Top 10 Best Tankless Water Heaters (Reviews & Buyers’ Guide 2022)

The EcoSmart ECO 18 Electric Tankless Water Heater is ranked number 1 for good reason: cost-efficiency. Acquiring an average rating of 4.5-stars on Amazon, the product has been revered as the best electric water heater by numerous customers.

An electric tankless water heater hailing from one of the best-selling manufacturers, the EcoSmart ECO 18 has an Amazon’s Choice award under its belt and has been continually racking up positive reviews.

The EcoSmart ECO 18 has an energy output of 18kW, enough to support small houses, apartments, and larger point-of-use applications. It can diffuse up to a maximum of 4.3 gallons of hot water per minute, depending on the water inlet temperature.

Its patented Self-Modulating Technology grants up to 60% water heating cost reduction—user reports say that the product drastically reduced the costs leading to powerful word-of-mouth marketing (several positive reviews are attributed to friend referrals). The technologically-advanced process allows water heaters to automatically regulate the amount of energy needed to produce a continuous stream of steaming hot water.

Positive user reviews also pointed out its compact design; the Ecosmart tankless water heater allows users to save 12 cubic feet of space since it’s 90% smaller compared to traditional water heaters. The ECO 18 can also be wall-mounted to further save floor space.

The Ecosmart tankless water heater comes with a lifetime warranty for residential use.

The Bosch Electric Mini-Tank Water Heater Tronic 3000 T belongs to an exclusive group of top-tier products (Amazon’s Choice) and is easily one of the best electric water heaters on the market. This battery-powered electric water heater scored a 98% thermal efficiency, granting users decreased energy consumption whenever it starts to heat water. Reduced energy consumption ultimately leads to reduced water costs—a perfect display of German engineering.

The mini-tank water heater can hold four gallons of water at a time, but can continuously dispense hot water as needed. Reviews say that four gallons are enough to fill two kitchen sinks for a day’s use (including sanitary and waste handling). The product is guaranteed to last long, thanks to its premium glass-lined components and thick CFC-free foam insulation.

As one of the top tankless water heaters, it is equipped with a pressure relief valve for enhanced security. It protects the unit by draining water should it present spiking amounts of pressure during operation. For convenience, have the water heater mounted somewhere safe and familiar to easily configure flowrates according to preference.

The product comes with a six-year warranty and a separate two-year warranty on parts.

Another product from EcoSmart joins the prestigious list: the EcoSmart ECO 11 Electric Tankless Water Heater. The watered-down version of the 18-kW variant is still capable of bringing continuous hot water to numerous households. Just like its successor, the ECO 11 also bears the Amazon’s Choice label.

The Ecosmart tankless water heater houses a built-in LED display to continuously monitor water flow rate and temperature. The Digital Temperature Control panel is available for tweaking the current configuration or setting the required temperature in small increments. Since it uses lower power during operation, expect to have reduced costs every month. Not all households need the bigger 18-kW water heater; the 13-kW should already suffice if you do not have large hot water consumption.

The ECO 11 utilizes an energy-efficient process called Self-Modulating Technology; the patented feature controls energy consumption during operation. It enables the electric tankless water heater to only heat the required amount of water and becomes idle once delivered.

Having the ECO 11 can service a household of four, while also taking up 90% less space than traditional water heaters. Pretty neat.

Another product suitable for consumers is the Rinnai V75iP Tankless Hot Water Heater. The gas-powered instant water heater sits comfortably at number four, with a 4.5-star rating to its name on Amazon.

The Rinnai tankless water heater has one of the highest flow rates on the list, capable of dispensing hot water at 7.5 GPM (gallons per minute). Water temperature can be properly monitored and controlled via its front panel; just manually press the buttons to adjust incoming streams.

For additional security measures, the V75iP has a proprietary Temperature Lock installed to avoid any unauthorized changes to the water temperature. That way, heating coils can sit with the current temperature and not cause any abrupt changes.

The Rinnai tankless water heater is equipped with a leak detection system. Whenever the system detects a possible leak, it automatically shuts itself down to prevent further internal damage. Also, the product comes with an enhanced scale detection to reduce the possibility of serious damage in the future. This feature manages internal heating coils and prevents them from forming limescale during continuous operation.

For uninterrupted streams of hot water, avail of the Stiebel Eltron Tempra 15 Tankless Water Heater. As one of the best instant water heaters on the market, the Tempra 15 boasts a 4.6-star rating on Amazon. User reviews are overwhelmingly positive, with one customer installing over 50 of them in different houses and not once encountering an issue.

The corded electric water heater offers output water temperatures ranging from 68° to 140°F, and its small yet sleek design helps save storage space in the house. During operation, the Tempra 15 uses 15% less energy compared to conventional electric water heaters. Less energy directly correlates with less power consumption, which in turn lessens water costs.

One thing to notice about the product is its simplicity. You can avail of the continuous streams of hot water at a press of an electronic switch. The Stiebel Eltron tankless water heater also works silently; it will not emit loud noises at any point during operation. If you wish to change the temperature, just tweak the configurations present on the digital temperature display. Easy-peasy.

Although the Stiebel Eltron tankless water heater is of superb quality, the manufacturer still offers seven-year and three-year warranties on leakage and parts, respectively. Both warranties are included when purchasing the electric water heater.

Getting the sixth spot is the Rheem RTEX-18 Electric Tankless Water Heater—the highly-rated product on Amazon enjoys a 4.5-star rating alongside positive reviews from users around the globe.

The gray Rheem tankless water heater has an advanced Self-Modulating System capable of holding bursts of hot water from dispensing and regulating it according to the user’s preference. The water heater also is easy to install and requires bottom ¾-inch NPT water connections for stable flow rates.

The RTEX-18 has durable copper immersion on each of its heating elements and is also capable of producing hot water at a rate of 4.4 gallons per minute. The front panel has an external digital thermostatic display for temperature; it allows the user to monitor the temperature inside the water heater. For adjustments, a knob just located within the front panel can be rotated to suit everyone’s preference.

The electric Rheem tankless water heater can be best viewed when positioned upright, making it better when wall-mounted.

The wall-mounted Camplux 3.18 GPM Gas Tankless Water Heater is a liquid propane-powered water heater best suited for customers leading an outdoor lifestyle. Its sleek, black tempered casing isolates the white front panel, making it easy to spot. The front panel serves as its command center—the temperature regulation control and digital indicators are on display here.

The temperature controls are backed with an anti-tampering mechanism called “Child Locking” technology. This is employed to avoid unnecessary and accidental control tampering from children (or any unauthorized person).

The Camplux tankless water heater produces hot water with temperatures ranging from 95°-149°F, and at flow rates reaching up to 3.18 gallons per minute. Buying the product also comes with a 2.36-inch steel vent pipe for efficient power ventilation. Installing the product can be easy, however, it is generally recommended to seek assistance from a professional.

During operation, the Camplux tankless water heater typically generates about 42 Watts and 0.35 Amperes making it an energy-efficient appliance. Tapping in low-power appliances is extremely useful especially when facing economic disadvantages.

The energy-efficient water heater makes use of its safe electronic ignition system to fully propel heating operation using solid-state controls. The anti-freezing protection feature prevents moisture from building up internally by automatically opening up the valves during a power outage. These cool features come with a hefty price tag, though.

The RINKMO Electric Tankless Water Heater comes from a lineage of instant and highly efficient water heaters thus obtaining a 4.1-star rating on Amazon can be quite a mark. The tankless water heater borrows the design from previous generations and improves upon it, especially on the specifications.

The product isn’t limited to the amount of water it can hold inside (unlike the traditional water heaters); the heater automatically initiates the ignition phase giving the consumer an unlimited supply of hot water while in operation. The heater exchange only functions when hot water is needed, otherwise, it sticks to the current configuration set by the temperature sensor.

A rotating knob, just below the real-time indicator, can be used to adjust the water temperature. Please note that the temperature can be switched from Celsius to Fahrenheit, and vice versa.

The tankless water heater also utilizes Smart Modulating Technology to seamlessly adjust the power consumption based on the flow rate. With this, no excess energy is wasted since the system controls the needed output. The more energy-efficient the product is, the more it is cost-effective in the long run.

Even on idle operations, the front panel stays lit to indicate the current temperature. It will be only turned off once the water heater gets unplugged or external valves are removed.

The product is perfect for indoor installations since it is designed to latch on walls. It also doesn’t need to occupy that much space since the form factor is small.

Another Camplux product made the Top 10 Best Tankless Water Heaters of 2022. As the second product to join the exclusive club, Camplux 2.64 GPM Tankless Gas Water Heater is no stranger to rave reviews (4.1-star rating on Amazon) from customers. Many have benefited from this product, thus it is only appropriate to have it on the list.

Before enjoying the product, make sure to have a gas regulator, a ⅝’’ NPT male to 1/2 ‘’ BSP female gas connector adapter to successfully integrate it with a propane tank. Call a professional for consultation—a wrong connection could make things worse.

The propane water has an electronic ignition system installed; just seconds after adjusting the temperature, the previously lukewarm water can instantly become hot. If you decide to withdraw, turn the knob back to a stable room temperature. You can verify the current temperature by viewing the Digital Temperature display.

The product offers an endless hot water supply with a 2.4 gallon-per-minute flow rate. This is made possible by applying inventive combustion technology to continuously provide streams of hot water. With virtually no wait time, anyone could enjoy hours of free-flowing hot water.

The water heater also comes with Overheat Protection feature; it protects the device from gaining a large influx of heat quickly. The Dry Combustion Protection feature prevents the internal buildup of heat during dry temperatures.

The only drawback is that this heater can’t be used for drinking water, and is strictly limited to bathroom and kitchen uses.

Perfect for commercial and residential households, the Eemax EEM24018 Electric Tankless Water Heater is a highly recommended product with tons of features. As one of the best electric water heaters on the market, it bagged an Amazon’s Choice label and is currently enjoying a 4.4-star rating from customers.

The EEM24018 electric water heater is capable of providing an unlimited supply of hot water to consumers. Its hot water temperature typically ranges from 80° to 140°F, but if you want a particular value, you can manually configure it by rotating the knob in the front panel. The knob allows the user to modify the temperature in small increments, depending on the requirement.

This small tankless water heater has a Self-Modulating Technology that allows it to dissipate input energy based on how much hot water is needed. This in turn saves energy that can be later apportioned for another hot water session. The lower the energy consumed, the lower the cost for the water heater to operate—recycling the process makes it cost-effective over time.

Its compact size makes it ideal for small households (can be wall-mounted), and inevitably saves valuable space. Also, its simple yet stylish design appeals to many customers.

Remember: if you do want to purchase and install these types of products, consult a local professional first to ensure you meet the correct requirements and avoid further compatibility issues.