Explore the top tankless water heaters for 2024 in our in-depth reviews. Find the perfect fit for your home and save on energy costs.
The modern household demands efficiency, sustainability, and convenience—requirements that traditional tank-based water heaters sometimes struggle to meet.
This is where tankless water heaters come into play, setting a new standard in domestic water heating technology.
Engineered to deliver hot water on demand, these heaters operate on either gas or electricity, offering immediate comfort and significant energy savings.
Plus, with a longer lifespan than their tank-based counterparts, they offer a long-term solution to your water heating needs.
However, stepping into the realm of tankless water heaters presents many choices. Brands abound, each with its own set of advantages, drawbacks, and technical specifications.
But don’t fret this article aims to simplify your decision-making process. We will explore the leading tankless water heater of 2024 to help you make an educated choice tailored to your home and lifestyle. Check out our “Buying Guide” for information on how we have tested and selected the best tankless water heaters.
Best Tankless Water Heater List
| Best Tankless Water Heater | Fuel Type | Power Output | Warranty | Buy Now |
|---|---|---|---|---|
| EcoSmart ECO 11 Tankless Water Heater | Electric | 18000 Watts | Lifetime warranty | Check On Amazon |
| EcoSmart ECO 18 Tankless Water Heater | Electric | 13000 Watts | Lifetime warranty | Check On Amazon |
| Camplux Tankless Water Heater | Propane | 10 Kilo Watts | 1 Year Warranty | Check On Amazon |
| Stiebel Eltron Tankless Water Heater | Electric | 14400 Watts | 7 years warranty for leakage, 3 year warranty for parts | Check On Amazon |
| Eco Touch Tankless Water Heater | Electric | 5.5 Kilo Watt | 1 Year Warranty | Check On Amazon |
| Rheem Tankless Water Heater | Electric | 18000 Watts | 5 years warranty for heat chamber, 1 year warranty for parts | Check On Amazon |
| Rinnai V65iN Tankless Water Heater | Natural Gas | 150000 BTU/Hr | 10 years warranty for heat exchanger, 1 year warranty for parts | Check On Amazon |
| GASLAND BE158 Tankless Water Heater | Propane | 41000 BTU/Hr | 1 year warranty | Check On Amazon |
| Eccotemp i12-NG Tankless Water Heater | Natural Gas | 75000 BTU/Hr | 2 year warranty | Check On Amazon |
| Airthereal Tankless Water Heater | Electric | 9 Kilowatts | 1 Year Warranty | Check On Amazon |
Best Tankless Water Heater Reviews
1. EcoSmart ECO 11 Tankless Water Heater
The first product on our list is EcoSmart which is a well-known tankless water heater brand. Their ECO11 is a specially designed to meet the needs of smaller spaces like bathrooms, small sinks, and offices.
this unit employs patented Self-Modulating Technology that heats water on-demand, boasting an impressive 99% thermal efficiency. With an amperage draw of 54A, it adapts energy usage to meet specific heating requirements, making it a smart choice for eco-conscious consumers.
It can provide a water flow rate ranging from 1.3 to 3.1 gallons-per-minute depending on the inlet water temperature. This makes it a flexible option for providing hot water exactly where and when you need it.
One of the standout features of the EcoSmart ECO 11 is its compact, wall-mounted design. Measuring just 11.5 x 8 x 3.75 inches, it is 90% smaller than traditional tank water heaters. Another advantage is the unit’s digital temperature control, which allows you to adjust water temperature in increments of one degree. This feature is especially useful in climates where the incoming water temperature is 67°F or higher.
It is ETL listed, AHRI Energy Star compliant, and adheres to NSF/ANSI 372 standards for lead-free water. Before purchasing and installing, make sure to consult the sizing guide to ensure the unit fits both your hot water needs and electrical requirements. Although designed for point-of-use and low-flow applications, it can also serve colder climates but with varying performance.
Customer Feedback: Although the EcoSmart ECO 11 boasts impressive features like energy efficiency and a compact design, some users have found it less than ideal for homes with only a 120V electrical supply.
2. EcoSmart ECO 18 Tankless Water Heater
The second product is another efficient product from the brand EcoSmart brand. This model is specifically designed for small homes and apartments but can also be ideal for larger point-of-use applications.
It is designed with advanced self-modulating technology, this 18-kilowatt heater only consumes energy when you need hot water. This smart feature allows you to save up to 60% on your water heating costs.
Depending on the incoming water temperature, it can deliver a flow rate of between 1.8 and 4.3 gallons per minute, ensuring a consistent supply of hot water whenever you need it. For ease of installation, it is compatible with 2 x 40 AMP double-pole breakers and 2 x 8 AWG wire. An activation flow of just 0.3 GPM makes it highly responsive, giving you hot water almost immediately.
Unlike traditional tank heaters that can take up a considerable amount of space, the ECO 18’s sleek, wall-mounted design is 90% smaller, freeing up valuable floor space in your home. The unit is also backed by a lifetime warranty for residential use, giving you peace of mind.
Moreover, the ECO 18 is ETL Listed by Electric Testing Laboratories and certified for lead-free compliance by the Water Quality Association according to NSF/ANSI 372 standards. User-friendly digital controls allow you to easily set and monitor your preferred water temperature, making the unit incredibly easy to use.
Customer Feedback: While the user appreciated the EcoSmart ECO 18’s energy-efficient and space-saving design, they encountered a significant drawback. It takes a little while to supply hot water at the beginning.
3. Camplux Tankless Water Heater
Camplux Tankless AY132 Water Heater is a versatile and portable solution designed for outdoor applications, perfect for camping trips or off-grid living. Weighing just 10 pounds, this lightweight unit comes with a folding handle for easy transport and quick setup.
With a max power output of 34,000 BTUs/Hr, this water heater delivers hot water at a flow rate of 1.38 GPM. It provides a temperature rise that ranges from 46.4°F to 114.8°F and operates effectively at a minimum water pressure of just 3.0 PSI. This makes it an ideal choice for off-grid locations, as it requires only two size D batteries for operation.
Safety is paramount with this device. It comes CSA Approved and offers a comprehensive 6-in-1 protection system. This includes anti-freezing protection, over-heating protection, high water pressure protection, dry combustion protection, and also a flame failure device to ensure you are secure in various conditions.
The package includes a 1-year guarantee, a 5-foot premium on/off shower head, a 5-foot gas regulator, a set of US-standard garden hoses, and a hardware pack for installation. For safety, avoid using Teflon tape between the gas regulator and the gas inlet pipe and always check for gas leaks before operating the unit.
Customer Feedback: The user found much to admire about tankless water heater, particularly its portability and ease of setup, making it an ideal companion for camping trips and outdoor use. However, they noted a drawback when it came to serving larger groups. With its 5-liter size, the unit fell short of providing an adequate amount of hot water to comfortably accommodate everyone.
4. Stiebel Eltron Tankless Water Heater
The Stiebel Eltron Tempra 15 Plus Tankless Water Heater is a seamless blend of German engineering and technological innovation designed for superior comfort and energy efficiency. With its patented Advanced Flow Control technology, this unit ensures uninterrupted hot water by automatically adjusting the flow if the demand exceeds capacity.
Operating the Tempra 15 Plus is as easy as it gets. A noise-free electronic switch activates the unit, and user-friendly digital controls allow for effortless temperature adjustment. The interior solid copper heating system is both robust and efficient, offering a maximum power output of 14.4kW on a 240V supply.
Its eco-friendly features go beyond just saving space; the unit’s auto-modulation system electronically controls water flow, optimizing energy usage and reducing your monthly bills. An integrated Savings Monitor even lets you track your energy cost savings in real-time.
The unit is designed for single-phase 50/60 Hz, with a maximum temperature rise ranging from 65°F at 1.50 GPM to 33°F at 3.00 GPM. The unit is compatible with 3/4″ NPT water connections and operates under a working pressure of up to 150 PSI.
The unit has been tested and certified by multiple organizations, including ANSI/UL, CSA, ISO 9001, and WQA against NSF/ANSI 372 for lead-free compliance. Additionally, the Tempra 15 Plus comes with generous warranties, offering a 7-year leakage and 3-year parts warranty to give you peace of mind with your purchase. The Tempra 15 Plus boasts a compact and sleek white design that requires no venting, freeing up valuable space in your home while cutting down on installation costs.
Customer Feedback: They were particularly impressed with the unit’s patented Advanced Flow Control technology and other efficient features. However, the user did note a drawback: the initial cost of the unit was a little on the expensive side.
5. Eco Touch Tankless Water Heater
Experience the new standard in home comfort with the EcoTouch Tankless Electric Water Heater. Whether you are looking to upgrade your kitchen, bar, school, hospital, or community center, EcoTouch promises instant hot water with a temperature as high as 116°F, thanks to its powerful 5.5kW heating system.
The EcoTouch employs a unique self-adjusting system that modulates power input based on real-time flow rate and temperature settings. This ensures that you always have water at your desired temperature, even if the flow rate changes.
With a maximum temperature rise of 109°F at 1.2 GPM, the EcoTouch provides a versatile temperature range that can suit various applications, from a quick hand wash to filling up a kitchen sink. User-friendly features are another highlight of this water heater. The digital display and touch control panel make temperature adjustment a breeze. Just turn on the tap, and let the EcoTouch handle the rest.
It is equipped with multiple safety features like over-temperature protection, dry heating protection, and leakage protection. The unit’s water and electricity lines are also separated for added safety. All these safety measures have earned the EcoTouch ETL approval and UL qualification, so you can enjoy peace of mind along with hot water.
Its compact design is as small as an oatmeal box, allowing it to fit almost anywhere. The unit comes with easy-to-use installation brackets, a 10AWG power cord fixed to the unit, and a recommended circuit breaker of 1x 2-Pole 30 AMP, facilitating a hassle-free setup.
Customer Feedback: Although the EcoTouch Tankless Electric Water Heater delivers on its promise of instant and consistent hot water, one customer mentioned that the unit might not be ideal for those with higher hot water demands.
6. Rheem Tankless Water Heater
Rheem 18kW 240V Tankless Electric Water Heater, a powerhouse solution for all your hot water needs. It is an ideal solution for under-sink installations in bathrooms or kitchens, as well as wall-mounted central installations for whole-home use.
With a flow rate of up to 4.4 gallons per minute (GPM), it is suitable for most household needs, including simultaneous use of showers and sinks. Built with durable copper immersion elements, the heater is not only robust but also field-serviceable.
This model comes with an external digital thermostatic control featuring an LED display that provides a remarkable +/- 1-degree accuracy. You will have precise control over the water temperature, ensuring constant comfort in your daily use.
Thanks to its advanced self-modulation system, the heater automatically adjusts its power to meet the hot water demand. You will never have to worry about hot water supply when you need it the most. The unit comes with bottom 3/4-inch NPT water connections that are threaded for easy replacement and simple installation. Plus, the digital temperature display provides an at-a-glance status update, contributing to an overall convenient user experience.
The Rheem 18kW heater operates only when you need hot water, making it an energy-efficient choice that could save you up to 50% on water heating costs according to the Department of Energy (DOE). It is a money-saver and a step forward in sustainability. Compact in size, this point-of-use model can be installed almost anywhere in your home, freeing up valuable storage space.
Customer Feedback: Several users have expressed satisfaction with the features of this product like user-friendly, self-modulating power, and others. However, they did find a drawback. The initial cost of purchasing and installing the Rheem tankless water heater to be a little expensive.
7. Rinnai V65iN Tankless Water Heater
The Rinnai V65iN Tankless Hot Water Heater, a breakthrough in natural gas water heating technology that promises you will never run out of hot water again. It offers unparalleled comfort, durability, and efficiency, making it the ultimate hot water solution for modern homes.
Rated by a Uniform Energy Factor (UEF), the Rinnai V65iN is designed for optimal energy efficiency, saving you from high energy costs. The non-condensing technology and the innovative original design work together to use energy only when necessary.
This compact unit can deliver up to 6.5 gallons per minute (GPM), capable of supplying up to 5 fixtures at once. Whether you live in a large household or have simultaneous hot water needs, this unit will not let you down.
The Rinnai V65iN is compatible with our Rinnai Control module for WiFi control, which is sold separately. This allows you to manage your water heater remotely for even greater convenience.
The compact design makes it an ideal choice for apartments, smaller homes, or as an additional unit for large homes. Featuring built-in scale detection technology, maintenance is minimized, and a comprehensive warranty covers 10 years for the heat exchanger, 5 years for parts, and 1 year for labor.
Customer Feedback: The users of this tankless water heater were quite impressive with its features and compact design. However, the initial cost of the unit and professional installation was a bit steep for her budget.
8. GASLAND BE158 Tankless Water Heater
The GASLAND Outdoors BE158, a highly efficient, 1.58 GPM, 6L portable propane water heater designed to make your outdoor activities more comfortable and convenient. Whether you’re out camping, RVing, hunting, or even just relaxing by the pool, this water heater is your go-to for instant hot water.
With a maximum power output of 41,000 BTU per hour, this compact yet powerful unit offers a temperature rise ranging from 55.4°F (13°C) to 109.4°F (43°C) at a flow rate of 1.58 GPM. Remarkably, it only requires a low water pressure start-up of 3.6 PSI, ensuring you can use it in even the most remote locations.
It runs on a standard 20 lb. liquid propane tank and comes equipped with an electronic ignition powered by two D-cell batteries. The LED digital display provides a bright and easy-to-read temperature readout, helping you to avoid water that is too hot or too cold.
Customer Feedback: Overall, the customers were highly impressed with the unit’s performance, particularly praising its low water pressure start-up. However, they did point out one drawback: they found the instructions in the manual a bit confusing when it came to setting up the electronic ignition.
9. Eccotemp i12-NG Tankless Water Heater
The Eccotemp i12-NG Tankless Water Heater—an energy-efficient solution for whole-home indoor heating. This gas-powered unit is uniquely designed to activate only on demand, eliminating the need for a constant pilot light and thereby reducing overall energy consumption.
It boasts a stylish black tempered glass front panel that will seamlessly blend into any interior setting. But this water heater is not just about good looks; it is smart too. The easy-to-use LED display controls provide an intuitive user interface, allowing you to manage your water temperature precisely.
It comes equipped with fully automatic temperature controls, an energy-saving mode, and child lock technology, ensuring a reliable and risk-free operation. The unit utilizes a safe electronic ignition system and conveniently plugs into a standard 110v electrical outlet using a UL-listed cord.
Installation is hassle-free and quick, thanks to its standard 1/2″ NPT water fittings. The Eccotemp i12-NG is also designed with horizontal venting, allowing for a straightforward installation process that will not eat up your time or space. Additionally, this unit has been field-tested up to an elevation of 5500 feet, although it is not recommended for use at higher elevations.
Customer Feedback: While most of the users have pleased by its sleek design and energy-saving features, some have noted that the horizontal venting options were limited, making it a challenge to fit the system into her designated utility space without some rearrangement.
10. Airthereal Tankless Water Heater
The Airthereal Electric Tankless Water Heater, part of the Evening Tide series, designed to revolutionize your home’s hot water supply. Whether you are the last one in line for the morning shower or have guests over, you will have an uninterrupted supply of hot water at your fingertips.
With Airthereal’s Electric Tankless Water Heater, hot water is just a faucet-turn away. Utilizing advanced self-modulating technology, this 9kW unit heats water on-demand, meaning no more dreaded temperature fluctuations or running out of hot water.
This cutting-edge, wall-mounted unit is a game-changer, occupying 90% less space than a conventional water heater with a tank. Because water is only heated when you need it, the Airthereal Electric Tankless Water Heater can save you up to 50% on water heating costs. That is a win-win for your wallet and the environment.
Our water heater is equipped with high-temperature protection, dry heating protection, and electrical leakage protection. Rest assured, you and your family are safe with Airthereal’s robust safety features. Moreover, the electric and fluid systems are completely isolated to prevent any electrical leakage and water pipe corrosion.
This self-modulating water heating technology is so versatile that it can be used anywhere in the world. This 9kW unit requires a 240-Volt electrical supply and a 40-AMP Circuit Breaker for installation. Make sure your breaker panel meets these specifications before making a purchase.
Customer Feedback: Overall, this product has impressed the customers to a maximum extent. But they did encounter a drawback during the installation process. They found out that his existing electrical panel did not meet the 240-Volt and 40-AMP Circuit Breaker requirements for the unit.
What is a Tankless Water Heater?
The concept of a tankless water heater is as straightforward as it sounds: it is a water heater minus the tank. But what does that mean in practical terms?
In traditional water heating systems, a large tank stores water and heats it continuously, so that it is ready for use when needed. This method, however, can result in significant energy loss due to the standby heating. A tankless water heater disrupts this norm, effectively revolutionizing the way we think about water heating.
In a tankless system, there is no storage of water. Instead, the water is heated instantly as it flows through a heat exchanger. The device kicks into action the moment you turn on the hot water tap, rapidly heating the water to the desired temperature and delivering it straight to you. This on-the-fly heating process virtually eliminates standby energy losses and allows for an endless supply of hot water, offering both efficiency and convenience.
How to Choose the Best Tankless Water Heater?
Investing in a tankless water heater is a significant decision that can impact both your comfort and utility bills for years to come. To help you navigate the options, here is a comprehensive buying guide that breaks down key factors to consider.
1. Different Types of Tankless Water Heaters
When considering a tankless water heater, you will generally encounter two primary options: gas-powered and electric. Each comes with its own set of advantages and drawbacks, which are crucial to weigh before deciding.
- Gas Tankless Water Heaters: Gas-powered models are often touted for their safety features and longevity compared to traditional tank systems. These units are generally more powerful, capable of producing larger volumes of hot water, making them suitable for larger households. However, they are not without their challenges. One such drawback is the tendency for scale buildup within the unit. This issue requires periodic cleaning to maintain optimal performance, which could mean additional maintenance costs over time.
- Electric Tankless Water Heaters: On the flip side, electric tankless water heaters are celebrated for their efficiency. These units are easier to install and require less maintenance than gas models. However, their high electrical demands can be a deal-breaker for some homeowners. For context, while a conventional electric water heater might operate at around 5,000 watts, a tankless version can consume upwards of 25,000 watts. This could significantly impact your electricity bill, so it is essential to factor this into your decision-making process.
Choosing the best tankless water heater involves a thorough evaluation of your household needs, preferences, and constraints.
2. Fuel Types
Tankless water heaters come in a variety of options when it comes to fuel types, including electricity, natural gas, and propane. The choice of fuel can significantly impact the unit’s performance, maintenance, and suitability for your lifestyle.
- Electric Tankless Water Heaters: Electric models are often recommended for less frequent use because they require minimal maintenance. If you do not need hot water daily or only require it for specific tasks, an electric heater can be an excellent choice. These units are also easier to install and can be more efficient, but they do demand a high amount of electricity, impacting your energy bills.
- Natural Gas Tankless Water Heaters: For households that require hot water more regularly, natural gas water heaters are a reliable option. These units are generally more powerful and can produce a higher volume of hot water quickly. They are well-suited for everyday household use but do require regular maintenance, including periodic cleaning to prevent scale buildup.
In summary, your choice of fuel type should align with how often you need hot water, your maintenance preferences, and whether you require a portable option.
3. Water Flow Rate
The water flow rate is a crucial consideration when choosing a tankless water heater, as it determines the unit’s ability to meet your household’s hot water demands. It is usually measured in terms of GPM (gallons per minute).
- For larger families of more than six members or multiple simultaneous hot water uses, a high flow rate between 5-10 GPM is recommended.
- Smaller households of 3-4 members can opt for units with a moderate flow rate of 3-5 GPM.
Tailoring the flow rate to your household size and usage patterns ensures you will have a reliable and efficient supply of hot water.
4. Power Output
Evaluating the power output of a tankless water heater is essential for gauging its performance. For electric models, power output is commonly measured in kilowatts (kW), such as 14kW or 18kW, with higher numbers indicating stronger performance.
In contrast, gas water heaters measure power output in British Thermal Units per hour (BTUs/Hr), revealing the rate at which the unit heats water. Here, too, larger numbers like 150,000 BTUs/Hr signify quicker heating compared to a unit with 41,000 BTUs/Hr.
Lower-powered gas models compensate by delivering water more slowly to reach your desired temperature. Overall, higher power output typically translates to more efficient and faster heating.
5. Venting
Ventilation considerations differ significantly between electric and gas tankless water heaters. For electric models, ventilation is usually not a concern. However, gas units require proper venting to safely expel combustion byproducts like harmful gases and steam.
Some gas tankless water heaters come with an included venting kit, but this is not universal. Before making your purchase, verify whether a venting kit is included or if you will need to acquire one separately from aftermarket suppliers. Ensuring proper ventilation is crucial for the safe operation of gas-powered units.
6. Maintenance
Gas-powered tankless water heaters often require more regular maintenance to manage scale buildup, which can affect performance and longevity. Regular descaling and inspections are advised to keep the unit in optimal condition.
7. Additional Features to Consider
- Digital Displays: These allow for easier customization of settings and provide real-time monitoring of the unit’s performance. This feature can be particularly useful for tweaking efficiency and troubleshooting issues.
- Remote Control: Some high-end models come with smartphone app compatibility, allowing you to control settings and monitor performance remotely. This adds a layer of convenience, especially for tech-savvy users.
- Self-Modulating Technology: This feature dynamically adjusts the energy used based on the volume of water required. By tailoring energy usage to demand, self-modulating technology enhances the unit’s overall efficiency, which could lead to cost savings in the long run.
8. Cost
The initial purchase price of a tankless water heater is just one part of the total expense. Professional installation can add to the cost, especially if upgrades to electrical or gas lines are necessary. It’s essential to factor these into your budget.
9. Safety Features
When choosing a tankless water heater, safety features should be a top priority. For gas models, look for flame failure protection, which automatically cuts off the gas supply if the flame extinguishes, reducing fire risks.
Electric models should have electrical surge protection to shield internal circuits from voltage spikes, prolonging unit lifespan and ensuring safer operation. These safety mechanisms are not just about preventing accidents; they also contribute to the overall longevity and reliability of your water heater.
Best Tankless Water Heater – FAQs
Ans: While some DIY enthusiasts might take on the installation, it is usually recommended to have a professional handle it, especially for gas models that require venting and possible line upgrades.
Ans:The average lifespan of a tankless water heater is around 20 years, significantly longer than most traditional tank models, which last about 10-15 years.
Ans: Many tankless water heaters are designed with energy efficiency in mind and can be more eco-friendly than traditional tank models, especially those with high Energy Factor (EF) ratings.
Ans: Yes, but make sure to choose a model designed for cold climates. These models are better insulated and have freeze protection features to withstand low temperatures.
Ans: Gas-powered tankless water heaters may still function during an electrical outage, but electric models will not. Even gas models may require electricity for digital displays and other features.
Ans: Some local and federal programs offer tax credits for installing energy-efficient appliances like tankless water heaters. Check with local authorities for current offers.
Ans: Yes, but hard water can lead to quicker scale buildup, requiring more frequent maintenance. Water softeners or descaling agents can help mitigate this.
Ans: Many modern units come with diagnostic features that help identify issues. However, for safety and performance reasons, repairs should be carried out by qualified professionals.
Ans: The time it takes for hot water to reach the tap can vary based on the distance from the unit. Some models offer recirculation pumps to speed this up.
Ans: Installation location depends on several factors like ventilation needs, gas or electrical connections, and local building codes. Always consult with a professional for the safest and most effective installation.
Conclusion
The shift from traditional tank-based water heaters to tankless models is a game-changer for homeowners seeking energy-efficient, space-saving solutions for their hot water needs.
We trust that you have taken the time to read through our comprehensive reviews of various tankless water heaters, as well as our detailed buying guide. Armed with this information, selecting the ideal water heater for your specific needs should be easy.
But if you are still grappling with indecision, here are our top recommendations.
- For electric, go with EcoSmart ECO 18 Tankless Water Heater. It is energy-efficient, powerful, and comes with a lifetime warranty.
- For larger households needing high water flow, consider the Rinnai V65iN Tankless Water Heater. It is natural gas-powered, eco-friendly, and offers a 10-year warranty.
- For portability and budget-conscious options, choose GASLAND BE158 Tankless Water Heater. It is easy to install and comes with a 1-year warranty.
These picks should help simplify your decision-making process. For any other queries, write to us in the comment section below.
