Best tankless water heater UK

Which is the best tankless water heater 2023?

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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 Lfhelper 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 2023. 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.

How to choose the right tankless water heater?

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.
…are you ready for the best picks of 2023?

Top 10 list of tankless water heaters in the UK (September 2023)

The bestseller list compares brands and their tankless water heaters. Which tankless water heater is the best?
Best choice TOP 1
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…
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Image of Haofy  tankless water heater
Mini Electric Water Heater, 3000W Tankless Instant Hot Water Heater…
  • 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…
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TOP 3
Image of AYYDS WP tankless water heater
Electric Instant Heater Faucet Tankless Hot Water Heater Tap, 360°Swivel…
  • Efficient and Energy SavingThe electric Instant water heater Tap consumes little…
  • Safe to UseOur electric water heater Tap have been rigorously tested to ensure your…
  • Easy to UseTemperature can be adjusted with the control switch handle, faucet with…
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TOP 4
Image of EUNEWR TP01144-WML tankless water heater
Mini Electric Water Heater, 3000W Instant Tankless Hot Water Heater…
  • 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…
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TOP 5
Image of CJHZQYY  tankless water heater
Instant Electric Water Heater, 3500W Intelligent Mini Instantaneous…
  • Water pressure switch + water flow switch: double start switch, easy to deal with…
  • Frequency conversion automatic constant temperature intelligent identification function,…
  • Adopting nickel-chromium wire technology, the thermal efficiency is higher than ordinary…
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TOP 6
Image of Ariston 3195216 tankless water heater
Ariston AURES Multi Electric Instantaneous Water Heater 9.5kW, Multi-Point,…
  • Highly Energy Efficient: The product offers a super efficient performance, lower…
  • Easy to Use: Aures Multi includes a user-friendly frontal dial and LED lights which…
  • Quick Comfort: The Aures Multi electric instantaneous water heater delivers hot water…
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TOP 8
Image of WMLBK P00421 tankless water heater
Mini Electric Water Heater, 3000W Instant Tankless Hot Water Heater…
  • Widely ApplicationsThis is a water heater for the application of changing the cold…
  • Easy To UseSimple operation, it is a high efficient water heater with compact size…
  • Safe and DurableThis instant water heater is made of high quality stainless steel…
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TOP 9
Image of WMLBK TAYY-17655 tankless water heater
Instant Water Heater, 3000W Tankless Electric Heating Element Energy…
  • [Wide Range of Applications] Standard international G 1/2" pipe connection in…
  • [Instant Hot Water] The water heater uses a 3KW heating system, the tankless electric…
  • [LCD Digital Touch Screen] The water heater has an LCD screen for a clear view of…
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TOP 10
Image of CAMPLUX AY132Max tankless water heater
Camplux AY132Max 5L Gas Water Heater with Portable Handle, Freestanding…
  • Easy Control - Simply turning the gas and water control knobs to get your desired…
  • All in One Bag - You can put the appliance in the provided waterproof bag and take…
  • Freestanding Design - Equipped with an independent stand, no worry about finding…
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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: 2023/09/22.