Best Boiler 5 L 2026

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Last Updated - 03.02.2026

Best Choice

01

Stiebel Eltron

Newest generation Stiebel Eltron boiler UFP 5 Trend with thermostop function, very compact, under-sink boiler 5 litres low pressure, with plug 230 V, 2 kW, made in Germany, 204966

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9.7

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Space-saving miracle: for more space under the kitchen sink
Safety: integrated anti-scald protection; 4-stage temperature limitation
Fitting + installation: low-pressure tap required – use of a pressure tap not allowed; only vertical under sink mounting; ready for plug: 230 V; easy wall mounting thanks to universal mounting strip; easy replacement of previous models
Energy-saving: the most compact of its kind with the lowest power consumption; the energy-saving thermostop function prevents unwanted heating of the fitting
Country approval: Germany, Austria, Poland
Comfort features: continuous temperature setting via high-quality rotary selector with tactile detent
Box contents: Stiebel Eltron small storage tank UFP 5 Trend, operating and installation instructions, wall hanging
Areas of use: pressureless boiler for the sink in the bathroom or the sink in the kitchen

99,40 €
02

Vaillant

Vaillant 10021140 Electric Hot Water Tank VEN 5/7-5 U plus

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9.5

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Scald protection can be activated.
No need to change the wall mounting rail.
Low pressure under-table wall storage.
Frost protection.
Adjustable thermostat from 7°C to 85°C.

86,09 €
03

AEG

AEG Boiler BOI 5 U, Under-Sink Boiler 5 Litres Low Pressure with Plug 230 V for Kitchen Sink and Wax Basin, 2 kW, Made in Germany, 204616

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9.4

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Safety and quality: child lock thanks to adjustable temperature limit/scald protection; tested safety by VDE testing institute, frost protection, made in Germany
Installation: easy installation, with plug (socket and cold water connection sufficient), under-sink mounting
Energy-saving functions: high quality thermal insulation, low standby consumption, energy efficiency class A
Comfortable operation: selectable desired temperature, infinitely adjustable from 35 to 85 °C
Box contents: a AEG small storage, operating and installation instructions (English language not guaranteed), wall hanging
Areas of use: open boiler 5 l under-sink for a water point in the kitchen and bathroom; Warning: use only with low pressure/pressureless tap – recognizable on the 3 connection hoses – hose shower fitting is only to be used with kink protection

69,90 €
04

AEG

AEG Boiler BOI 5 U, Under-Sink Boiler 5 Litres Low Pressure with Plug 230 V for Kitchen Sink and Wax Basin, 2 kW, Made in Germany, 204616

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9.3

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Safety and quality: child lock thanks to adjustable temperature limit/scald protection; tested safety by VDE testing institute, frost protection, made in Germany
Installation: easy installation, with plug (socket and cold water connection sufficient), under-sink mounting
Energy-saving functions: high quality thermal insulation, low standby consumption, energy efficiency class A
Comfortable operation: selectable desired temperature, infinitely adjustable from 35 to 85 °C
Box contents: a AEG small storage, operating and installation instructions (English language not guaranteed), wall hanging
Areas of use: open boiler 5 l under-sink for a water point in the kitchen and bathroom; Warning: use only with low pressure/pressureless tap – recognizable on the 3 connection hoses – hose shower fitting is only to be used with kink protection

53,99 €
Value for Money

05

AEG

AEG Electric Water Heaters with Small Storage Tank, white, 222162

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34% Off
9.2

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Safe: tested safety by VDE testing institute, frost protection position
Please note: use only with low pressure/pressureless fittings, recognizable on the 3 connection hoses, do not use a hose shower fitting
Made in Germany
High hot water comfort for a water point: immediately hot water in the kitchen and bathroom
Economical and efficient: high-quality thermal insulation, low standby consumption, energy saving setting, energy efficiency class A
Easy temperature selection: stepless from 35-85°C, temperature selection limitation possible to 45/55/65°C
Easy installation: ready to plug, under-sink mounting

74,99 € 114,24 €(34% Off off)
06

Bosch Thermotechnik

Bosch Tronic Store Compact electric storage tank for 5 litres under-sink storage unpressurised to supply a tap point.

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12% Off
9.0

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

The clever choice when only one tapping point is to be supplied. The compact storage that simply plugs into the power outlet - simple and efficient.
Safe and reliable: With child protection against scalding - tested safety by VDE testing institute.
Product data: 2.67 kg, 390 x 258 x 220 mm, 220-240 volts, Installation method: Suspended under table Colour: white.
Predecessor: DO3670D4M, DO3670D4M, DO5UF701
Open ready to plug under sink device with 5 L usable capacity for kitchen or washbasin, with frost protection against freezing water.
High-performance under-sink storage with reduced standby consumption thanks to high-quality compact thermal insulation - noticeably reduces power consumption - Energy efficiency class A
Device must be installed without pressure. For pressure-free installation, a standard low-pressure fitting must be used.

65,69 € 74,99 €(12% Off off)
07

Stiebel Eltron

Newest generation Stiebel Eltron boiler UFP 5 Trend with thermostop function, very compact, under-sink boiler 5 litres low pressure, with plug 230 V, 2 kW, made in Germany, 204966

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8.8

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Show more
Main highlights

Space-saving miracle: for more space under the kitchen sink
Safety: integrated anti-scald protection; 4-stage temperature limitation
Fitting + installation: low-pressure tap required – use of a pressure tap not allowed; only vertical under sink mounting; ready for plug: 230 V; easy wall mounting thanks to universal mounting strip; easy replacement of previous models
Energy-saving: the most compact of its kind with the lowest power consumption; the energy-saving thermostop function prevents unwanted heating of the fitting
Country approval: Germany, Austria, Poland
Comfort features: continuous temperature setting via high-quality rotary selector with tactile detent
Box contents: Stiebel Eltron small storage tank UFP 5 Trend, operating and installation instructions, wall hanging
Areas of use: pressureless boiler for the sink in the bathroom or the sink in the kitchen

85,94 €
08

Vaillant

Vaillant 10021140 Electric Hot Water Tank VEN 5/7-5 U plus

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8.6

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Show more
Main highlights

Scald protection can be activated.
No need to change the wall mounting rail.
Low pressure under-table wall storage.
Frost protection.
Adjustable thermostat from 7°C to 85°C.

82,50 €
09

Thermoflow

Thermoflow top/under-sink storage

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8.4

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Mounting: the hot water boiler with G 3/8 inch connection can be mounted on a wall. With a dimensions of 42 (H) x 27 (W) x 18 (D) cm, the 5 litre small storage tank can be mounted
Hot water storage: the ready-to-plug electric hot water tank, with automatic frost protection, has a storage volume of 5 litres and can be mounted as a hot water under sink device
Energy-saving: thanks to the energy-saving mode and energy efficiency class A, the Thermoflow UT5 under-sink boiler allows efficient water heating with an annual power consumption of 490 kWh
Box contents: the Thermoflow UT5 low pressure boiler comes ready for plug, including instruction manual (English language not guaranteed). A low-pressure fitting is mandatory for commissioning the small reservoir
Areas of use: with a heating time of 10 minutes. From 10 °C to 65 °C, the 5 litre under-sink unit ensures pleasantly tempered water and is suitable as a boiler in the kitchen or bathroom

47,08 €
10

MccoMMon

Boiler, boiler 5 l, under-sink, hot water boiler 5 l, hot water boiler, hot water tank, under-sink boiler, water boiler

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8.2

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

【Adjustable Temperature】: With a temperature controller, the temperature in the inner container can be easily adjusted (86-149℉) to meet daily hygiene requirements such as brushing teeth, dishwashing/vegetables/fruit/clothes/face/hands washing, which increases the usability of the water heater.
Safe and versatile: This pressure-resistant compact storage tank has a safety valve with reliable safety functions. It is not only suitable as an under-sink water heater for kitchens, but also for guest bathrooms or workshops - anywhere a quick and reliable hot water supply is required.
Fast heating, high efficiency: With a rated power of 1500 watts, this water heater quickly and energy efficiently heats 6 litres of water to the desired temperature, making it ideal for preparing hot drinks or rinsing with warm water.
Durable quality: the interior of the hot water tank is made of high-quality 304 stainless steel, which is corrosion resistant and ensures a long service life. Its robust ABS outer shell makes it an indestructible companion for your household.
Compact and space-saving: With its compact dimensions of 21.5 x 32.5 x 23.5 cm, this under-sink water heater is the perfect solution for the hot water needs of your kitchen. It installs effortlessly under any sink or sink and provides instant convenience without compromising valuable storage space.
Compact and space-saving: This under-sink water heater has compact dimensions of 21.5 x 32.5 x 23.5 cm, making it the perfect solution for the hot water needs in your kitchen. It installs effortlessly under any sink or sink and provides instant convenience without compromising valuable storage space.

54,99 €