Best tankless water heater 2022

Which is the best tankless water heater in the UK?

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The 10 best tankless water heaters to buy in the UK

The top 10 list of the best tankless water heaters lists various brands and prices

Review10Best compares the best tankless water heaters in the UK and selects the one by Rheem as the best tankless water heater. In a tankless water heater buying guide, you can read more about the features of the different tankless water heaters and see a recommendation on which tankless water heater to buy in the UK in 2022. By considering the top list of tankless water heaters, you can find the best tankless water heaters and save time shopping online.


Table of contents

  1. Read the ultimate tankless water heater buying guide
  2. View the tankless water heater picks and see how they rank in the top list

VIEW THE TOP 10 LIST →


Best tankless water heaters: A complete buying guide

All you need to know before buying a great tankless water heater

Picture of a tankless water heater

Finding the best tankless water heater system for your home can help save a lot of money in energy bills, although knowing what to look for in a heating system can be challenging for anyone that isn’t a plumber. Given the cost of paying for a new heating system, you will want to put a lot of thought and consideration into your decision, which is not always easy if you are unfamiliar with what a tankless water heater is and how to choose the right one for your home.

To help with this, we have created a handy buying guide that covers all the information that you need to know to find the best tankless water heaters for your home.

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What are tankless water heaters?

As the name suggests, a tankless water heater is a type of water heating system that does not use a large water tank to store heated water. Instead, cold water passes through a pipe and into the heating unit, which uses either a gas burner or electric element to instantly heat the water. Whenever you turn on hot water, you instantly get a constant supply as there is no need to wait for a tank to fill with heated water. Therefore, a good tankless water heater makes hot water very convenient and energy-efficient.

Why should you buy a good tankless water heater?

One of the major benefits of using tankless water heaters is reduced energy consumption. Because there is no tank to fill and store with hot water, it can help to reduce water heating bills. Furthermore, while the initial cost of installation is higher than a tanked water heater, the best tankless water heaters are much more durable so will last significantly longer. This means you can save money over the long term, making it a fantastic investment for many homeowners.

Another picture of a tankless water heater
How to choose the right tankless water heater?

Choosing a new tankless water heater can be daunting for those unfamiliar with water heating systems. So here are some things to consider that can make the process easier:

  • Hot Water Consumption: You need to determine how much hot water you consume daily so that you can select a tankless water heater that meets the demand. Simply list all the fixtures in your home that use hot water at any time (e.g. faucet, shower head, dishwasher) and combine their flow rates. To check flow rate, simply refer to the manufacturer instructions for any fixture you’ve bought or check online for a rough estimate of each fixture.
  • Temperature Rise: This refers to the temperature that the heater uses to warm incoming water to the desired temperature. To calculate, you need to determine the average temperature of incoming water and subtract from the desired incoming temperature.
  • Power Source: A tankless water heater is either gas-powered or electric, so consider which is best for your needs. Electric is suitable for smaller water heaters designed for point of use (e.g. heating water for just the shower), while gas-powered water heaters are best for an entire household’s water heating.
What is the best kind of tankless water heater in the UK?

There are two main types of tankless water heaters available to buy:

  • Gas-powered Tankless Water Heaters: Gas-powered systems are more powered and the most used, being the best tankless water heater for an entire household. However, you need to ensure that appropriate piping is in place and consider its location relative to where the heater will go, otherwise extensive installation work may be necessary.
  • Electric Tankless Water Heaters: Electrically powered systems are only recommended for point of use rather than a whole household, as it puts too much strain on the electrical supply when forced to heat too much water. It is more affordable to install, however.
…are you ready for the best picks of 2022?

Top 10 list of tankless water heaters in the UK (December 2022)

The bestseller list compares brands and their tankless water heaters. Which tankless water heater is the best?
Best choice TOP 1
Image of Rheem RTGH-95DVLP-2 tankless water heater
Rheem RTGH-95DVLP-2 Tankless Water Heater, Grey
  • For use indoor only
  • Recirculation pump ready kit ready
  • Exclusive Hot Start Programming minimizes cold water burst by staying in ready-fire…
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Image of thermomate ELEX5.5 tankless water heater
Thermomate ELEX5.5 Instant Electric Water Heater with Backlit LED Display, 5.5kW Tankless Hand Wash for Basins Sinks, Over/Under Sink Installation
  • TWO INSTALLATION APPLICATIONS OPTIONAL- Functional for both over sink and under sink…
  • EXCEPTIONALLY DURATION- Built in high quality alloy bare heating element, it is corrosion-resistant…
  • CONCEALED AUTOMATIC ROTATION LED DISPLAY- Features a new upgrade concealed automatic…
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TOP 3
Image of Rheem RTEX-18 tankless water heater
Rheem 18kW 240V Tankless Electric Water Heater
  • Threaded for easy replacement, simple installation, digital temperature display
  • Simple installation – bottom 3/4 inch NPT water connections
  • Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to…
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TOP 4
Image of SUDEG  tankless water heater
SUDEG LPG Hot Water Heater,18L/36KW/4.8 GPM Instant On-Demand Boiler, Stainless Steel Tankless Gas Water Heater with Shower Head Kit for Home/Apartment/Camping Use Silver
  • Applications - This 18L tankless water heater is the best-selling water heater on…
  • Wall-Mounted Design - Portable design for carry on easily. It can bring a amazing…
  • Summer/ Winter Mode - This gas instant water heater can also provide summer/winter…
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TOP 5
Image of Ecosmart ECO 11 tankless water heater
Ecosmart Green Energy Prod ECO 11 Tankless Water Heater, Electric, 11-kW - Quantity 1
  • Maximum Temperature: 140 farad
  • Water Connection Size: 1/2 in.
  • Water Connection Location: Side
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TOP 6
Image of Rheem RTEX-27 tankless water heater
Rheem 240V 3 Heating Chambers RTEX-27 Residential Tankless Water Heater, GRAY
  • Threaded for easy replacement, simple installation, digital temperature display
  • Simple installation – bottom 3/4 inch NPT water connections
  • Durable Copper immersion three heating elements, field Serviceable
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TOP 7
Image of Stiebel Eltron 234467 tankless water heater
Stiebel Eltron DHE Connect 18/21/24 Tankless Water Heater 18-24kW Energy Efficiency Class: A
  • Rated Voltage 1 = 380 V
  • Water Connection = 1/2 inch
  • Material A Pressure chamber tray = Plastic
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TOP 8
Image of Fockety Focketycqtgp82vr4-13 tankless water heater
Electric Tankless Water Heater,3KW Instant Electric Hot Water Heater with Self-modulating,Digital Display Hot Residential Electric Water Heater for Bathtub RV Whole House Shower Sink Small(UK)
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TOP 9
Image of Asixxsix Asixx3pcyuvrn0e-03 tankless water heater
Instant Water Heater, 5.5KW at 220 Volts Mini Instant Electric Water Heater Tankless 3 Seconds Hot Water System, One-Button Operation(Black)
  • AFTER-SALES SERVICEWe will provide you with satisfactory products and services. If…
  • APPLICABLE SCENEIt can be installed in the kitchen, rest room, bathroom, bar, school,…
  • ADJUSTABLE CONTROLSay goodbye to hot and cold, intelligent constant temperature technology,…
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TOP 10
Image of Zerodis Zerodis8vqhd57fos tankless water heater
220V 6500W Tankless Instant Electric Hot Water Heater with Shower Head for Home Bathroom Shower
  • Safe and long lifespan, automatic power-off when water is off and over-temperature…
  • Large LED screen shows temperature clearly, touch button for easy operation
  • Low water pressure to start, users of higher floors can enjoy pleasant experience…
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Affiliate Disclosure

We participate in the Amazon Associates Program. As an Amazon Associate we earn from qualifying purchases. For the list of the best tankless water heaters, we consider only products that are available on Amazon while the ranking is based on factors such as customer reviews, number of sales and keyword. It is not a tankless water heater test. Last Update: 2022/12/10.