Best Under-Sink Water Heaters

The Thermex Buono 10 U storage water heater stands out with its modern design in dark colors and a color display with touch control. The streamlined rectangular body can easily become an element of the kitchen or bathroom interior in the case of hidden communications. Compact dimensions (34x34x29 cm) and the upper location of the pipes allow for easy installation in cabinets and niches. The boiler holds 10 liters, which is enough for taking a shower, cleaning the apartment or washing dishes. An electric heating element with a power of 1500 W will allow you to quickly heat the entire specified volume to the maximum temperature.

The built-in electronic control unit offers a good set of functions for home use. The main feature is the Smart mode, in which the system automatically maintains the optimal heating temperature. The maximum indicator reaches 75 ⁰C, which helps to destroy bacteria, including Legionella. The internal coating of the glass ceramic tank is highly resistant to corrosion and hygienic. Safety measures include protection against excess pressure, overheating and freezing, allowing you to use the boiler in unheated rooms. At the same time, Thermex Buono 10 U can be purchased at a very affordable price.

The body of the ten-liter Hotpoint-Ariston ANDRIS R 10 U boiler has a square profile (360x360 mm) and a thickness of 298 mm. Since the device is designed for installation under a kitchen sink or a bathroom sink, the pipes for connecting the heater to the water supply and tap are located on top. Installing the boiler upside down is not allowed (for installation on top the sink in the same series there are water heaters for 10, 15 and 30 liters of water with lower pipes).

Although this boiler is considered economical, its power is relatively small (1200 W), so you can’t count on super-fast water heating. The temperature of the liquid entering the tank from the water supply rises by 45 °C in 29 minutes. The desired heating temperature is set using a rotary mechanical regulator, which is located in the center of the front panel. The most advantageous in terms of energy consumption is the middle position of the regulator (marked with the letter E - “economy mode”). And the heating mode to the maximum temperature ( 80 °C) is not intended for everyday use, but for episodic use as a means of combating legionella - a bacterium that lives in warm water, but does not survive in hot water. The tank is “wrapped” in polyurethane foam - an effective insulating material that retains the heat of heated water. Therefore, judging by customer reviews, Ariston water heaters, including this model, cool down slowly and maintain the temperature for a long time. A copper heating element is used as a heating element. The magnesium anode is responsible for active protection against corrosion. And the finely dispersed enamel applied to the inner surface of the tank acts as a passive protective agent that prevents water from coming into contact with steel.

Due to its low power, the Hotpoint-Ariston ANDRIS R 10 U boiler does not create a significant load on the electrical network. Therefore, it is perfect for installation in old houses with weak wiring, initially not designed to service powerful household appliances. The device comes with a bracket for mounting the water heater on the wall, a safety valve and a meter-long power cable - all the parts and accessories necessary for the master to immediately install, connect and start the boiler.

Bosch Tronic 2000 T minitank is a small storage water heater with a capacity of 15 liters. This volume is enough for about 10 - 20 minutes of hot water use (depending on the flow pressure and the position of the thermostat). A "wet" heating element with a power of 1500 W is used to heat the water. With its help, the boiler can increase the water temperature from 15 to 65 degrees in 35 minutes.

The boiler is controlled by mechanical regulators located on the front panel. One of them replaces the "On/Off" button (that is, the water heater can be completely switched off without pulling the plug out of the socket). Using the second "knob", the customer can set the desired water heating temperature (up to a maximum of 70 °C). It should be noted that this boiler (as well as many other small water heaters) does not have a thermometer, and the regulator is not particularly accurate. Therefore, it is better to set the desired water temperature once "by trial and error", and then touch the "knob" as little as possible. One of the positions of the thermostat (it is indicated by a risk at the bottom of the conventional temperature scale) serves to activate the anti-freeze function. In this mode, the boiler will turn on only when the water inside it cools down to 5 °C, in order to prevent freezing of the liquid in the tank and pipes. Therefore, the Bosch Tronic 2000 T minitank, in addition to normal household use, is also well suited for use in summer kitchens, workshops, production facilities, warehouses and other premises where there is a water supply and electrical network, but heating is difficult.

This boiler has excellent corrosion protection. The inner surface of the tank is covered with a glass-ceramic coating. It not only prevents direct contact of steel with water, but also has good hygienic properties (at least compared to more traditional enamel). Active corrosion protection is provided by a magnesium anode. Bosch is so confident in the effectiveness of this combination of protective systems and coatings that it provides a 5-year warranty on the Bosch Tronic 2000 T minitank boiler tank.

The ten-liter electric water heater Gorenje GT 10 U is designed to serve one point of water intake - a tap in the kitchen or bathroom. Thanks to the decent power of the heating element (2000 W) and the small volume of the tank, it prepares hot water very quickly. Tap water with a temperature of 10 °C, entering the boiler, heats up to 65 °C in 20 minutes, and to the maximum possible 75 °C - in 22 minutes.

The design of the boiler is very limited and laconic. Its body has an almost perfect rectangular shape with slightly beveled corners. But it should be noted that the device is quite large (500x350x265 mm) by the standards of this class of water heaters, so you need to make sure that there is enough space under the sink siphon or next to it to install the boiler. In many photos, the Gorenje GT 10 U body looks light gray and matte, but in fact, its surface is white with a glossy effect. On the front panel there is only the manufacturer's logo, an LED that lights up when the water is heating, and a round thermostat. Using the rotating handle, you can set the desired water heating temperature within the range from 25 ° C to 75 ° C. The manufacturer recommends choosing an intermediate value (marked with the letter E), corresponding to a temperature of 55 ° C. The operating instructions for the water heater claim that in this mode, energy consumption, heat loss and the rate of plaque formation on the heating element are reduced. The position of the regulator, indicated by a pictogram with either an asterisk or a snowflake, serves to switch the boiler to anti-freeze mode, in which the heater will automatically maintain the water temperature in the tank at approximately 9 °C.

Gorenje GT 10 U is considered an economical electric boiler, as it belongs to class A in energy efficiency. Thanks to the thick layer of polyurethane foam (up to 30 mm thick in some areas) between the tank and the body, the device retains heat well and, therefore, is turned on less often to heat water. In addition to efficiency, good protection against corrosion should be noted. This is due to the enamel coating on the inner walls of the storage tank and the magnesium anode inside it. The manufacturer provides a 5-year warranty on the tanks of boilers of this family.

The letters US in the name of the electric boiler Atlantic Nanto 15 US mean Under Sink, and the number 15 corresponds to its volume in liters. The model marking immediately makes it clear that this water heater has pipes on top (so that it is convenient to install it in a cabinet under a washbasin or sink), and the supply of heated water is enough to wash dishes or take a quick shower.

The power of the device is 2000 W. A copper heating element is used as a heating element. It heats water at a temperature of 10 °C to 45 °C in 18 minutes, and to 60 °C in 27 minutes. The regulator on the front panel allows you to set the desired heating level. The manufacturer recommends turning the handle to the ECO mode, corresponding to a temperature of 50 - 55 °C, since it is considered the most economical (in terms of annual electricity consumption). The suitcase icon to the left of the regulator corresponds to the freeze protection mode, in which the boiler maintains the water temperature at 7 °C. The drop-shaped indicator changes color. It glows red when the heating element is on, and lights up blue if the water temperature has reached the value set by the regulator.

The body of the device has an almost cubic shape (387x360x321 mm). Inside, it is filled with polyurethane foam - an effective heat-insulating material, thanks to which the Atlantic Nanto 15 US boiler corresponds to class B in energy efficiency. The tank is coated with enamel on the inside. Anti-corrosion protection is provided by a magnesium anode and O'Pro technology - a resistor for balancing the difference in electrical potentials between the body and the heating element. The manufacturer assures that this technology slows down the processes of electrochemical corrosion and increases the reliability of boilers. The tank of the Atlantic Nanto 15 US water heater is provided with a 5-year warranty.