10 Best Inline Water Heaters in 2023 [Easy to operate]


Inline water heaters are a type of water heater that is installed in line with your home’s main water supply. This means that the hot water from the heater is delivered directly to your fixtures, without the need for a storage tank. Inline water heaters are a great option for homeowners who want instant hot water and don’t have the space for a traditional storage tank heater.

Best Overall
1
4.9
Stiebel Eltron Mini Tankless Water Heater

Stiebel Eltron Mini Tankless Water Heater

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Best Runner-Up
2
4.8
Thermomate UT10 Electric Water Heater

Thermomate UT10 Electric Water Heater

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  • 【10L CAPACITY】- 10L point-of-use storage water heater fits perfectly under your sink or basin to provide hot water right where you need it. With 2 kW Output, it heats water up quickly. Its fast recovery rate eliminates long wait for hot water at your sink. Stainless steel water storage tank and heating element are designed for efficiency, durability and easy replacement.
  • 【PROTECTION OF FAMILY SAFETY】- Thermomate 10L water heater was approved by CE to ensure your family safety, extremely following compliance with EU legislation. Adopted Thermal Cut-off Technology, it will stop heating automatically when the temperature reaches to 95℃ or there is no water in the water tank, which prevents the electric water heater from overheating, thus prolonging its spanlife.
  • 【SAVING ENERGY AND BUDGET】 - The UT10 under sink water heater employs high density EPS foaming technology, minimizing radiant heat loss. Short distance hot water supply reduces the stand-by loss consumption, therefore reducing your energy bills and budget.
  • 【5 MODE OPTIONAL FOR EASY USE】- The water heater features 5 modes for your option, with selectable temperature ranges form 7℃ to 75℃. Its frost protection mode ensures it being fully functional in cold days. It is free to connect to a mixer tap, which provides flexible temperature flow for you.
  • 【FLEXIBILITY IN INSTALLATION】- No expansion vessel is needed, and no need for special tap makes it easily to be installed under your sink where you need hot water. The storage water heater has a sleek and attractive exterior design, blending in seamlessly with existing décor when installed in a visible location, making it a great option in basement wet bar, patio kitchen station, garage, attic, or even in an RV or on a boat.
Best Eco Display
3
4.7
Ariston Electric Water Heater

Ariston Electric Water Heater

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  • Water heater designed and manufactured to be installed in UK.
  • First in Class ErP rating “A” across all models: With its electronic temperature control and its Eco Evo Function, the Andris Lux Eco is an energy efficient electric water heater boasting an “A” ErP energy rating across the whole range.
  • “Eco Evo” function: Thanks to the ECO EVO function, Andris Lux Eco remembers when and how much hot water you use. In this way the function will not only provide hot water efficiently, buti t will also and above all saving up to 15% on your energy bill.
  • Anti-legionella function for total peace of mind: Once a month, this mini-tank electric water heater automatically increases the water temperature up to 65°C, in order to eliminate the risk of legionella bacteria developing. Ideal for applications such as hospitals, schools and care homes.
  • Eco Display: The unit’s smart, user-friendly display is easy to use and provides precise electronic temperature control, allowing the user to set the desired temperature for every need. The button “ECO” indicates when the Eco Evo Mode is activated and the LED indicator provides a visual guide to the water temperature inside the tank. In yhis way, you can have the hot water you need, when you need it, without any effort.
Best For Easy Use
4
4.6
Stiebel Eltron Water Heater

Stiebel Eltron Water Heater

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  • Fully electronic compact instantaneous water heater with 4i technology
  • Maximum energy efficiency and accurate temperature delivery at all times thanks to fully electronic closed-loop control
  • Easy operation via a large, backlit multifunction display
  • Particularly energy efficient in ECO mode
  • High grade design
Maximum Comfort
5
4.5
Ariston ANDRIS R 10 L Undersink Electric Water Heater

Ariston ANDRIS R 10 L Undersink Electric Water Heater

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  • Water heater designed and manufactured to be installed in UK
  • €œB” class ErP rating
  • Economy' setting on the dial to optimise comfort and energy saving
  • Titanium enamelled tank for durability: This premium quality water heater the best tank protection with the properties of titanium, wich constitutes a perfect shield against corrosion. Every single component is developed to ensure longlasting high performance with the guarantee of Ariston Brand
  • Maximum Comfort: Andris series products are able to keep the water hot for a long time thanks to the thick high-density polyurethane insulation placed in the tank and the outside of the water heater. It provides an effective barrier against heat losses, optimizing both the performance of the product and the users†comfort. The models of the Andris series are equipped with an immersion thermostat, which allows a very precise adjustment of the water temperature, heating it to the desired point
Easy to install
6
4.4
ATC Under Sink Water Heaters

ATC Under Sink Water Heaters

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Immediate heating
7
4.3
Mini Electric Water Heater

Mini Electric Water Heater

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  • 【Immediate heating】 it is not necessary to save water, just heat it after 3 seconds. Tankless water heaters provide a continuous flow of hot water, heating only the required water. One-button operation, easy to transport
  • 【Immediate heating】 it is not necessary to save water, just heat it after 3 seconds. Tankless water heaters provide a continuous flow of hot water, heating only the required water. One-button operation, easy to transport
  • 【Large LCD screen】 The Thermoflow water heater without a water tank is equipped with a backlit LCD screen and a touch screen, which can easily carry hot water at commercial temperatures of 86 ° F (30 ° C) to 131 ° F (55 ° C) For commercial applications.
  • 【Ensure safety】 Built-in leakage protection device. It turns off automatically due to overheating, it turns off automatically when it does not work
  • 【Constant temperature】 This electric temperature control device guarantees a constant output temperature even if the flow rate changes from top to bottom. It can be installed in the kitchen, living room, bathroom or any other desired place
Best suitable for big families
8
4.2
220V 6500W Tankless Instant Water Heater

220V 6500W Tankless Instant Water Heater

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  • ​Instant heating, no more waiting for hot water, especially suitable for big families
  • High precise thermostat ensures a constant temperature
  • Low water pressure to start, users of higher floors can enjoy pleasant experience of shower
  • Large LED screen shows temperature clearly, touch button for easy operation
  • Safe and long lifespan, automatic power-off when water is off and over-temperature protection
Safer to use
9
4.1
Mini Instant Water Heater

Mini Instant Water Heater

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  • 【Timely Hot Water Supply】: 3000W power heating system can quickly get hot water without preheating. The highest temperature reaches 55°C/131°F. It is hot as soon as it is opened, and hot water is supplied 24 hours a day, responding to your water demand at any time, bringing you a perfect experience of comfort and relaxation.
  • 【Easy to operate】: The temperature can be adjusted by remote control and touch. Equipped with digital display and touch control panel, LED screen displays the current temperature in real time. The temperature can also be adjusted through the remote control. The operation is very simple and very convenient.
  • 【360° Free Installation】: The body of the hot water heater is small and does not take up space. It can be installed upside down, lying down, hanging upright, and tilted. It can be used for the installation of wash cabinets in the bathroom, under the sink, beside the washing machine, etc., to meet different needs.
  • 【Safer to use】: Instant electric hot water heater have a variety of safety protection functions, water and electricity isolation, IPX4 waterproof, leakage protection, dry heating protection, over-temperature and inactive state automatic power-off. Use water safely and securely.
Cheapest Option
10
4
hygger 300W 500 Watt Aquarium Heater

hygger 300W 500 Watt Aquarium Heater

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  • For aquariums from 110 to 220 liters: This aquarium heater provides a warm and comfortable home for your fish. It's 300 watt output power is very suitable for 110-220 liter aquarium, the temperature range is 16 to 32 ℃
  • Automatic temperature maintenance function: When the water temperature reaches the set value, the heater will automatically turn off. When the temperature drops to 1 ℃ below this value, it will automatically turn on again. The temperature is set on the control unit and saved using the reminder function
  • Digital LED display: The IC temperature controller displays the water temperature or preset temperature, and the two indicators show the status of the heating element. The temperature is controlled outside of water (temperature range: 16 to 32 ° C with an accuracy of -1 ° C. A thermometer separate from the heating element operates within a temperature range of 0 ° C to 99 ° C). Setup is very simple and convenient
  • Alarm function when the temperature is too high: When the water temperature reaches 36 ℃, the display screen flashes and the heater's energy supply is automatically interrupted. Once the water temperature returns to the set temperature, the heater will automatically return to the standard function. In this way, you can avoid fish injuries and injuries due to technical failures
  • High Quality and Guarantee: Aquarium heating elements are composed of high quality quartz glass and polycarbonate, and are double sealed. Explosion-proof, shatter-proof, waterproof grade reaches IP68. Voltage 220-240 V, heating rod length 26.5 cm. The heating element cable is 2.5 m long, the control unit cable is 1.5 m, and the thermometer cable is 1.8 m. We provide a one-year warranty for this product. If you have any questions, please contact the retailer who purchased the product.


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