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The Best Tankless Water Heaters

Rheem, Rinnai (Illustration by Today Decision) (Photos from Amazon)

A reliable supply of hot water is essential for every home, making daily routines more comfortable and efficient.

Traditional water heaters with bulky tanks are becoming a thing of the past, replaced by sleek, energy-efficient tankless water heaters.

These modern devices ensure you have hot water whenever you need it, without waiting. In this article, we’ll guide you through the best tankless water heaters available, highlighting their benefits and helping you find the perfect fit for your home. 

1

Best Energy Efficiency

Best Energy Efficiency
It provides between 1.3 and 3.1 gallons per minute, depending on the inlet water temperature.
from Amazon May be out of stock
Dimensions8″W x 11.5″H
Maximum flow rate3.1 Gallons Per Minute
Capacity2 Gallons
Power sourceAC_DC
MaterialPlastic
Heat output11 Kilowatts
Buy if…
  • you have limited space.
  • you require temperature consistency.
  • you want to save on energy costs.
  • you need a unit for low-flow applications.
  • you need on-demand hot water.
  • you value a small form factor.
  • you need up to 3.1 GPM flow rate.
  • you require controlled flow rates.
Don’t buy if…
  • you need hot water for multiple bathrooms.
  • you require high-flow applications.
  • you lack sufficient amperage.
  • you need a large water heater.
  • you dislike wall-mounted units.
  • you have ample installation space.

The EcoSmart electric tankless water heater provides endless on-demand hot water. Its advanced technology ensures you never run out of hot water, making it ideal for small sinks, bathrooms, and office breakrooms. 

This unit continuously monitors water temperature and controls flow rates, maintaining consistent performance within 1 degree of the selected temperature.

This tankless water heater is 90% smaller than traditional tank heaters, saving significant space. With dimensions of 11.5 x 8 x 3.75 inches, it can be installed on a wall or at the point of use. 

This feature makes it a practical solution for areas with limited space. It provides between 1.3 and 3.1 gallons per minute, depending on the inlet water temperature.

Energy efficiency is a key benefit of the EcoSmart tankless water heater. It is 99% thermal energy efficient, heating water only when needed.

Many consider it the best tankless water heater for its compact size and energy savings.

This contrasts with tank heaters that maintain water temperature constantly, even when not in use, leading to higher energy consumption.

The EcoSmart ECO 11, with its 13-kilowatt capacity, is best for low-flow applications. It is suitable for providing hot water for a bathroom, small sink, or office breakroom. 

This model ensures energy savings and space efficiency, making it one of the best tankless water heaters for small-scale hot water needs.

EcoSmart  Electric Tankless Water Heater Reviews

  • Easy installation: Customers think the installation process is straightforward and user-friendly.
  • Energy efficiency: Users said it significantly reduces their energy bills.
  • Water pressure issues: Users said low-flow fixtures might not activate the unit.
  • Space-saving: Many appreciate its compact size, freeing up more space.
  • Fluctuating temperatures: Some users experienced inconsistent water temperatures with low-flow applications.
  • Quick heating: Many users like that it heats water quickly and on-demand.
  • Noise: Customers think it can create noise interference with other electronic devices.
2

Best Compact Design

Best Compact Design
The unit’s advanced self-modulation technology adjusts power to meet hot water demand, enhancing energy efficiency and performance.
from Amazon May be out of stock
Dimensions14.5″W x 18.25″H
Maximum flow rate4.4 Gallons Per Minute
Capacity18 Gallons
Power sourceAC_DC
MaterialStainless steel
Heat output18 Kilowatts
Buy if…
  • you prefer LED digital displays.
  • you want advanced self-modulation.
  • you need a high flow rate.
  • you want easy installation.
  • you want accurate temperature adjustments.
  • you need a compact water heater.
Don’t buy if…
  • you need hot water for multiple bathrooms.
  • you dislike digital controls.
  • you prefer non-electronic models.
  • you need a larger unit.
  • you dislike copper elements.

The Rheem tankless electric water heater offers precise temperature control with its external digital thermostatic control and LED display. This feature ensures an accuracy of +/- 1 degree, providing consistent hot water as needed. 

The unit’s advanced self-modulation technology adjusts power to meet hot water demand, enhancing energy efficiency and performance.

Durability is a key feature of this water heater. It uses copper immersion heating elements
Components in the heater that use copper to transfer heat efficiently.
that are field serviceable, ensuring a long lifespan and easy maintenance. These elements support a flow rate of up to 4.4 GPM, making it suitable for medium-demand applications.

Installation of this water heater is straightforward, thanks to the bottom 3/4-inch NPT water connections
A standard for threaded pipe connections used in plumbing.
. The threaded design allows for easy replacement and simplifies the installation process. 

The digital temperature display adds to the convenience, enabling precise adjustments and monitoring.  It stands out as one of the best tankless water heaters due to its combination of advanced technology and user-friendly features. 

Its self-modulating capability and high flow rate make it a reliable choice for consistent hot water supply. For those seeking efficiency and durability, this model is a strong contender in the market.

Overall, its precise temperature control, easy installation, and durable components position it as one of the best tankless water heaters available. Its advanced features cater to users looking for reliable and efficient hot water solutions.

Rheem Tankless Electric Water Heater Reviews

  • Easy installation: Customers said it’s simple to set up, even for DIY projects.
  • Energy savings: Users think it reduces energy bills significantly.
  • Flow issues: Users said low-flow fixtures might not activate the heater.
  • Consistent hot water: Many appreciate the steady supply of hot water.
  • Error codes: Some users reported frequent error messages disrupting performance.
  • Customer support: Customers appreciate the helpful and responsive technical support team.
3

Best Performance Reliability

Best Performance Reliability
It features a digital temperature display, preset temperature buttons, and memory settings.
from Amazon May be out of stock
Dimensions16.63″W x 14.5″H
Maximum flow rateN/A
CapacityN/A
Power sourceHard wiring required
MaterialCopper
Heat outputN/A
Buy if…
  • you need advanced flow control.
  • you require noise-free operation.
  • you want auto-modulation features.
  • you need scalding prevention.
  • you value eco-friendly units.
Don’t buy if…
  • you need vented units.
  • you have limited electrical service.
  • you need lower-wattage units.
The Stiebel Eltron tankless water heater offers continuous hot water with its advanced


This feature ensures constant comfort by maintaining the desired water temperature and reducing flow slightly if demand exceeds capacity. You won’t experience interruptions during hot showers with this unit.

This water heater is an excellent space- and energy-saving device. Its compact, sleek white design fits well in various spaces and provides endless hot water for the entire house without requiring. 

The eco-friendly unit saves energy with auto-modulation and electronic water flow control, and the savings monitor shows your energy cost savings.

Operating this water heater is straightforward. An electronic switch activates the heater, which operates noise-free. It features a digital temperature display, preset temperature buttons, and memory settings. The interior solid copper heating system ensures efficient performance.

The Tempra 24 Plus model is 24kW, 240V, and requires a minimum recommended electric service of 150 A. It offers an output water temperature range of 68° to 140°F. 

This model includes the option to set a maximum hot water temperature to 109°F, preventing the possibility of scalding in some installations.

Stiebel Eltron includes reliable warranties with their top-rated electric tankless water heaters. The Tempra 24 Plus comes with a 7-year leakage warranty and a 3-year parts warranty, ensuring long-term performance and reliability. 

This model is a top contender for the best tankless water heater, combining advanced features and dependable service.

Overall, it stands out as one of the best tankless water heaters due to its efficient performance, space-saving design, and advanced technological features. It meets the needs of modern households looking for reliable and continuous hot water.

Stiebel Eltron Tankless Water Heater Reviews

  • Easy installation: Customers think it’s simple to set up with clear instructions.
  • Consistent hot water: Many appreciate the reliable and continuous hot water supply.
  • High installation costs: Some customers think the electrical setup can be pricey.
  • Energy savings: Users report significant reductions in energy bills.
  • Space-saving: Customers like its compact design that frees up space.
  • Error codes: Some users reported frequent error messages disrupting performance.
  • High capacity: Users say it handles multiple showers simultaneously.
4

Best User-Friendly Interface

Best User-Friendly Interface
It includes a digital display and touch control panel, simplifying temperature settings.
from Amazon May be out of stock
Dimensions11.14″W x 15.87″H
Maximum flow rate‎2.3 Gallons Per Minute
CapacityN/A
Power sourceCorded electric
MaterialAluminum
Heat output‎14000 Watts
Buy if…
  • you want energy efficiency.
  • you need endless hot water.
  • you want a compact unit.
  • you require safe operation.
  • you prefer self-modulating heaters.
  • you use multiple faucets.
Don’t buy if…
  • you have low amperage.
  • you require constant preheating.
  • you need a whole-house heater.

The ECOTOUCH tankless water heater delivers instant hot water with its powerful 14kW smart heating system. It ensures water temperatures of 120℉ or higher in seconds, eliminating the wait for preheating. 

This model is perfect for small apartments, accommodating showers, sinks, dishwashers, and washing machines without running out of hot water. Self-modulation technology in this heater adjusts power input based on the current flow rate and temperature setting.

This feature prevents scalding and enhances energy efficiency, making it one of the best tankless water heaters for saving on electric charges. The unit boasts a remarkable energy efficiency of 98%.

Convenience is another highlight of this tankless water heater. It includes a digital display and touch control panel, simplifying temperature settings. The screen provides useful information about the heater’s status, ensuring users have a clear understanding of its operation.

The compact design, comparable to a shoebox, allows for versatile installation at the point of use, such as in kitchens, bathrooms, bars, schools, and salons.

Safety is paramount with this water heater. It features multiple protections, including leakage protection, overheating protection, and auto-stop. Each unit undergoes strict testing and is ETL listed, qualifying for UL.

The design separates water and electricity lines, reducing the risk of leakage and scale buildup and promising years of reliable performance.

Overall, this unit is compact and energy-efficient, making it a strong contender among the best tankless water heaters available. Its advanced features and safety measures provide reliable hot water for various applications, ensuring user satisfaction.

ECOTOUCH  Electric Tankless Water Heater Reviews

  • Consistent hot water: Many appreciate the steady supply of hot water without fluctuations.
  • Space-saving: Customers like its compact design, freeing up storage space.
  • Compatibility problems: Some reported issues with LED fixtures flickering.
  • High flow rate: Users mentioned it handles multiple outlets well.
  • Short lifespan: Customers think the unit may not last as long as expected.
  • Effective heating: Users said it heats water quickly and efficiently.
  • Error codes: Some users reported frequent error messages disrupting performance
5

Best Outdoor Durability

Best Outdoor Durability
Enhanced scale detection in the heater reduces the risk of serious, long-term damage.
from Amazon May be out of stock
Dimensions13″W x 30″H
Maximum flow rateN/A
Capacity5.3 Gallons
Power sourceGas powered
MaterialN/A
Heat output81 Kilowatts
Buy if…
  • you need endless hot water.
  • you prefer energy efficiency.
  • you want high water pressure.
  • you have up to four appliances.
  • you require compact design.
  • you need a durable unit.
  • you prefer gas heaters.
  • you want scale detection.
  • you value long-term warranty.
  • you seek professional installation.
Don’t buy if…
  • you prefer electric heaters.
  • you need simple DIY installation.
  • you have low water demand.
  • you need minimal maintenance.
  • you lack space for installation.

The Rinnai V53DeP tankless hot water heater provides endless hot water throughout your home. Its compact and durable design fits seamlessly into any lifestyle. 

This tankless heater is highly energy-efficient, heating water only when necessary. This feature makes it one of the best tankless water heaters for conserving energy.

The unit offers a high-performance hot water flow rate of up to 5.3 GPM. This ensures a powerful, constant stream capable of serving up to four appliances simultaneously. 

Enhanced scale detection in the heater reduces the risk of serious, long-term damage. This makes it reliable and durable, promising optimal performance for years.

Professional installation is recommended to ensure optimal performance and longevity. Rinnai provides a Find a Pro page on their website to locate qualified technicians. 

This heater is guaranteed to last, backed by a 10-year warranty for the heat exchanger, a 5-year warranty for labor, and a 1-year warranty for parts.

Users on Reddit have highly suggested this product for its efficiency and reliability. Its compact design saves space, making it ideal for various home settings. With its advanced features and high flow rate, it stands out as one of the best tankless water heaters available.

This tankless water heater offers exceptional efficiency, durability, and performance. With its capability to provide endless hot water and a high flow rate, it stands out as a top choice for contemporary households.

The positive feedback from users further underscores its reputation as a reliable and efficient water 

Rinnai V53DeP Tankless Hot Water Heater Reviews

  • Consistent hot water: Many appreciate the steady supply of hot water.
  • High performance: Customers like that it handles multiple fixtures well.
  • Installation parts needed: Customers mentioned the need for additional installation parts.
  • Durable: Many found the unit reliable and long-lasting.
  • Temperature issues: Some users experienced lower than expected water temperatures.
  • Quiet operation: Users appreciate the quiet performance.
  • Water pressure: Some users noted reduced water pressure at times.

Tankless Water Heaters Reviews

Tankless water heaters have garnered a variety of feedback from users. Most commonly, people appreciate the endless hot water supply. This feature is particularly beneficial for large families or households with high hot water demand.

Many users highlight energy efficiency as a significant benefit. Tankless water heaters heat water only when needed, reducing energy consumption and lowering utility bills. This efficiency is a huge selling point for environmentally conscious consumers and those looking to save on energy costs.

User reviews frequently mention the compact size of tankless water heaters. These units save space compared to traditional water heaters, making them ideal for smaller homes or apartments. This aspect has positively impacted users’ living spaces by freeing up storage areas.

Overall, users express satisfaction with their tankless water heaters. They appreciate the reliability and convenience of having on-demand hot water. The combination of energy savings, space efficiency, and continuous hot water supply makes these heaters a popular choice.

Patterns in tankless water heater reviews show a strong preference for these benefits, leading to high overall user satisfaction. Many consider them the best tankless water heaters available, reflecting positively on their performance and reliability.

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