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 Haofy 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 (February 2021)

The top 10 list shows how brands and their tankless water heaters compare. Which tankless water heater is the best?
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Top choice* TOP 1
Image of Haofy  tankless water heater
Instant Water Heater, Mini Electric Water Heater, 3000W Tankless Water Heater with LCD Display, Portable Water Heater, Instant Hot for Kitchen or Bathroom (Black)*
  • 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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Value deal* TOP 2
Image of Valens  tankless water heater
Valens LPG Hot Water Heater, 18L LPG Water Heater, 36kw Stainless Steel Automatic Ignition Liquefied Petroleum Gas Water Heater, Tankless Instant Boiler with LCD Display*
  • ATTENTION--This propane water heater must be used in ventilated conditions to ensure…
  • Easy to use--There are altogether 3 knobs for gas control, temperature control and…
  • SAFE--Our hot water heater is CE certified and offers manifold protection such as…
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TOP 3
Image of Z ZELUS  tankless water heater
Z ZELUS 18L LPG Hot Water Heater 36KW Stainless Steel Liquefied Petroleum Propane Water Heater Instant On-Demand Boiler LED Display Tankless Gas Water Heater for Kitchen Bathroom Home (18L)*
  • Application and AttentionThe portable hot water heater suit for the household, offering…
  • Low Water-Pressure StartupThe water control linkage valve makes the heater start…
  • High Efficient Energy SavingCompact and light weight structure with 11.5% energy…
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TOP 4
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 5
Image of HEEPDD HEEPDDpsbi4oduzm-01 tankless water heater
Mini Water Heater, 5500W Electric Instant Water Heater Tankless Shower Hot Water System for Bathroom Kitchen Washing 220V(Red)*
  • Satisfaction Guarantee---We greatly value our customers and want you to be completely…
  • Easy to Operate---LCD Digital Temperature Display. Intelligent touch button, temperature…
  • Easy Installation---This product is a high-power appliance that requires≥2.5mm2…
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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 BuoQua  tankless water heater
BuoQua 12L Propane Hot Water Heater 3.2GPM 24KW Tankless Instant Boiler Stainless Steel Liquefied Gas Water Heater with Shower Head Kit Wall-Mounted Water Heater (12L-LPG)*
  • The heater exchanger and main burner adopt mostly advanced energy-saving and combustion…
  • Automatically decrease pressure under excessive high water pressure. The anti-freezing…
  • Both cold water and warm water can be properly controlled. Over 75 °C will automatically…
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TOP 8
Image of TopSer SDR-18DC-3H tankless water heater
Electric Water Taps,TopSer Pro 220V Tankless Electric Heater Kitchen Taps,360 Degree Rotate Cold and Hot Water Tap with Lcd Display for Kitchen,Bathroom,Washroom [British Standard Plug]*
  • 5.TASTE THE ART OF LIVING: Four Seasons General, unlimited hot water, warm your hands,…
  • 4.Over-temperature Protection, Dry automatic power-off design, One-button reset button…
  • 3.Food grade stainless steel heating element, lead free, scale reduction, to ensure…
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TOP 9
Image of Fdit Fdit8bdaiv46tg-02 tankless water heater
Instant Electric Water Heater 5.5KW Tankless Digital Power Shower for Bathroom Kitchen Beauty Hair Solan (Red)*
  • Save energy: save water by eliminating the wait for hot water to reach the tap, reducing…
  • Constant temperature: this electrical temperature control ensures a constant outlet…
  • Ensure safety: built-in leak protection device. Switch off automatically without…
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TOP 10
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…
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* Affiliate link. We participate in the Amazon Associates Program. As an Amazon Associate we earn from qualifying purchases. There are no additional costs for you. For the top 10 list 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 2021/02/28 15:51 o'clock.