If you’re considering upgrading your home’s hot water system, tankless water heaters are worth exploring. These efficient units provide endless hot water while saving space and energy. With numerous options available in 2025, you might wonder which models stand out regarding performance and reliability. Let’s look at the top contenders that promise to meet your hot water needs while keeping your energy bills in check.
Rheem 18kW 240V Tankless Electric Water Heater, Gray
If you’re looking for a reliable and efficient hot water solution for your mid-range home, the Rheem 18kW 240V Tankless Electric Water Heater is a great choice. With a flow rate of up to 4.4 GPM, it guarantees you have continuous hot water on demand. Its compact design saves space, allowing for installation in various locations. The external digital thermostatic control provides precise temperature management, while its impressive 99.8% efficiency translates to substantial energy savings. Regular maintenance is recommended for peak performance, and with an average rating of 4.3 stars, many users find it meets their heating needs effectively.
Best For: Homeowners seeking an efficient, space-saving solution for continuous hot water in mid-range applications.
Pros:
- 99.8% energy efficiency leads to substantial savings on water heating bills.
- Compact design is 90% smaller than traditional tanks, allowing flexible installation options.
- External digital thermostatic control ensures precise temperature management with +/- 1 degree accuracy.
Cons:
- Installation may require professional help and additional costs for electrical and plumbing adjustments.
- Some users report issues with the durability of heating elements, requiring annual replacements.
- Mixed reviews on reliability and longevity, with suggestions to consider alternative brands.
EcoSmart ECO 11 Electric Tankless Water Heater
The EcoSmart ECO 11 Electric Tankless Water Heater is an ideal choice for homeowners seeking energy efficiency and space-saving solutions without sacrificing performance. With its compact design, measuring just 11.5 x 8 x 3.75 inches, you can easily install it in small spaces. Offering an impressive 99.8% thermal efficiency, it heats water only as needed, providing you with endless hot water. Depending on your climate, it supports multiple applications, delivering up to 3.1 gallons per minute. While installation may require some electrical upgrades, customer feedback highlights its ease of setup and significant energy savings, making it a worthy investment.
Best For: Homeowners looking for an energy-efficient, space-saving water heater that delivers endless hot water.
Pros:
- Energy Efficiency: With 99.8% thermal efficiency, it heats water only when needed, reducing energy costs.
- Compact Design: Space-saving dimensions make it easy to install in small areas or as a point-of-use solution.
- Endless Hot Water: Provides consistent hot water supply, accommodating multiple applications based on climate.
Cons:
- Installation Requirements: May require electrical upgrades, including a 60 amp dual pole breaker and 6 gauge wiring.
- Temperature Fluctuations: Some users report temperature variations based on ground water temperature.
- Licensed Electrician Necessary: Warranty is void if not installed by a licensed electrician, which can be a concern for some buyers.
ORBEK 18kW Electric Tankless Water Heater
For homeowners seeking a reliable and space-saving solution, the ORBEK 18kW Electric Tankless Water Heater stands out with its compact design and impressive performance. With a flow rate of up to 4.17 GPM, it delivers endless hot water in just 3 seconds. This energy-efficient unit can reduce electricity costs by up to 60% compared to traditional heaters. Installation requires specific wiring and breakers, but its structural improvements make it easier. Safety features like leakage protection and over-temperature safeguards guarantee peace of mind. Rated 4.5 stars, it’s ideal for smaller homes, though larger spaces may face some limitations.
Best For: Homeowners with smaller spaces looking for an efficient and reliable hot water solution.
Pros:
- High energy efficiency reduces electricity costs by up to 60% compared to traditional heaters.
- Provides endless hot water in just 3 seconds, ideal for multiple points of use.
- Compact design saves over 50% space compared to conventional tank heaters.
Cons:
- Installation requires specific wiring and breaker configurations, which may complicate setup.
- Limited flow rate may not be sufficient for larger homes with high hot water demands.
- Some customers report power limitations affecting performance in bigger spaces.
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Ideal for homeowners seeking efficient hot water solutions, the Rheem RTEX-24 24kW Electric Tankless Water Heater offers an impressive flow rate of up to 5.9 GPM. Its compact design is 93% smaller than traditional units, saving valuable space. With an energy efficiency rating of 99.8%, this unit eliminates standby heat loss, providing on-demand hot water for multiple applications. Easy installation and an adjustable digital temperature display enhance user experience. However, some users have reported inconsistent heating and the need for electrical upgrades. Be sure to check electrical requirements and consult a professional for installation to maximize performance.
Best For: Homeowners looking for an efficient and space-saving hot water solution with on-demand capabilities.
Pros:
- Easy installation with a compact design that saves space.
- High energy efficiency rating of 99.8%, reducing energy costs.
- Provides continuous hot water for multiple applications without standby heat loss.
Cons:
- Some users report inconsistent heating and issues with hot water supply for baths.
- May require electrical system upgrades, which can add to installation costs.
- Mixed customer service experiences regarding support and warranty issues.
WINTEMP Electric Tankless Water Heater (27kW 240V)
Looking for an efficient hot water solution for your home? The WINTEMP Electric Tankless Water Heater (27kW 240V) delivers up to 6.5 gallons per minute, ensuring you’ll never run out of hot water. Its compact design saves space, fitting neatly in tight areas. With a digital temperature display ranging from 86°F to 140°F, you can easily adjust settings using remote WIFI control. Plus, it boasts an impressive 99% energy savings, automatically optimizing energy use based on demand. Safety is a priority with overheat and leakage protections. Enjoy peace of mind with a 2-year warranty, making this heater a reliable choice for your household.
Best For: Homeowners looking for a compact and energy-efficient hot water solution that provides an endless supply of hot water.
Pros:
- Delivers up to 6.5 gallons per minute, ensuring a constant supply of hot water.
- Achieves up to 99% energy savings, optimizing energy consumption based on demand.
- Wall-mounted design saves space and is suitable for tight installation areas.
Cons:
- Requires specific installation requirements, including a 250A household power supply and multiple breakers.
- Initial installation costs may be higher compared to traditional water heaters.
- Limited to 2-4 usage points, which may not be sufficient for larger households.
Electric Tankless Water Heater, 18kW 240V
The Electric Tankless Water Heater, 18kW 240V, is an excellent choice for homeowners seeking a reliable and efficient solution for their hot water needs. With its compact dimensions and lightweight design, it fits seamlessly into your space. This unit saves you 60% on heating costs and offers on-demand hot water with a flow rate of up to 4.3 GPM, perfect for multiple outlets. Safety features like leakage and overheating protection guarantee peace of mind. Installation is straightforward, but you may need electrical upgrades. Rated 4.3 stars, users appreciate its energy efficiency and consistent hot water supply.
Best For: Homeowners seeking an energy-efficient, space-saving solution for consistent hot water supply.
Pros:
- Saves 60% on heating costs compared to traditional tank heaters.
- Provides instant endless hot water with a flow rate of up to 4.3 GPM.
- Multiple safety features ensure reliable operation and peace of mind.
Cons:
- May require electrical upgrades based on existing wiring.
- Some users report temperature fluctuations during use.
- Insufficient hot water supply for larger households with high demand.
Fogatti Electric Tankless Water Heater (18kW 240V)
For homeowners seeking an efficient solution to endless hot water, the Fogatti Electric Tankless Water Heater (18kW 240V) stands out with its impressive flow rate of up to 4.4 gallons per minute. With a high heating efficiency of 98%, you’ll enjoy hot water on demand, adjustable from 86°F to 140°F. Its compact design makes installation in small spaces easy, and the intuitive knob controls with LED display guarantee precise temperature adjustments. While it requires significant electrical capacity, its safety features, including overheating prevention, make it a reliable choice for various applications, whether for home or outdoor use.
Best For: Homeowners looking for an efficient and compact solution for endless hot water in small spaces or as a backup system.
Pros:
- High heating efficiency of up to 98%, providing instant hot water on demand.
- Compact design allows for versatile installation in various locations, including under sinks.
- Intuitive controls with an LED display ensure easy and precise temperature adjustments.
Cons:
- Requires a significant power supply, which may not be suitable for homes with lower amperage service.
- Heating capacity can fluctuate based on the incoming water temperature, especially in colder months.
- Flow rate may be limited when multiple outlets are used simultaneously or when higher temperature increases are desired.
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
Experience endless hot water with the Rheem 240V Heating Chamber RTEX-13, an ideal choice for busy households that demand efficiency. With a powerful 13 kW output and 99.8% energy efficiency, you’ll enjoy a maximum flow rate of 4.8 GPM, ensuring hot water on demand. Its external adjustable digital thermostatic control allows for precise temperature adjustments, while durable copper heating elements promise longevity. Installation is straightforward, requiring only 1/2 NPT adapters. Although some users report a slight delay after pauses, its compact design and consistent performance make it a top recommendation for homes with multiple hot water needs.
Best For: Busy households that require a reliable and energy-efficient solution for continuous hot water supply.
Pros:
- High energy efficiency at 99.8%, leading to significant savings on energy bills.
- Provides a maximum flow rate of 4.8 GPM, offering endless hot water on demand.
- Easy installation with included adapters and user-friendly temperature controls.
Cons:
- Some users experience a slight delay in heating after periods of inactivity.
- Requires a high electrical current, necessitating a double 60 amp breaker for installation.
- Regular maintenance is needed to avoid temperature fluctuations and pressure drops.
Stiebel Eltron Tankless Water Heater – Tempra 29 Plus
Offering an impressive 99% efficiency, the Stiebel Eltron Tempra 29 Plus Tankless Water Heater is perfect for households that need an uninterrupted supply of hot water. With a maximum flow rate of 3 gallons per minute, you can enjoy multiple showers simultaneously without a hitch. Its self-modulating technology maximizes energy use, saving you money on heating costs. The compact design makes installation easy, while the silent operation guarantees it won’t disturb your living space. Just keep in mind that it requires hard-wired electrical service and a whole-house water filtration system for peak performance.
Best For: Households that require a continuous supply of hot water for multiple uses without interruption.
Pros:
- Unlimited Hot Water: Provides a consistent supply for multiple showers and household needs simultaneously.
- Energy Efficiency: Utilizes self-modulating technology to optimize energy use, leading to significant savings on water heating costs.
- Compact and Quiet: Space-saving design with silent operation, making it ideal for installation near living spaces.
Cons:
- Power Dependency: Requires electricity, resulting in no hot water availability during power outages.
- Electrical Infrastructure Needs: Demands substantial electrical setup, including dedicated breakers and potentially a sub-panel.
- Water Quality Sensitivity: Advisable to install a whole-house water filtration system to maintain performance and prevent impurities.
ThermoMate Electric Tankless Water Heater for Single Faucet
The ThermoMate Electric Tankless Water Heater is an ideal solution for those seeking a compact and efficient hot water source, particularly for single faucet applications. With a powerful 4500W output, it delivers instant hot water at a maximum temperature of 131°F. Its self-modulating technology guarantees energy efficiency, heating only when needed. You’ll appreciate the compact design, fitting easily in tight spaces like under sinks. While installation requires hardwiring and specific components, customer feedback highlights quick heating and reduced water waste. This unit is perfect for homes, RVs, or any setting where fast, reliable hot water is essential.
Best For: Those seeking an efficient and compact hot water solution for single faucet applications in homes, RVs, or outdoor settings.
Pros:
- Instant hot water delivery, reducing wait times and water waste.
- High energy efficiency with a self-modulating technology that only heats water when needed.
- Compact design allows for easy installation in tight spaces.
Cons:
- Requires hardwiring and specific installation components, which may pose challenges for some users.
- Occasional reports of inconsistent heating and circuit breaker issues.
- Limited to single faucet use, not suitable for multiple hot water outlets simultaneously.
Factors to Consider When Choosing a Home Tankless Water Heater
When you’re choosing a home tankless water heater, several key factors come into play. You’ll want to think about flow rate, energy efficiency, and installation requirements to guarantee it fits your needs. Additionally, consider the size and temperature control features to optimize performance in your space.
Flow Rate Considerations
How do you guarantee your home has enough hot water for everyone’s needs? One key factor is the flow rate of your tankless water heater, measured in gallons per minute (GPM). Typically, residential units range from 3 to 6 GPM, so you’ll want to assess your peak usage. If your household frequently uses hot water for showers, dishwashing, and laundry at the same time, a higher flow rate is essential to prevent temperature drops. Remember, colder inlet water can reduce the maximum flow rate, especially in winter. Calculate your needs based on the number of fixtures you’ll use simultaneously. With self-modulating technology, many tankless heaters adjust energy output, ensuring efficient and consistent hot water delivery tailored to your household requirements.
Energy Efficiency Ratings
Choosing a tankless water heater that fits your needs involves understanding energy efficiency ratings, which are essential for both performance and cost savings. Look for models with high energy factor (EF) ratings, as these indicate greater efficiency and lower operational costs. Many tankless units can achieve over 99% thermal efficiency by heating water only on demand, considerably reducing energy waste. You could save up to 50% on water heating bills compared to traditional tank models, thanks to self-modulating technology that adjusts energy usage based on water flow. Additionally, the compact design of tankless heaters minimizes heat loss from long piping runs. Regular maintenance, like checking heating elements and descaling, helps maintain energy efficiency, ensuring peak performance.
Installation Requirements
Before installing a tankless water heater, it is crucial to take into account several key installation requirements to guarantee peak performance. Most units demand specific electrical setups, often needing dedicated circuit breakers and appropriate wiring to manage their power needs. You may also need to adjust your plumbing, confirming you have compatible connections, typically 3/4 inch NPT, for proper water flow. Additionally, many tankless models are designed for wall mounting, so you’ll require adequate wall space and structural support for secure installation. Since these heaters often have high electrical current requirements, upgrading your home’s service to a minimum of 200 amps might be necessary. Professional installation is generally recommended to comply with local codes and guarantee peak performance.
Size and Space
When selecting a home tankless water heater, understanding the size and space requirements is vital to guarantee peak performance and fit. These units are typically 90% smaller than traditional tanks, making them ideal for tight spaces, like under sinks or in closets. You’ll want to take into account the flow rate your household needs, ranging from about 3 GPM for single applications to over 5 GPM for multiple uses. Most models measure around 13 to 18 inches in height and width, allowing for convenient wall-mounted installations. It’s important to position the heater near points of use to minimize lag time. Finally, verify your home’s electrical system can handle the heater’s size and wattage to avoid expensive upgrades down the line.
Temperature Control Features
Understanding temperature control features is essential for optimizing your experience with a home tankless water heater. These systems allow for precise adjustments, maintaining a consistent temperature within 1°F of your selected setting, which enhances comfort. Most models include digital displays for easy monitoring and adjustments, letting you set temperatures between 80°F and 140°F based on your needs. With advanced self-modulating technology, your heater adjusts the heating output according to demand and incoming water temperature, ensuring efficiency. Some units even offer multiple temperature presets, making it simple to switch settings for different tasks. Regular maintenance of the temperature control system will help prevent fluctuations, ensuring your heater operates at its best for years to come.
Safety Mechanisms
Choosing a home tankless water heater involves considering various safety mechanisms that protect both you and your property. Many models come equipped with thorough safety features like overheating prevention, leakage detection, and dry-fire protection, minimizing operational risks. Look for devices with ETL or CSA certifications, which guarantee they meet established safety standards. Regular maintenance checks are essential for keeping these safety mechanisms functioning effectively, preventing issues like temperature fluctuations. Some units use self-modulating technology to adjust power consumption based on your hot water needs, enhancing safety and energy efficiency. Additionally, advanced features such as lightning resistance and rigorous factory testing offer peace of mind, guaranteeing reliable performance and user safety right from installation.
Warranty and Support
After ensuring safety mechanisms are in place, it’s time to evaluate the warranty and support that come with your home tankless water heater. Warranty durations can vary greatly, ranging from 1 to 10 years for parts, with some models offering lifetime coverage on specific components like electronics. Be sure to check if the warranty includes labor costs, as many only cover parts, potentially leading to extra expenses. Remember, some manufacturers require professional installation to keep your warranty valid. Additionally, consider the brand’s customer support; responsive service can enhance your experience. Familiarize yourself with the warranty claim process and any troubleshooting guides offered, as this knowledge can help resolve issues more quickly during the warranty period.
Maintenance Needs
When selecting a home tankless water heater, it’s essential to take into account its maintenance needs to guarantee long-term efficiency and reliability. Regular upkeep is critical; you’ll want to check the heating elements annually, as they may need replacement depending on usage and water quality. If you notice temperature fluctuations, periodic cleaning can help prevent mineral buildup and maintain consistent performance. Flushing the system at least once a year is important, especially in hard water areas, to remove scale and sediment. Don’t forget to inspect electrical connections regularly for wear or damage to avoid safety hazards. Always refer to the user manual for specific maintenance guidelines and safety checks to maximize your system’s energy efficiency.