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10 Best Tankless Water Heaters 2025 in the United States

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Our Top Picks

#1

Winner

EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology

Rating
10.0
Chosen by1,325
Flow Rate (Gallons Per Minute - GPM)
Temperature Rise
Energy Source (Gas vs. Electric)

Most important from
5648 reviews

Flow Rate (Gallons Per Minute - GPM)
The unit handles a 2.5 gallons per minute shower flow with ease, providing unlimited hot water for single users without issues.
Temperature Rise
Temperature control is simple and precise, allowing safe settings to prevent scalding while maintaining comfort.
Energy Source (Gas vs. Electric)
Delivers steady hot water quickly and reliably, effectively preheating to reduce propane usage or serve as a backup system.
Installation Requirements
Installation requires careful adherence to instructions and proper electrical upgrades, including a 60-amp breaker and thicker wiring for safe operation.
Size and Dimensions
Compact design fits almost anywhere and looks sleek, making it ideal for tight spaces with limited room.

The EcoSmart ECO 11 is a compact electric tankless water heater designed primarily for small-scale or point-of-use applications like a bathroom sink or office breakroom. It delivers a flow rate between 1.3 and 3.1 gallons per minute, which means it can provide steady hot water for low-flow needs but might struggle with larger demands such as multiple full bathrooms running simultaneously. The patented self-modulating technology keeps water temperature consistent within 1 degree, which is great for comfort and energy savings. Speaking of energy, this unit is quite efficient, converting 99% of electricity into heat and only heating water when you need it, helping reduce your utility bills compared to traditional tank heaters. Installation is flexible because of its small size—about 11.5 by 8 by 3.75 inches—and wall-mount design, saving space and making it ideal for tight areas. It operates at 240 volts and requires a 54-amp electrical draw, so your home's electrical system must support this.

Maintenance needs are minimal thanks to the electric operation and durable components, backed by a lifetime warranty on key parts. This model’s maximum temperature is 140°F and it’s not designed for whole-home use in larger households. For those seeking a simple, efficient solution for a small water heating point, the EcoSmart ECO 11 serves as a solid choice, though bigger homes may want to consider more powerful models.

Rating
10.0
Chosen by1,325
Flow Rate (Gallons Per Minute - GPM)
Temperature Rise
Energy Source (Gas vs. Electric)

Most important from
5648 reviews

Flow Rate (Gallons Per Minute - GPM)
The unit handles a 2.5 gallons per minute shower flow with ease, providing unlimited hot water for single users without issues.
Temperature Rise
Temperature control is simple and precise, allowing safe settings to prevent scalding while maintaining comfort.
Energy Source (Gas vs. Electric)
Delivers steady hot water quickly and reliably, effectively preheating to reduce propane usage or serve as a backup system.
Installation Requirements
Installation requires careful adherence to instructions and proper electrical upgrades, including a 60-amp breaker and thicker wiring for safe operation.
Size and Dimensions
Compact design fits almost anywhere and looks sleek, making it ideal for tight spaces with limited room.
#2

Rheem RTGH-95DVLN-3 RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel

Rating
10.0
Flow Rate
Size and Installation
Temperature Rise

Most important from
140 reviews

Flow Rate
Kitchen is 50+ feet away, and the water heats up faster than the tank heater it replaced.
Size and Installation
The unit is larger than some, but not as heavy as most. The installation was fairly straightforward.
Temperature Rise
Once all the plumbing was complete, we plugged it in and only had to adjust the temperature up 5 degrees. It's running great and has had no issues.

The Rheem RTGH-95DVLN-3 is a solid choice for those in need of a tankless water heater, especially for residential use. With a flow rate of up to 9.5 gallons per minute, it can easily meet the hot water demands of larger households or simultaneous usage across multiple fixtures. Its energy efficiency rating of 0.93 ensures that it operates economically, which can translate to lower energy bills over time.

One standout feature is the integrated digital display, making it easy to monitor and adjust temperature settings, which range from 100 to 140 degrees Fahrenheit. This adaptability allows users to find a comfortable temperature that suits their needs. Additionally, the natural gas fuel type is generally more efficient than electric options, further enhancing its appeal.

On the downside, installation can be a bit tricky if you're not familiar with gas appliances. It requires a wall-mounted setup and adequate venting, which might necessitate professional installation, adding to the cost. The warranty coverage, while decent with a 1-year labor and 5-year parts warranty, might be considered lacking compared to competitors that offer longer terms.

Another point to consider is that the heater's weight (about 59.9 pounds) and size (17.7”W x 23.7”H) may pose challenges during installation, especially in tighter spaces. It’s essential to ensure that your home can accommodate this unit before purchasing.

The Rheem RTGH-95DVLN-3 is a robust option for families seeking efficient hot water solutions. Its high flow rate and energy efficiency make it a strong contender in the tankless water heater market, but potential buyers should weigh the installation requirements and warranty duration against their specific needs.

Rating
10.0
Flow Rate
Size and Installation
Temperature Rise

Most important from
140 reviews

Flow Rate
Kitchen is 50+ feet away, and the water heats up faster than the tank heater it replaced.
Size and Installation
The unit is larger than some, but not as heavy as most. The installation was fairly straightforward.
Temperature Rise
Once all the plumbing was complete, we plugged it in and only had to adjust the temperature up 5 degrees. It's running great and has had no issues.
#3

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

Rating
9.8
Flow Rate
Energy Efficiency
Size and Installation

Most important from
834 reviews

Flow Rate
The unit provides endless hot water, even for a household with high demands like three boys.
Energy Efficiency
The reduced electricity bills were a noticeable benefit.
Size and Installation
Installation was straightforward and the unit worked exactly as intended. The compact size and quick heating were impressive.

The Rheem RTEX-24 24kW 240V Electric Tankless Water Heater offers a robust solution for continuous hot water supply with its impressive flow rate of up to 5.9 gallons per minute, making it suitable for households with moderate to high hot water demands. One of its standout features is the 99.8% energy efficiency, which helps in reducing energy costs and promoting eco-friendliness. The electric fuel type simplifies installation and maintenance compared to gas models, although it does require a 240V electrical connection, which some homes may need to upgrade to accommodate.

The compact dimensions (17.63”W x 18.25”H x 3.5”D) and wall-mount design make it space-efficient and ideal for small utility areas, while the digital temperature display and ON/OFF dial control provide ease of use and precise temperature adjustments. Additionally, the self-modulating power control enhances efficiency by only using the necessary amount of power based on the water flow rate.

However, the temperature rise might be limited during peak usage in colder climates, potentially requiring additional units for larger homes. Potential buyers should consider the installation requirements and whether their household electrical setup can support the unit. Those looking for a reliable, energy-efficient, and continuous hot water supply will find the Rheem RTEX-24 a compelling option, especially in moderate climates and homes with appropriate electrical infrastructure.

Rating
9.8
Flow Rate
Energy Efficiency
Size and Installation

Most important from
834 reviews

Flow Rate
The unit provides endless hot water, even for a household with high demands like three boys.
Energy Efficiency
The reduced electricity bills were a noticeable benefit.
Size and Installation
Installation was straightforward and the unit worked exactly as intended. The compact size and quick heating were impressive.

Buying Guide for the Best Tankless Water Heaters

Choosing a tankless water heater can be a smart way to ensure you have hot water on demand without taking up much space or worrying about running out. Unlike traditional heaters with storage tanks, tankless models heat water only when it's needed, making them energy-efficient and generally more durable over time. To find the best fit for your household, it's essential to understand the main specifications and features, as these will directly affect your experience and satisfaction.
Flow Rate (Gallons Per Minute - GPM)Flow rate measures how much hot water the unit can provide at once, typically shown in gallons per minute (GPM). This is important because if the flow rate is too low, you might struggle to use hot water in multiple places at the same time (like a shower and kitchen sink). Lower GPM units (around 2-4 GPM) work well for small households or single fixtures, while larger homes or those who need hot water at several points at once should look at higher GPM units (6+ GPM). To pick the right flow rate, add up the GPM of appliances you normally use together at peak times; choose a model that covers your total need.
Temperature RiseTemperature rise tells you how much a heater can increase the water's temperature as it flows through. This matters because the incoming water is colder in some places or during certain seasons. Units are rated based on how much they can heat the water at a given flow rate. If you live in a colder area, or want extra-hot showers, choose a model that can deliver a higher temperature rise at your required flow rate. Manufacturers often provide charts; match your expected flow and local cold water temperature to select the right fit.
Energy Source (Gas vs. Electric)Tankless water heaters can be powered by natural gas, propane, or electricity. Gas models usually provide higher flow rates and can keep up with larger demand, while electric models are often more compact and easier to install in smaller spaces. The choice comes down to what's available in your home and your hot water use. If you need high capacity or already have a gas line, gas may be better. For smaller needs, or if you want a simpler setup, electric could be the way to go.
Installation RequirementsInstallation involves factors like ventilation for gas models, electrical capacity for electric ones, and space for fitting the unit on a wall. Gas models need proper venting to the outside, which can add to the installation steps, while electric heaters often require an upgraded electrical panel. Consider what's easier and feasible in your home; if your installation location can't easily be adapted, that should guide your choice.
Size and DimensionsWhile tankless heaters are much smaller than traditional tanks, they still come in different sizes. Size affects where you can place your unit, especially if you want to install it in a tight spot, like under a sink or in a closet. Measure your available space and make sure the unit you pick will fit comfortably, including space for any necessary maintenance.
Maintenance NeedsTankless units generally need less day-to-day attention than tanks, but they should still be cleaned (descaled) annually, especially if you have hard water. Some models make this easier than others. If you want minimal hassle, look for units with simple maintenance requirements and easy access for servicing. Think about your ability and willingness to keep up with maintenance when making your choice.

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