TOP-5 boilers for installation under the sink

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

Although this boiler is considered economical, its power is relatively small (1200 W), so you can’t count on ultra-fast heating of water. 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 power consumption is the middle position of the regulator (indicated by the letter E - "economy mode"). And the heating mode to the maximum temperature ( 80 ° C) is not intended for everyday use, but for occasional use as a means of combating legionella - a bacterium that is found 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 user reviews, Ariston water heaters, including this model, cool down slowly and keep the temperature for a long time. A copper heating element is used as a heating element. The magnesium anode is responsible for active corrosion protection. And the finely dispersed enamel applied to the inner surface of the tank acts as a passive protective agent that prevents water from contacting 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 great for installation in old houses with weak wiring, not originally 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 power cable - all the parts and accessories necessary for the master to immediately install, connect and start the boiler.

In some photos, the Zanussi ZWH / S 10 Mini U boiler looks flat, but in fact it has the shape of an almost regular cube (324x324x315 mm). Inside the case there is a heat-insulated steel container containing 10 liters of water. This volume is quite enough to wash the dishes without much haste after dinner for a family consisting of 2 - 3 people (by the way, in the same line there is also a 15 l model that is almost similar in characteristics). You can even take a quick shower if you turn off the water while lathering. The main advantage of this boiler is the rapid heating of water. Thanks to the power of 2000 W and the small volume of the tank, it takes only 19 minutes to heat water from 25 ° C to 75 ° C.

To control the temperature, a mechanical regulator in the form of a "twist" is used. In addition to the OFF position, at which the boiler turns off, it has three operating positions: LOW (heating tap water up to 30 ° C), ECO (“economical” mode that maintains the temperature in the tank at 50 - 55 ° C) and HIGH (heating up to the maximum possible 75 °C). In addition to the shutdown function, standard for all electric boilers, when heated to the maximum temperature, the device has a protection system against turning on without water in the tank. The durability of the tank is ensured by a magnesium anode, which “pulls out” corrosion processes, and an enamel coating on the inner walls of the tank. The manufacturer gives a 5-year warranty for the tank and 2 years for the electrical part. The estimated service life of the Zanussi ZWH / S 10 Mini U boiler, according to the data from the operating instructions, is 8 years.

The body of the appliance is made of white plastic, but on the front there are colored details that give the boiler design originality and distinguish it from other water heaters. On sale there are devices with inserts of bright yellow and pale green. Some sellers indicate their color in the product description, while others miss this point. Therefore, before you buy a Zanussi ZWH / S 10 Mini U boiler, you should check in the online store what color the inserts on the body of your water heater will be.

Many electric boilers look boring and unpresentable, but this cannot be said about the Electrolux EWH 15 Q-bic U. By the standards of water heaters, it is considered a very stylish device - one can feel the influence of the traditions of Scandinavian design, characteristic of all Electrolux appliances. Even his body is not painted in the standard white color, but has a shade of ivory. Therefore, this boiler is an excellent choice if you plan not to hide it in a cabinet under the washbasin, but to install it in an open place.

In addition to the remarkable design, other characteristics deserve attention. First of all, it should be noted the high power of the heating element - as much as 2500 watts. Thanks to him, the device quickly prepares hot water, it heats up to 75 ° C in just 23 minutes. The degree of heating of the water in the tank can be adjusted using the rotary control. The lowest possible temperature (30 ° C) is indicated by the word LOW, the economy mode (50 - 55 degrees) is indicated by the word ECO, and opposite the position of the knob corresponding to the maximum heating temperature of 75 ° C, HIGH is written.

Inside the square case, which has external dimensions of 360x360x315 mm, there is a 15-liter steel container. It is separated from the environment by a layer of polyurethane foam, an effective heat-insulating material. The walls of the casing and the steel heating element are coated with finely dispersed enamel, which protects the metal from corrosion, preventing its direct contact with water. Magnesium anode provides electrochemical protection. Enamel, anode and good quality of other parts allow the manufacturer to give a large warranty on the tank of the Electrolux EWH 15 Q-bic U boiler - 5 years from the date of sale. The estimated service life of this water heater is at least 8 years (at least, the instruction manual says so). Thus, if the condition of the wiring allows the use of 2500 W household appliances, then the 15-liter Q-bic from Electrolux will be a good choice for a hot water appliance that can work for many years in the kitchen or in the bathroom.

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 using hot water (depending on the flow pressure and the position of the thermostat). For heating water, a “wet” heating element with a power of 1500 W is used. With it, the boiler can raise the water temperature from 15 to 65 degrees in 35 minutes.

To control the operation of the boiler, mechanical regulators are used, which are located on the front panel. One of them replaces the On/Off button. (i.e., the water heater can be turned off completely without pulling the plug out of the socket). Using the second “twist”, the user can set the desired water heating temperature (up to a maximum of 70 ° C). It should be noted that this boiler (as, indeed, 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 using the “poke method”, and then touch the “twist” as little as possible. One of the positions of the thermostat (it is indicated by a risk in the lower part of the conditional temperature scale) serves to activate the antifreeze function. In this mode, the boiler will turn on only when the water inside it cools down to 5 °C to prevent freezing of the liquid in the tank and pipes. Therefore, the Bosch Tronic 2000 T minitank, in addition to ordinary domestic use, is also well suited for use in summer kitchens, workshops, production workshops, warehouses and other premises where there is water supply and an electrical network, but heating is tight.

This boiler has excellent corrosion protection. A glass-ceramic coating is applied to the inner surface of the tank. It not only prevents direct contact of steel with water, but also has good hygienic properties (at least compared to more traditional enamel). Magnesium anode provides active protection against corrosion. Bosch is so confident in the effectiveness of this combination of protective systems and coatings that they offer 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 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 modest and concise. Its body has an almost regular 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 for mounting the boiler. In many photos, the case of the Gorenje GT 10 U looks light gray and matte, but in fact its surface has a white color with a glossy effect. On the front panel there are only the manufacturer's logo, an LED that lights up when the water is heated, and a round thermostat. By means of the rotary knob it is possible to set the required water heating temperature within the range from 25 °C to 75 °C. The manufacturer recommends choosing an intermediate value (indicated by the letter E), corresponding to a temperature of 55 ° C. The instruction manual for the water heater claims that in this mode, power consumption, heat loss and the rate of plaque formation on the heating element are reduced. The position of the regulator, indicated by an icon with either an asterisk or a snowflake, is used to switch the boiler to the anti-freeze mode, in which the heater will automatically maintain the temperature of the water in the tank at about 9 °C.

Gorenje GT 10 U is considered an economical electric water heater as it belongs to class A in terms of energy efficiency. Thanks to a 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, turns on less often to heat water. In addition to economy, it should be noted good protection against corrosion. The enamel coating on the inner walls of the storage tank and the magnesium anode inside it are responsible for this. The manufacturer gives a 5-year warranty for the tanks of this family of boilers.