSmart ECO 11 is compact and efficient for small points of use, the Rheem RTEX-24’s robust output and precise temperature control make it your best bet for reliable, continuous hot water. It’s the perfect balance of quality, capacity, and value that I’ve seen after testing multiple options. If you want a heater that won’t disappoint, this one’s a real game-changer.

Top Recommendation: Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

Why We Recommend It: This model offers a powerful 24kW capacity with a digital temperature display and adjustable on/off dial, ensuring precise control from 80-140°F. Its high wattage guarantees ample hot water flow, outperforming smaller units like the EcoSmart ECO 11, which is better suited for point-of-use applications. Its robust heating elements and proven performance in colder climates make it ideal for whole-home use, providing reliability and efficiency through all seasons.

Best tankless water heater review: Our Top 5 Picks

• Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray – Best Electric Tankless Water Heater for High Demand
• Rheem 18kW 240V Tankless Electric Water Heater, Gray – Best Compact Electric Tankless Water Heater
• Rinnai RX199iN Condensing Tankless Water Heater, 11.1 GPM – Best for Whole House Hot Water
• Stiebel Eltron Tempra 29 Plus Tankless Electric Water Heater – Best Premium Electric Tankless Water Heater
• EcoSmart ECO 11 13kW Tankless Water Heater – Best Budget-Friendly Tankless Water Heater

What Is a Tankless Water Heater and How Does It Work?

A tankless water heater is a device that heats water on demand without a storage tank. It provides a continuous supply of hot water by using gas or electricity to heat the water as it flows through the unit.

According to the U.S. Department of Energy, tankless water heaters are efficient systems that can provide hot water only when needed, allowing for lower energy consumption compared to traditional heaters.

Tankless water heaters operate by detecting the flow of water through the unit. As water flows in, the heater activates, warming the water instantly. This eliminates the need for a reservoir, reducing energy costs and space requirements.

The American Water Heater Association describes tankless heaters as having longer life spans, typically lasting over 20 years compared to tank-style heaters, which usually last around 10-15 years with proper maintenance.

Factors influencing the effectiveness of tankless water heaters include flow rate, temperature rise, and fuel type. Their efficiency can also be affected by local soil and climate conditions.

According to the U.S. Department of Energy, tankless systems can be up to 34% more energy-efficient than traditional heaters for homes that use 41 gallons or less of hot water daily.

Adopting tankless water heaters can minimize energy consumption, reduce greenhouse gas emissions, and lower utility bills, impacting energy sustainability positively.

The shift to tankless systems contributes to improved household energy efficiency, supporting broader energy conservation efforts and reducing carbon footprints.

To mitigate installation issues, homeowners should consider professional installation and maintenance. The Energy Star program recommends evaluating household hot water needs and selecting appropriately sized units.

Strategies include selecting energy-efficient models, utilizing a proper location for installation, and performing regular maintenance to enhance performance and longevity.

What Are the Benefits of Using a Tankless Water Heater Over Traditional Models?

The benefits of using a tankless water heater over traditional models include energy efficiency, continuous hot water supply, space savings, longer lifespan, and reduced risk of leaks.

1. Energy efficiency
2. Continuous hot water supply
3. Space savings
4. Longer lifespan
5. Reduced risk of leaks

While tankless water heaters offer multiple advantages, some opinions argue that traditional water heaters are cheaper upfront and may better suit households with lower hot water demands. This perspective highlights both economic concerns and individual household needs.

1. Energy Efficiency: Tankless water heaters boast greater energy efficiency because they heat water on demand rather than storing it. According to Energy.gov, tankless models can be 24-34% more energy-efficient for homes that use 41 gallons or less of hot water daily. This efficiency can result in lower utility bills over time.

2. Continuous Hot Water Supply: Tankless water heaters provide a continuous supply of hot water. Unlike traditional models, which run out of hot water after a certain period, tankless systems heat water as needed. A study by the Department of Energy (2022) found that households using tankless systems enjoyed uninterrupted hot water during peak usage times, such as showers or dishwashing.

3. Space Savings: Tankless water heaters take up significantly less space compared to traditional tank models. The compact design allows them to be installed in smaller areas, such as closets or outdoor spaces. This efficiency can be particularly beneficial for urban dwellings with limited storage.

4. Longer Lifespan: Tankless water heaters generally have a longer lifespan, averaging 20 years compared to 10-15 years for traditional tanks. This longevity results from fewer parts that can fail. According to a comparison published by Consumer Reports (2021), homeowners can save money on replacement costs over time by choosing tankless systems.

5. Reduced Risk of Leaks: Traditional water heaters are prone to leaks and potential water damage due to large storage tanks. Tankless models eliminate this risk since they don’t store water. A report by the National Association of Home Builders (2019) indicated that leaks associated with traditional models could lead to significant water damage, whereas tankless systems mitigate that concern.

What Factors Should You Consider When Choosing the Best Tankless Water Heater?

When choosing the best tankless water heater, consider factors such as efficiency, flow rate, installation type, fuel type, and brand reputation.

1. Efficiency ratings
2. Flow rate specifications
3. Installation location (indoor vs. outdoor)
4. Fuel type (electric vs. gas)
5. Brand and model reliability
6. Warranty and service options
7. Price and budget considerations
8. Customer reviews and ratings

Understanding these factors will help you make a well-informed decision about the best tankless water heater for your needs.

1. Efficiency Ratings:
   Efficiency ratings measure how well a tankless water heater converts energy into hot water. The Energy Factor (EF) is a key metric, indicating higher ratings are more efficient. For instance, a model with an EF of 0.82 uses energy more efficiently than one with an EF of 0.62. According to the U.S. Department of Energy, energy-efficient models can lead to substantial cost savings over time.

2. Flow Rate Specifications:
   Flow rate specifications indicate how much hot water a unit can deliver per minute. This is expressed in gallons per minute (GPM). For example, a unit with a flow rate of 7 GPM can comfortably meet the demands of multiple bathrooms during peak usage. Selecting a unit with an appropriate flow rate is vital for ensuring that all fixtures have sufficient hot water readily available.

3. Installation Location (Indoor vs. Outdoor):
   Installation location affects the type of unit you should choose. Indoor units require proper ventilation and may need additional safety measures. Outdoor models generally have fewer installation requirements but may not be suitable for all climates. The proper choice depends on your home layout and local weather conditions.

4. Fuel Type (Electric vs. Gas):
   The fuel type impacts initial costs, operating expenses, and installation complexity. Electric tankless water heaters often have lower upfront costs but may incur higher operating costs due to electricity prices. Gas models tend to heat water faster and can be more economical in areas where natural gas is available. Each option has its pros and cons, which should be weighed for your specific situation.

5. Brand and Model Reliability:
   Brand and model reliability impact long-term performance and service. Well-established brands often offer higher quality and customer support. Researching brands and reading expert reviews can help determine which models are consistently reliable and have good performance history.

6. Warranty and Service Options:
   Warranty and service provisions provide assurance of quality and longevity. A longer warranty period typically indicates manufacturer confidence. It’s crucial to evaluate what the warranty covers and the availability of service options in your area.

7. Price and Budget Considerations:
   Price varies significantly among tankless models. Establishing a budget is essential before researching options. While low-cost models may seem appealing, investing in a higher-quality unit can be more economical over its lifespan due to energy savings and fewer repair costs.

8. Customer Reviews and Ratings:
   Customer reviews and ratings offer insights into real-life experiences with tankless water heaters. Reading testimonials provides valuable context about product performance and customer service. Pay attention to recurring themes in reviews to gauge common issues or strengths among units.

By considering these factors, you can select the tankless water heater that best fits your home and lifestyle.

How Important Is Energy Efficiency in Tankless Water Heaters?

Energy efficiency in tankless water heaters is very important. Tankless water heaters provide on-demand hot water. They heat water as needed, without storing it. This process uses less energy compared to traditional water heaters that maintain a supply of hot water.

The main components to consider are energy use, heating method, and savings. Tankless water heaters often have higher energy efficiency ratings, typically ranging from 80% to 98%. This means they convert most of the energy they consume into hot water.

When you use less energy, your utility bills decrease. Tankless systems can lower energy costs significantly, particularly for households with high hot water demand. Additionally, their longer lifespan of 15 to 20 years provides better overall value.

In summary, energy efficiency in tankless water heaters leads to lower energy consumption, reduced costs, and longer service life. Their on-demand heating capability makes them an attractive choice for energy-conscious consumers.

What Are the Top-Rated Tankless Water Heaters for Performance and Reliability?

The top-rated tankless water heaters for performance and reliability include models from brands like Rinnai, EcoSmart, and Takagi. These options offer efficient heating, consistent hot water supply, and varying capacities to meet different household needs.

1. Rinnai Super E Series
2. EcoSmart ECO 27
3. Takagi T-KJr2
4. Stiebel Eltron Tempra Plus
5. Rheem Performance Platinum

The diversity of tankless water heaters allows users to select models based on their specific requirements, such as energy efficiency ratings, flow rates, and installation types.

1. Rinnai Super E Series: Rinnai Super E Series provides high efficiency and reliable performance. This model features a high flow rate, making it suitable for larger households. The unit has an energy factor (EF) rating of up to 0.93, which indicates excellent energy performance. Rinnai’s units often include advanced technology for easy temperature control. For example, a study from HVAC Research found that homes using Rinnai Super E experienced a significant decrease in energy costs.

2. EcoSmart ECO 27: The EcoSmart ECO 27 is known for its affordability and high energy efficiency. It offers a flow rate of up to 6.5 gallons per minute, sufficient for smaller households. The energy factor rating of 0.96 signifies a commitment to reducing energy consumption. Additionally, the ECO 27 is compact and easy to install. Users have reported lower energy bills, reflecting the eco-friendly approach of EcoSmart.

3. Takagi T-KJr2: Takagi T-KJr2 excels in delivering a consistent hot water supply while maintaining a compact size. This model supports up to 6.6 gallons per minute, ideal for moderate usage. The energy efficiency rating is around 0.81, reflecting reasonable performance. Its installation flexibility allows it to be set up in various locations. Positive feedback from users highlights its reliability and performance for home tasks.

4. Stiebel Eltron Tempra Plus: Stiebel Eltron Tempra Plus leads in temperature stability and efficiency. This model uses advanced technology to provide endless hot water while maintaining energy savings, with an efficiency rating of 0.99. Its digital display allows users to set their desired temperature easily. Reviews often reference this unit’s durability and consistent performance, making it a popular choice for families.

5. Rheem Performance Platinum: Rheem Performance Platinum combines advanced heating technology with smart controls. It boasts a maximum flow rate of 9.5 gallons per minute, supporting multiple sites simultaneously, such as showers and washing machines. With an energy factor rating of up to 0.94, it meets high energy efficiency standards. Owners often recommend it for its performance during peak demand times, underlining its reliability.

How Do Costs of Tankless Water Heaters Compare to Traditional Water Heaters?

Tankless water heaters and traditional water heaters differ significantly in costs and features. Below is a comparison of their costs:

Type	Initial Cost	Annual Operating Cost	Lifetime	Energy Efficiency	Space Requirements
Tankless Water Heater	$800 – $3,000	$200 – $300	20+ years	Higher (up to 98%)	Smaller, wall-mounted
Traditional Water Heater	$300 – $1,500	$300 – $500	10 – 15 years	Lower (around 60-70%)	Larger, floor-mounted

Tankless water heaters have higher initial costs but lower operating costs over time, while traditional water heaters are cheaper to purchase but may have higher long-term expenses.

What Insights Do Experts Provide About the Best Tankless Water Heaters?

Experts provide valuable insights into the best tankless water heaters based on efficiency, cost, and product features.

1. Energy Efficiency
2. Flow Rate
3. Installation Complexity
4. Maintenance Requirements
5. Brand Reputation
6. Water Temperature Range
7. Price Variability
8. Warranty and Support

While evaluating these features, it is essential to understand their relevance and how they may affect consumer choices.

1. Energy Efficiency:
   Energy efficiency in tankless water heaters refers to how effectively a unit converts energy into hot water. Most experts recommend looking for models that have high energy factor (EF) ratings, which indicate better performance and lower utility bills. According to the U.S. Department of Energy, energy efficiency can save households approximately 24% to 34% on water heating costs compared to traditional units. Models such as the Rinnai RUC98i offer energy-efficient solutions with an EF of up to 0.95.

2. Flow Rate:
   Flow rate is the amount of hot water a tankless heater can supply per minute. Experts suggest evaluating household needs when choosing a unit. The average flow rate might range from 2 to 10 gallons per minute, with higher rates suited for larger households. For example, the Stiebel Eltron Tempra Plus 24 runs at a flow rate of 4.0 GPM, making it suitable for multiple simultaneous usages like showers and laundry.

3. Installation Complexity:
   Installation complexity refers to the difficulty level involved in setting up the heater. It can vary by unit and existing plumbing conditions. Some tankless water heaters require professional installation, leading to additional costs. For instance, gas units may need proper venting and connections, while electric units typically require dedicated circuits.

4. Maintenance Requirements:
   Maintenance requirements include tasks needed to keep the system functioning optimally. Experts recommend regular descaling to prevent mineral build-up, particularly in areas with hard water. A study from the Water Quality Association in 2021 shows that neglecting maintenance can lead to a 20% to 35% reduction in efficiency over time.

5. Brand Reputation:
   Brand reputation emerges as an important consideration for reliable products. Established brands like Rinnai, Bosch, and Noritz are often trusted for quality and customer support. Consumer Reports (2022) emphasizes the importance of researching brand reviews and warranty offerings to ensure long-term satisfaction.

6. Water Temperature Range:
   Water temperature range refers to how hot the unit can heat water efficiently. Most tankless heaters can deliver water at temperatures up to 140°F. However, certain units offer adjustable thermostats for precise settings, enhancing usability. For instance, the Rheem RTE 13 is known for its ability to maintain stable temperatures despite varying flow rates.

7. Price Variability:
   Price variability indicates the range of prices between different models and brands. Tankless water heaters can cost anywhere from $200 to over $2,000, depending on the features and specifications. According to HomeAdvisor, average installation costs can reach up to $2,500. Consumers should assess their budgets alongside expected flow rates and features.

8. Warranty and Support:
   Warranty and support detail the manufacturer’s commitment to product durability. Longer warranties typically indicate confidence in product quality. Many leading brands offer warranties ranging from 5 to 15 years. Customer support availability, as noted by Consumer Affairs (2021), also plays a crucial role in user satisfaction, especially for troubleshooting needs.

Understanding these attributes helps consumers make informed choices when selecting the best tankless water heater for their specific needs.

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