Best tankless water heater 2021

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 EUNEWR 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 2021. 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

SEE THE TOP 10 LIST →
(skip buying guide)


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.

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 2021?

Top 10 list of tankless water heaters in the UK (October 2021)

The bestseller list compares brands and their tankless water heaters. Which tankless water heater is the best?
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Best choice* TOP 1
Image of EUNEWR TP01144-WML tankless water heater
Mini Electric Water Heater, 3000W Instant Tankless Hot Water Heater with LCD Display, Under Sink Water Heater for Kitchen Bathroom Washing (Black)*
  • LCD Digital DisplayThe temperature sensor transmits the temperature in real time,…
  • Easy InstallationThe package includes an installation manual and it is very easy…
  • Safe and DurableThis instant water heater is made of high quality stainless steel…
BUY NOW*
Offer* TOP 2
Image of Ymiko Ymikoqd0omi1n8g-13 tankless water heater
Mini Tankless Instant Hot Water Heater Under Sink Water Heater Bathroom Kitchen Washing for Hot and Cold Dual-use (220V UK Plug)*
  • INSTANT WATER HEATER: This is a high efficient water heater for the application of…
  • WIDE APPLICATION: This mini under sink water heater will meet your various needs…
  • LED INDICATOR LIGHT: With indicator light, save electricity and water, no pollution,…
BUY NOW*
TOP 3
Image of CAMPLUX ENJOY OUTDOOR LIFE BW422 tankless water heater
Camplux BW422 16L Tankless Propane Gas Hot Water Heater Portable Instant Camping Gas Shower Outdoor*
  • MULTIPLE APPLICATIONS - Elegant design and sturdy structure, perfect for domestic…
  • EASY TO INSTALL & USE - Compact and lightweight design for easy carrying whenever…
  • MULTIPLE PROTECTION - Flame failure protection, overheat protection, oxygen depletion…
BUY NOW*
TOP 4
Image of thermomate BE318S tankless water heater
Gas Water Heater, Thermomate BE318S 12L Instant Outdoor LPG Water Heater, Portable Tankless Propane Gas Boiler, Use for Camping Showers, Horses Washing, RV Trip…*
  • PLEASE NOTE- Please verify that this BE318S is the right size for your hot water…
  • ENERGY SAVING & ECO MODE- Compact structure with 11.5% energy saving technology.…
  • MULTIPLE PROTECTION CONFIGURATIONS- Flame failure protection will cut gas supply…
BUY NOW*
TOP 5
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…
BUY NOW*
TOP 6
Image of Weiyiroty Weiyirotymfyazxo9bv-02 tankless water heater
Electric Tankless Water Heater, 220V 3000W Mini Tankless Instant Hot Water Heater Bathroom Kitchen Washing with LED Indicator Light, Rust Proof, Corrosion Resistant(White)*
  • Stainless construction with stylish design, it is rust proof, corrosion resistant,…
  • LED indicator light to show you the power and heating status
  • Build-in turbo heating part and the blow off valve for safe heating system
BUY NOW*
TOP 7
Image of CAMPLUX BW264BC tankless water heater
Camplux BW264BC 10L Instant Gas Water Heater Outdoor, Tankless Portable Water Heater with Rain Cap, On-Demand LPG Boiler for Camping Shower RV Trip Horse Washing, A+*
  • CE CERTIFIED GAR STANDARD - To provide a safer bathing environment, Camplux BW264BC…
  • EASY TO INSTALL & USE - The water heater is equipped with basic installation…
  • WEATHERPROOF RAIN CAP - The stainless steel rain cap design can prevent rain, leaves,…
BUY NOW*
TOP 8
Image of ThermaQ Elite Touch tankless water heater
Elite Touch Instant Electric Water Heater Multi-Point or Single-Point Undersink Oversink Tankless Istantaneous (7kW)*
  • Perfect for Shower, bath or tap outlets
  • Suitable for Bathroom, Kitchen, Washroom, handwash or Utility
  • Overheat and dry run safety protection
BUY NOW*
TOP 9
Image of Haofy  tankless water heater
Mini Electric Water Heater, 3000W Tankless Instant Hot Water Heater Boiler with LCD Display, Under Sink Basin, Auto Power Off Shower Hot Water System for Kitchen Bathroom Washing (White)*
  • Energy conservation saves water waiting for hot water to reach the tap, reduces heat…
  • Constant temperature This electric temperature control device guarantees a constant…
  • Ensure safety Built-in leakage protection device. It turns off automatically due…
BUY NOW*
TOP 10
Image of CAMPLUX ENJOY OUTDOOR LIFE BW158BC tankless water heater
Camplux BW158BC 6L Instant Gas Water Heater with Rain Cap, CE Certified GAR Standard Tankless Propane Gas Boiler, Use for Outdoor Shower Camping RV Trip Horse Washing*
  • EASY TO OPERATE - Heat is easy to adjust via water knob and gas knob. LED temperature…
  • LIGHTWEIGHT COMPACT DESIGN - Camplux 6L gas shower comes with most of the necessary…
  • WEATHERPROOF RAIN CAP - Equipped with a rain cap, it is easily installed outdoor…
BUY NOW*
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: 2021/10/16.