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The 10 best tankless water heaters to buy in the UK

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.

How to choose the right tankless water heater in 2024?

Another picture of a 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.

Top 10 list of tankless water heaters in the UK (2024)

The bestseller list compares brands and their tankless water heaters. Which tankless water heater is the best?
Best choice TOP 1
Image of FVSTR FR750WT tankless water heater
Electric Tankless Water Heater, FVSTR on Demand Instant Hot Water…
  • POINT of USEThe sleek tankless water heater is compact as an oatmeal box, making…
  • SAFE and DURABLEApplied with multiple protection devices, every piece goes through…
  • CONVENIENT USEThe tankless water heater comes with digital display & touch control…
BUY NOW
TOP 2
Image of Lfhelper GWH18L tankless water heater
Lfhelper Gas Water Heater 18L Instant Outdoor LPG Water Heater Portable…
  • Versatile Applications - This gas water heater outdoor is designed to meet a range…
  • Convenient Wall-Mounted Design - Our tankless water heater features a portable design…
  • Energy Efficiency and Customization - Our 18L lpg water heater offers both summer…
BUY NOW
Offer TOP 3
Image of TOPEV SEN-RSQ-02 tankless water heater
3000W Instant Water Heater,Under Sink Water Heater with LCD Display,Tankless…
  • One Year Warranty We guarantee a one-year warranty service. If you have any quality…
  • Important Note This product should only be installed vertically and should not be…
  • Wide Compatibility & Energy-saving Design The instant water heater has a universal…
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TOP 4
Image of Briwellna FYK-P32NH55 tankless water heater
Briwellna Streamline Electric Water Heater 5.5KW, Undersink Tankless…
  • Easy InstallationComing with multi-language user's manual, it's easy to…
  • Multiple Security Protection Smart protection functions protect the product from…
  • Save Energy and Time Equipped with the latest integral cast aluminum heating technology,…
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TOP 5
Image of Btstil INTTH17655 tankless water heater
Btstil Instant Water Heater, 3000W Electric Tankless Fast Heating…
  • Widely ApplicationSuitable for kitchen sink, shower, hand washing, dishes washing…
  • Caution MeasuresVertical installation only, no horizontal installation allowed. Before…
  • LED IndicatorLED screen to show power and heating status. With the high heating power…
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TOP 6
Image of GEESEN GE550W tankless water heater
5.5kW Tankless Water Heater,240V Electric Water Heater with Digital…
  • Space Saving: This water heater has a compact appearance, which is very convenient…
  • Convenience: Multiple gear options, digital display gear and water temperature, easy…
  • Safe and Reliable: The instant hot water heater has a memory function or an automatic…
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TOP 7
Image of GEESEN GE tankless water heater
Upgrade Tankless Water Heater Electric 9KW 240V, On Demand Instant…
  • Simple Installation1/2-Inch Water heater connector. In order to install whole house…
  • Safety Insurance & Longer LifeOur tankless electric hot water heater 9KW are…
  • Saver Energy & SpaceWater is only heated when you need it, not stored in a hot…
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TOP 8
Image of WMLBK  tankless water heater
Instant Water Heater,6000W Tankless Electric Heater with Remote Control…
  • [AI inverter chip]Instantaneous water heater with AI-only chip, intelligent control…
  • [Installation Tips]This instantaneous water heater has a five-stage power adjustment…
  • [LCD Digital Touch Screen]Instant water heater is equipped with LCD screen, the temperature…
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TOP 9
Image of CO-Z  tankless water heater
CO-Z Gas Water Heater, 12L LPG Water Heater with Winter & Summer…
  • Ideal for Off-Grid Living: No electricity or natural gas required! This instant…
  • Enhanced Safety Features: This on-demand hot boiler comes with comprehensive safety…
  • Enhanced Safety Features: This on-demand hot boiler comes with comprehensive safety…
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TOP 10
Image of GASLAND BE158B tankless water heater
GASLAND BE158B 6L Gas Water Heater, Freestanding Tankless Hot Shower…
  • Specifications & Warranty - Water Heater is supplied from a standard 5-15kg LPG…
  • CE Certified - Complies with CE certified GAR standard throughout EU market.With…
  • CE Certified - Complies with CE certified GAR standard throughout EU market.With…
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