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 TINTON LIFE 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 →
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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 (May 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 TINTON LIFE 71220LLDJAZS-2 tankless water heater
TINTON LIFE 220V Instant Tankless Electric Hot Water Heater Faucet Kitchen Instant Heating Tap Water Faucet with LED Digital Display(Small Under Inflow)*
  • Warning: DON'T test it in your hands before installing finished, that's would be…
  • Package with a Socket Converter!
  • ABS engineering plastics, high temperature resistant, soft and strong, not easy to…
BUY NOW*
TOP 2
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*
Offer* TOP 3
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 5
Image of Focket Focketo3evdwx8yt-13 tankless water heater
Focket Electric Water Heater, White Rapid Heating Mini Tankless Instant Hot Water Heater Hot Cold Dual-use Under Sink Water Heater, Electricity Saving and Water Saving for Home Washing (220V 3000W)*
  • SATISFACTION GUARANTEED A YEAR WARRANTY, FREE RETURN AND EXCHANGE!We promises every…
  • WIDELY APPLICATIONS This is a water heater for the application of changing the cold…
  • SAFE USE Safe heater, electricity saving, water saving, no pollution, no exhaust…
BUY NOW*
TOP 6
Image of Zerodis Zerodisdu1ya5p0me tankless water heater
Zerodis 6500W Tankless Water Heater Electric Instant Hot Water Heater with Shower Head for Home Bathroom Shower*
  • PackageComes with a shower spray head, outlet pipe and a set of installation accessories.…
  • Automatic Power-offThe electric water heater is safe and long lifespan, automatic…
  • Large LED ScreenThe tankless water heater with large LED screen, it can show temperature…
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TOP 7
Image of HEEPDD HEEPDDrsgnpdahfq-01 tankless water heater
Mini Water Heater, 3000W Electric Tankless Instant Hot Water Heater for Bathroom Kitchen Washing UK Plug 220V -240V(Black)*
  • LCD Digital Temperature Display---The temperature sensor transmits the temperature…
  • Safe and Durable---This instant water heater is made of high quality stainless steel…
  • Easy Installation---This product is a high-power appliance that requires ≥2.5mm2…
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TOP 8
Image of Garosa Garosanqyr7fmu2c-03 tankless water heater
Mini Water Heater, 220V 5.5KW Instant Electric Tank-less Water Heater Auto Power Off Shower Hot Water System for Kitchen Bathroom Washing (Black)*
  • EASY TO USE: It can be installed in the kitchen, rest room, bathroom or any other…
  • PERFECT CHOICE: This is a lightweight electric water heater with a perfect combination…
  • LEAKAGE PROTECTION: Our water heater has built-in leakage protection device. Automatically…
BUY NOW*
TOP 9
Image of EUNEWR  tankless water heater
Mini Instant Water Heater, 3000W Electric Tankless Instant Hot Water Heater, 220V Under Sink Water Heaterfor Sink Tap Bathroom Kitchen Washing (Red)*
  • LCD Digital DisplayThe temperature sensor transmits the temperature in real time,…
  • Easy InstallationThis product is a high-power appliance that requires ≥2.5 Square…
  • Safe and DurableThis instant water heater is made of high quality stainless steel…
BUY NOW*
TOP 10
Image of CAMPLUX ENJOY OUTDOOR LIFE BW158C tankless water heater
Camplux BW158C CE Certified GAR Standard Tankless Gas Water Heater with Rain Cap, 6L Outdoor Instant Gas Shower for Horse Camping RV Trip*
  • 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, this CE certified gas boiler is…
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: 2021/05/16.