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10 Best Tankless Water Heaters 2026 in the United States

#1

Winner

10.0 score

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

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.

Rating
10.0
Chosen by1,399
Flow Rate
Energy Efficiency
Size and Installation

Most important from
3981 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.
#2
9.4 score

Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater 9.5 GPM, 199,900 BTUs

The Rheem RTG-95DVLN-3 is a natural gas tankless water heater designed for indoor use, offering a strong flow rate of 9.5 gallons per minute. This means it can supply enough hot water to run multiple fixtures at once—like a shower and dishwasher—making it suitable for medium to larger households. Its energy efficiency rating of 0.82 is decent for this type of non-condensing model, helping save on energy costs by only heating water on demand. The heater also includes a water-saving setting that claims to save up to 1,100 gallons annually, which is a nice bonus for reducing water waste.

Rating
9.4
Flow Rate
Energy Efficiency
Size and Installation

Most important from
165 reviews

Flow Rate
Delivers consistent, endless hot water that meets the demands of multiple fixtures simultaneously.
Energy Efficiency
Offers great value and strong performance that stands out among tankless water heaters.
Size and Installation
Installation requires professional expertise due to the need for water, gas, electricity, and proper venting connections.
#3
9.1 score

Rheem 11kW 240V Tankless Electric Water Heater

The Rheem RTEX-11 is a compact electric tankless water heater designed to deliver continuous hot water on demand. With a flow rate of up to 2.68 gallons per minute (GPM), it works well for point-of-use applications like a single bathroom or kitchen sink but might struggle to supply multiple outlets simultaneously. Its self-modulating power control helps maintain consistent water temperature, and the easy-to-read digital LED display allows you to adjust settings precisely. Operating on 240 volts with 11kW of power, it is energy efficient with a 99.8% efficiency rating, which can help reduce electricity costs compared to traditional tank heaters.

Rating
9.1
Flow Rate (Gallons Per Minute - GPM)
Temperature Rise
Energy Source (Gas vs. Electric)

Most important from
3981 reviews

Flow Rate (Gallons Per Minute - GPM)
Delivers flawless, reliable hot water for small homes over years of continuous use without tripping the main breaker.
Temperature Rise
Maintains consistent water temperature easily adjustable with a digital display, providing precise control.
Energy Source (Gas vs. Electric)
High energy efficiency helps reduce electricity costs compared to conventional tank heaters.
Installation Requirements
Installation is straightforward for those comfortable with electrical and plumbing work, making it a good DIY project.
Size and Dimensions
Compact design frees up valuable space compared to traditional tank water heaters, ideal for smaller homes or manufactured housing.

Top 10 Best Tankless Water Heaters 2026 in the United States

#1

Winner

10.0  score

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

Flow Rate: 5.9 GPM
Energy Efficiency: 99.8%
Fuel Type: Electric
Size and Installation: 17.63"W x 18.25"H x 3.5"D

Chosen by 1399 this week

Rheem 11kW 240V Tankless Electric Water Heater

Flow Rate (Gallons Per Minute - GPM): 2.68 Gallons Per Minute
Energy Source (Gas vs. Electric): Electric
Installation Requirements: 46-amp breaker, 240V, wall-mounted
Size and Dimensions: 8.25"W x 12.63"H
Maintenance Needs: Low; monitor sediment in hard water

Rheem 18kW 240V Tankless Electric Water Heater, Gray

Flow Rate: 4.4 GPM
Energy Efficiency: Advanced self-modulation tech
Fuel Type: Electric
Size and Installation: 14.5"W x 18.25"H, 3/4 inch NPT

Stiebel Eltron Tankless Water Heater - Tempra 29 Trend – Electric, On Demand Hot Water, Eco, White

Flow Rate (Gallons Per Minute - GPM): 3-4 gallons per minute
Energy Source (Gas vs. Electric): Electric
Installation Requirements: Needs 200-amp service; no venting
Size and Dimensions: 16.63"W x 14.5"H
Maintenance Needs: Periodic descaling if water hard

Stiebel Eltron Tankless Water Heater - Tempra 20 Trend – Electric, On Demand Hot Water, Eco, White

Flow Rate (Gallons Per Minute - GPM): 2.01 Gallons Per Minute
Energy Source (Gas vs. Electric): Electric
Installation Requirements: Wall-mounted, 240V, 125 amps, no vent
Size and Dimensions: 16.63"W x 14.5"H
Maintenance Needs: Low; monitor scale if hard water

Noritz GQ-C3261WX-FF US NG EZ Series Pro 11.1 GPM 199,900 BTU 120 Volt Residential Indoor/Outdoor Natural Gas Tankless Water Heater with Bluetooth Connectivity - Silver

Flow Rate (Gallons Per Minute - GPM): 11.1 gallons per minute
Temperature Rise: up to 140°F
Energy Source (Gas vs. Electric): Natural gas
Installation Requirements: Gas and venting setup needed
Size and Dimensions: 11.8 x 18.1 x 26.1 inches
Maintenance Needs: Periodic flushing to prevent buildup
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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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