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BEST TANKLESS WATER HEATERS OF 2026

Updated
Updated
BEST OF THE BEST
EcoSmart ECO 27
EcoSmart
ECO 27
EcoSmart ECO 27
Highly efficient tankless water heater designed to provide endless hot water while saving space and energy.
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Pros & Cons
PROS
  • Energy-efficient
  • Compact size
  • Precise temperature control
  • Good for multiple simultaneous uses
CONS
  • Requires professional installation
  • May need electrical upgrades
BEST BANG FOR THE BUCK
Rinnai V75iN
Rinnai
V75iN
Rinnai V75iN
Reliable and robust tankless water heater perfect for providing hot water to medium-sized homes.
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Pros & Cons
PROS
  • High flow rate
  • Instant hot water
  • Compact design
  • Safety features
CONS
  • Higher initial cost
  • Requires gas line installation
Stiebel Eltron Tempra 24 Plus
Stiebel Eltron
Tempra 24 Plus
Stiebel Eltron Tempra 24 Plus
Premium tankless water heater known for its advanced technology and efficient performance.
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Pros & Cons
PROS
  • Constant temperature output
  • Durable construction
  • Modern design
  • Easy installation
CONS
  • Higher initial cost
  • Requires professional installation
Takagi T-KJr2-IN-NG
Takagi
T-KJr2-IN-NG
Takagi T-KJr2-IN-NG
Is an efficient and compact tankless water heater ideal for small to medium-sized homes.
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Pros & Cons
PROS
  • Efficient performance
  • Compact size
  • Safety features
  • Flexible installation
CONS
  • Requires gas line installation
  • Limited flow rate for larger homes
Rheem RTEX-18
Rheem
RTEX-18
Rheem RTEX-18
Compact and efficient electric tankless water heater suitable for on-demand hot water needs.
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Pros & Cons
PROS
  • Energy-efficient
  • Compact size
  • Precise temperature control
  • Durable construction
CONS
  • Limited flow rate
  • Requires professional installation
BEST OF THE BEST
EcoSmart ECO 27
EcoSmart ECO 27
GPM: 6.5
Wattage: 27 kW
Dimensions: 17 x 17 x 3.75 inches
Weight: 14 pounds

The EcoSmart ECO 27 tankless water heater is a top choice for those seeking an energy-efficient solution for their hot water needs. With its compact design, it can be installed in small spaces, making it ideal for apartments and smaller homes.

The heater uses advanced self-modulating technology to adjust energy output based on the amount of hot water needed, ensuring maximum efficiency. It is capable of heating up to 6.5 gallons per minute, making it suitable for households with multiple hot water demands simultaneously.

The digital temperature control allows users to set the desired temperature in increments of 1 degree, providing precise control over the water temperature.

PROS
  • Energy-efficient
  • Compact size
  • Precise temperature control
  • Good for multiple simultaneous uses
CONS
  • Requires professional installation
  • May need electrical upgrades
BEST BANG FOR THE BUCK
Rinnai V75iN
Rinnai V75iN
GPM: 7.5
Wattage: 180,000 BTU
Dimensions: 14 x 9.3 x 23 inches
Weight: 46 pounds

The Rinnai V75iN is a natural gas-powered tankless water heater known for its reliability and high performance. It can deliver up to 7.5 gallons per minute, making it suitable for medium-sized households with moderate hot water needs.

The unit features a compact design that can be installed indoors, conserving valuable space. The Rinnai V75iN is equipped with a digital controller that allows for easy temperature adjustments and monitoring.

It also has a built-in recirculation pump, which ensures that hot water is available instantly, reducing water wastage. Additionally, the unit is designed with safety features such as temperature lock and error code indicator.

PROS
  • High flow rate
  • Instant hot water
  • Compact design
  • Safety features
CONS
  • Higher initial cost
  • Requires gas line installation
Stiebel Eltron Tempra 24 Plus
Stiebel Eltron Tempra 24 Plus
GPM: 4.68
Wattage: 24 kW
Dimensions: 14.5 x 16.5 x 4.6 inches
Weight: 15.4 pounds

The Stiebel Eltron Tempra 24 Plus is a top-of-the-line electric tankless water heater that offers advanced features and reliable performance. It utilizes advanced flow control technology to ensure a constant temperature output regardless of water flow.

The unit is capable of delivering up to 4.68 gallons per minute, making it suitable for households with moderate hot water demands. The Tempra 24 Plus features a sleek, modern design with an easy-to-use digital display for temperature adjustments.

It also has a robust copper heating system that ensures durability and long-term performance. The unit is designed for easy installation and requires minimal maintenance.

PROS
  • Constant temperature output
  • Durable construction
  • Modern design
  • Easy installation
CONS
  • Higher initial cost
  • Requires professional installation
Takagi T-KJr2-IN-NG
Takagi T-KJr2-IN-NG
GPM: 6.6
Wattage: 140,000 BTU
Dimensions: 20.3 x 13.8 x 6.7 inches
Weight: 38 pounds

The Takagi T-KJr2-IN-NG is a natural gas tankless water heater designed for efficiency and compactness. It provides up to 6.6 gallons per minute, making it suitable for small to medium-sized households.

The unit features a compact design that allows for flexible installation options, including indoor installation. The T-KJr2-IN-NG is equipped with advanced safety features, including freeze, overheat, and surge protection.

It also has a digital remote control for easy temperature adjustments. The unit's energy efficiency helps reduce utility bills while providing a continuous supply of hot water.

PROS
  • Efficient performance
  • Compact size
  • Safety features
  • Flexible installation
CONS
  • Requires gas line installation
  • Limited flow rate for larger homes
GPM: 4.4
Wattage: 18 kW
Dimensions: 14.5 x 14.5 x 4 inches
Weight: 8.5 pounds

The Rheem RTEX-18 is an electric tankless water heater designed for efficiency and convenience. It features a compact design that allows for easy installation in tight spaces. The unit provides up to 4.

4 gallons per minute, making it suitable for households with moderate hot water demands. The RTEX-18 is equipped with an easy-to-use digital temperature control for precise adjustments. It also features durable copper immersion heating elements for long-lasting performance.

The unit's on-demand heating system ensures that hot water is available whenever needed, reducing energy consumption and utility costs.

PROS
  • Energy-efficient
  • Compact size
  • Precise temperature control
  • Durable construction
CONS
  • Limited flow rate
  • Requires professional installation

How our picks compare

SpecificationEcoSmart ECO 27Rinnai V75iNStiebel Eltron Tempra 24 PlusTakagi T-KJr2-IN-NGRheem RTEX-18
GPM6.57.54.686.64.4
Wattage27 kW180,000 BTU24 kW140,000 BTU18 kW
Dimensions17 x 17 x 3.75 inches14 x 9.3 x 23 inches14.5 x 16.5 x 4.6 inches20.3 x 13.8 x 6.7 inches14.5 x 14.5 x 4 inches
Weight14 pounds46 pounds15.4 pounds38 pounds8.5 pounds