Column for heating water: choose a flowing gas water heater. Which geyser is better: reviews of experts and customers

Lack of hot water supply is not a problem - everything is solved by installation good water heater. Gas options have proven themselves well. However, it is very easy to get confused in the modern assortment, therefore, even before going to the store, you need to figure out in advance which geyser better, and get expert opinions on specific products.

There are many manufacturers of such units - among them there are many worthy and reliable options. It is important to focus on the following indicators:

equipment power;
ignition type;
burner type;
safety.

The power characteristic affects its overall performance. In fact, it determines the amount of water that the device can handle in a certain period of time. Power can be low (from 17 to 19 kW), medium (22-24 kW), high (from 28 to 31 kW). When choosing power, it is necessary to focus on the estimated number of water intake points in the dwelling. If there are several of them (and their simultaneous operation is assumed), then it is better to stop at a unit with medium and high power.

The type of ignition is also relevant. Previously, a lighter and matches were used for this. Modern models suggest semi-automatic or even completely improved automatic system. In automatic machines, a turbine or a battery will provide a spark, and to start it is enough just to open the tap with hot water. There is also a piezo ignition (semi-automatic option), which involves pressing a button intended for this. The bad thing here is that this method increases fuel consumption (the wick will burn even after the ignition is completed).

It is worth paying attention to the type of burner. You should not take one that has a constant power - you will have to regulate it, adjusting it to the pressure of water in the system. The best idea of the developers - if the power is modulating. Such an element is independently able to adjust to the jet, then the temperature will be relevant.

Finally, in the matter of reliability of work, it is worth paying attention to safety. Modern models of geysers are equipped with three levels of protection, which manifests itself in various incidents - an accidental cessation of the flame, the sudden appearance reverse thrust. Special hydraulic valves are also provided to help avoid overheating.

It is also important how combustion products will be removed - this can be done using a turbocharged method and using a chimney. In the first case, everything will go immediately to the street, and in the second - to the chimney system.

Analysis of popular gas water heaters

Experts in the field of such equipment have already compiled a rating of gas water heaters. The opinion of experts formed the basis of the review, which presents the top 5 best trademarks specializing in their manufacture.

1 seat for Bosch WR 10-2P

The undoubted leader of the review is the Bosch WR 10-2P model. It attracted ordinary users stylish design and compact size. The unit will harmoniously fit even in small room. Experts unanimously recognize it mostreliable: The automatic ignition system is used. The device itself is activated when the hot water tap is opened. The limitation on the heating temperature is also thought out. Ignition is carried out using a piezo - batteries will not be needed.

Column Bosch WR 10-2P

With such a technique, you should not worry about pressure - it will work even if it does not differ in stable pressure. By the way, you can regulate the flame and the temperature of the liquid using special regulators.

However, such “perfection” also has small drawbacks.

The performance of the model is approximately 10 liters per minute. This is considered not the best indicator.
Water quality affects its performance.
To clean the device, it must be completely disassembled.
Service maintenance is expensive, and not every city has an authorized Bosch dealership. In addition, you must immediately prepare for high cost of original spare parts.

2nd place for Ariston Fast Evo 11C

Ariston Fast Evo 11C is on a par with a competitor from Bosch: it is also able to work even at a nominal water pressure of 0.1 bar. It also has a well-thought-out security system: flame control, a thermostat that protects against overheating and a draft sensor. You can set the maximum temperature (limit 65°C).

One of the main advantages is mains operation, what better option with batteries that can run out at any time. The heating power of 19 kW will provide a productivity of 11 liters per minute of working time.

Column Ariston Fast Evo 11C

There is also a minus that did not allow this device to take a leading place in the top - the temperature on its digital display displayed incorrectly.

The best inexpensive offer in 3rd place from Neva Lux 5514

This, no doubt, can be called the Neva Lux 5514 option - this option may well compete in build quality with expensive foreign offers. Of course, the functionality here is not as chic as that of well-known brands, but in general, the model is impressive:

auto ignition;
intuitive control;
independence from water pressure (can be adjusted using hydraulic adjustment);
the case does not heat up during operation;
can work with two points of water intake(there will be no temperature fluctuations);
there is a gas control;
the combustion chamber is cooled by a water system.

Users are delighted with another point - the initial settings are valid for several years. Everything will work efficiently and will not go astray.

Column Neva Lux 5514

The following disadvantages prevent the rise of positions in the top:

noticeable noise during operation;
battery replacement;
expensive in case of heat exchanger.

Advantages and disadvantages of Mora Vega 10 in 4th place

The Czech manufacturer from Mora Top Vega 10 has a capacity of less than 10 liters, but he won fourth place in the top of the best geysers due to another number of advantages:

European build quality (manufacturers promise that there is not a single detail from China in the design);
copper heat exchanger (increases efficiency up to 92.5%);
scale-free technology in pipes;
a full range of security systems (does not start without turning on the water, protection against overheating, against the appearance of reverse thrust, the presence of fuses for the functioning of the burners).

Column Mora Vega 10

Unlike competitors, Mora Top has a more tangible weight - at least 2.5 kg. However, there is a drawback: with a weak water pressure, the device may simply not turn on (the manufacturer has calculated at least 0.2 bar).

5th place for Zanussi GWH 10 Fonte

An excellent geyser Zanussi GWH 10 Fonte will quickly and efficiently heat water in a cottage or apartment. The unit will look good in any interior, it makes little noise and consumes resources economically. Productivity can be adjusted from 5 to 10 l/min. The technique will work even with a weak water pressure (literally from 0.15 bar). The loss of the device is that it will require periodic replacement of batteries.

Column Zanussi GWH 10 Fonte

All the samples presented are the best geysers, despite the allocated places. The choice will already be determined by those objective and subjective indicators that the buyer expects from his purchase.

Among others not included in the list, but no less worthy representatives are Vaillant, Electrolux, Termaxi, Beretta, Vector.

Having decided which geyser is better, the buyer acquires new equipment. It doesn’t matter which model was chosen from the proposed top - in order for it to work better, you need to listen to useful tips.

Entrust installation and connection qualified specialists, because the settings made directly affect the quality of its work.
The outlet temperature should not exceed 60 degrees (for some models, 40 will be enough). This is necessary to prevent the formation of scale that will collect on the membrane.
If it is known in advance hard water, it is better to equip the unit in advance with a system that will prevent the deposition of salts.
During operation of the device, it is forbidden to adjust the temperature by opening the valve from cold water. This will cause steam to form in the system and overpressure due to excessive hot water. This is also bad because water may begin to leak from the heat exchanger.
It is important to clean the igniter and heat exchanger regularly. Here it is necessary to clean the blockages that appear from the products of combustion.
Keep an eye on the water pressure - if it is insufficient, you will have to additionally install a special pump.

Such prevention will help the device perform its “duties” well, and users - all year round enjoy hot water.

Apartments in high-rise buildings, so quickly and densely built in the early 1980s, almost all were equipped with gas water heaters. But the theme of columns concerns not only owners and tenants of apartments. Today, in many private houses, the owners, for convenience and comfort (in connection with the general program of gasification of the territory of Russia), prefer to install gas water heaters. This is mainly due to cost savings. After all, it has been repeatedly proven that the use of gas water heaters is many times more economical and safer than electric ones. In addition, it is more pleasant to look at small kitchens with a geyser, because they are not as bulky as electric ones. And the main problems with such equipment, when there is no standard plumbing from the housing and communal services for hot and cold water, arise precisely at the time of repair or decoration of the kitchen interior. Because, you can’t hide bulky equipment for hot water, and it’s quite problematic to cover it or decorate it.

speakers gas heating there are waters different kind and type. They are distinguished by heating methods and dimensions. When choosing a means for heating water, preference should be given to small gas water heaters. Although they are produced for Russian market just a few firms. But their products are already adapted to our equipment.

The gas water heater is small in size, it is produced from the factory with a standard capacity of 11 heated liters per minute. However, if the apartment (house) is large, or lives there a large number of people who require simultaneous heating at 2-3 points of the room should first discuss this issue with the seller (consultant). After all, speakers are available in different capacities. And in the situation described, the one with a capacity of at least 14-17 heated liters of water per minute is more suitable. At the same time, you should be prepared for the fact that you will have to order a gas water heater of this capacity at the factory, and accordingly wait for it to arrive for some time.

In addition, the columns differ among themselves and in the method of ignition. It can be either automatic or manual. With automatic ignition, the column itself turns on and goes out when the water is opened or closed. And it is recognized as the most economical in terms of gas costs. In the case of manual ignition, it is necessary to regularly monitor the burning column, and do not forget to turn it off at night. And in the morning you have to get up a little earlier so that the water has time to warm up. For those who like to take a morning shower, this is not the most suitable option.

Of the most famous companies producing small gas water heaters, there are two: Bosch and Vaillant. These branded firms have been on the Russian market for a long time, and have proven themselves positively. In particular, due to the fact that their equipment and mechanisms have been worked out and adjusted to our conditions and mounting elements. And they work exclusively for people and their comfort.

For review, let's take several models of gas water heaters.

Geyser of small sizes Bosch WR 10-2P. This model is best known for its compact size, and a sophisticated design that blends very precisely into almost any design. This water heater works silently, has precise control over the flame, which automatically shuts it off when the water is turned off. And in the case when, for some reason, the flame goes out, the gas also automatically shuts off. There is a special adjustment for the power of the column depending on the pressure (pressure) of the water. The ignition of the flame in the column is done manually. Repeated testing proved that the igniter developed by them can burn constantly for a long time.

Vaillant MAG 11 XZ C . This model of Vaillant water heaters is distinguished by the most compactsizes. Refers to wall-mounted equipment with instantaneous water heater. In terms of power, its limit is 11 liters per minute. But at the same time, it has two power switches. If necessary, you can set the heating volume to less than 11 liters. The column itself is made from durable metal with a special protective coating. It is equipped with several security sensors. And its burner is assembled from chrome-plated nickel steel. Which increases the life of all equipment.

Gas water heaters in recent times gained great popularity, since with their help you can forget about problems with the central water supply. By installing a heating device, you can provide comfort not only to the apartment, but also Vacation home. The main thing here is to choose the right gas water heater that will meet all your requirements: efficiency, affordable price, safety and reliability.

Gas water heaters - what is it?

A gas water heater is a device for heating water that occurs after the combustion of natural or liquefied gas. The main advantage of gas water heaters is their efficiency, since natural gas- pretty cheap fuel. The disadvantage is that this gas is quite toxic and dangerous, as it can lead to an explosion or asphyxiation. And therefore, a faulty electric heater is safer than a gas water heater. The water heater must be equipped with a chimney through which combustion products will exit.

The device is enclosed in a metal shell, which houses the burner for controlled combustion. gas fuel. It is she who is responsible for heating the water that flows through the heat exchanger. Gas enters the burner after turning on the water, ignition can be automatic or manual. If the gas appliance is equipped open cam, then the gases go into the chimney, and if closed - into a coaxial metal structure.

There are 2 types of gas water heaters: flow and storage.

The device and principle of operation of gas devices

The gas water heater has a simple design. It consists of:

heat exchanger;
main burner;
ignition burner.

The gas burner resembles a metal box with two tubes (with gas and water). The gas that is released during the combustion of the main burner heats the water in the heat exchanger device (looks like a spiral). New gas appliances are equipped with electronic ignition.

The water heater is put into operation after opening the tap with hot water. And special indicators control the optimal temperature of the water and its pressure, preventing it from overheating. In addition, indicators support the combustion process and do not allow the burner to fade.

For the normal functioning of a gas device, one cannot do without installing a security system: a check valve, a safety valve and a reducer. Also, you can not do without installing a special chimney through which exhaust gases will exit. It is important to pay attention to good ventilation in the room where the water heater will be placed.

Technical characteristics of instantaneous and storage water heaters

Gas instantaneous water heater consists of a burner, which heats the water, and an automatic system that ensures the safety of the device. There are several types of gas flow devices:

Devices with low power(18-20 kW).
Devices with medium power (23-26 kW).
Devices with high power (29-32kW).

Depending on the power of the device, you can determine the approximate water consumption:

Gas instantaneous water heater different types ignition:

Piezo ignition. To get started, you just need to set fire to the igniter, which works automatically.

Electric ignition. This device requires batteries, and it turns on immediately when the hot water tap is opened.

Hydrogenerator. Starts to work after the tap with hot water is opened, batteries are not necessary. For normal operation of the unit, it is necessary that the pressure in the pipeline is optimal (11-16 l / min.).

The gas storage water heater has a rather large capacity: from 15 to 550 liters. His nominal thermal power ranges from 2 to 7 kW. Storage devices heat up quickly enough and can be operated from the mains. The tank of the accumulative unit is covered with high-strength stainless steel, which provides protection against corrosion. In addition, the inside of the tank has electrochemical protection with magnesium or zinc anode.

Additional benefits of storage gas devices include:

Choice of gas heaters

When choosing a flow heater, you need to pay attention to its productivity (l / min.) And compare it with your own water consumption. Standard water flow - 8-19 l / min.

Here is a special formula for determining water consumption: p \u003d q × (t1-t2) × 0.073, where

q - flow rate (l / min.);

p - rated power (W);

t1 - temperature indicator at the outlet of the gas device;

t2 - temperature indicator at the inlet to the gas device.

Example: if the desired water flow is 15 l/min., with a temperature of 45°C, and the temperature indicator at the inlet to the gas device is 11°C, then the required power of the gas flow device is: p = 15 × (45-11) × 0.073 = 37.23 kW.

When choosing a storage heater, you can take as an example the standard water consumption per person:

in the bathroom 160-200 l;
in the shower - 60-100 l;
washbasin - 8-20 l;
sink in the kitchen - 23-35 l.

For example, in a family of 3 people, each of them spends 10 liters of water in 15 minutes for a morning shower: 3 people × 11 minutes × 8 l / min. = 264 liters of water. Then comes breakfast. It will take 13 minutes to wash the dishes with a waste of about 4 l/min: 13 min x 4 l/min. = 52 liters of water. If the approximate water consumption in the evening is the same, then the total consumption will be: 264 + 52 = 316 liters.

After the general result obtained, it is necessary to determine the volume of the storage heater using the following formula: v = v(t-t1)÷(t2-t1), where

v - the required volume of water (received 316 liters);

t- optimum temperature water (for example, 41ºС);

t1 - temperature indicator of water, with which water from the water heater is mixed (for example, 9 ° C);

t2 - temperature indicator of hot water in the heater (about 61ºС).

Total: v \u003d 316 (41 - 9) ÷ (61 - 9) \u003d about 189 liters. After this calculation, you need to choose storage water heater gas with a similar capacity.

The process of installing a gas water heater

The procedure for installing a geyser requires the implementation of many points. It is important here not only to follow the installation rules, but to pay attention to what the wall is made of. It must be made of non-combustible building material, and the pressure must be no more than 0.1 atmosphere.

Installation of a gas water heater takes place in several stages:

Coordination of the gas heater project with related services.
Selection of a place for ventilation. Usually this happens like this - a 2-meter pipe is pulled through a hole in the roof. It is important to mask it with a rosette.
Using the building level, you need to install the column. It is important to fix it well to the surface with screws. flexible pipe from PVC, you need to connect the heater to the chimney: at one end, the pipe must be attached to the gas appliance, and at the other, to the previously installed outlet.
Gas connection. Everything you need - using a gas welding machine in gas pipe install a tee. If a threaded connection is present, it can simply be screwed into the pipe. Then connect the tee to the gas cock. After that, measure the distance between the gas appliance and the pipe. This is the piece of pipe you will need. At the place where the pipe will pass, you need to insert snap-in clips that will help the pipe to hold firmly against the wall. Using the fitting and union nut, attach the pipe to the gas appliance.
Then you need to connect to the water supply. To do this, a similar tee (as on a gas pipe) must also be inserted into the pipeline. Drill the wall and install the clips to secure the plumbing. To control the water pressure in the tube, you need to install an air valve and put filters (salt and magnesium) next to the heater.

Typical breakdowns and how to fix them

Repair of a gas water heater is an occupation for highly qualified specialists. However, some damage can be repaired by hand. Before starting work, you need to close the water and gas supply valves. After that, you need to unscrew the fixing screws and remove the handles and the column body.

Here are some examples of when it does not light up gas water heater:

Water heaters with an automatic ignition system can run out of batteries. All you need to do is change the batteries.
For water heaters that have a built-in generator, the piezoelectric element, electrode or power cable may fail. It is necessary to clean the contacts of the automatic ignition system, check the electrodes and wires for a malfunction. If all these actions do not help, you need to check and replace the power button and the piezoelectric element.
If there is no draft, you need to clean the ventilation, for this you should call a specialist.
In case of insufficient pressure, attention should be paid to the plumbing or heater assembly. All that is needed is cleaning pipes, flushing or replacing filters.
If the geyser does not turn on, check and, if necessary, replace the membrane of the water unit. To do this, remove the water-gas unit and, by unscrewing the screws, separate its water part. Before removing the rubber plate, it is important to remember its location. Then you need to clean the inside of the cover and install a new rubber piece on the plate with the stem. It is better to replace the membrane with a silicone one, which lasts longer. And finally, you can tighten the screws (preferably diagonally).
Some gas appliances have a water flow adjustment knob. In the event that the column does not ignite, you need to check how the mechanical switch is located. If the pressure is not large enough and the column does not start, set the knob to the left extreme position and switch to the right until the device turns on. You need to adjust the jet at start-up.

Bosch water heaters

The German brand Bosch has long been a model of high quality and durability. And so the Bosch gas water heater has a lot of advantages. It:

quality assembly;
automatic control method;
security control system;
continues to work effectively even at low pressure of gas and water;
easy to use;
unique design;
a huge range (power, type of ignition).

Gas devices of this brand are made according to the latest technologies and tested according to a variety of parameters, and therefore they work practically without failures.

Bosch gas appliances are designed for instant water heating. They do not have a tank, and the water is heated by a burner in a straight line through a heat exchanger. For optimal performance gas heater, you need to install a signaling device, a hose and a filter.

Water heaters "Oasis"

Gas heaters "Oasis" are made by Italian designers on high-quality equipment. They are made in two types: electronic accumulative and flow gas.

The gas water heater "Oasis" has many advantages:

The casing of the device is made of high quality plastic.
The inner side of the tank has a special anti-corrosion coating (magnesium anode).
Excellent thermal insulation.
A special indicator regulates the water temperature.
Copper heating element instantly heats water.
The thermostat regulates the water temperature (does not overheat). After overheating, the gas appliance switches off automatically.
Mechanical control method.
Thrift.
Stylish design.
Low price.

Water heaters "Ariston"

The Italian company "Ariston" has been developing water-heating and heating appliances. The gas water heater "Ariston" is designed to heat and maintain the temperature of water. Gas devices of this brand have many advantages:

Water heating devices "Neva"

Gas appliances brand "Neva" only recently began to gain popularity. These are standard gas appliances made in accordance with the latest technologies on European equipment. The gas water heater "Neva" has both pluses and minuses. The advantages of gas devices of this brand include:

The heat exchanger made of high-quality copper which increases the term of operation of the device.
The program for ignition/extinguishing of the burner device at the start of the flow.
The program of ignition of gas during the extinction of the fire.
Mertik electronic control unit.
Firebox with water cooling system.
Water and gas unit.
Tank coating resistant to corrosion.
Traction indicator.

Flow heaters "Neva" are less productive, have more low temperature heating water and higher consumption of electrical energy.

The cost of water heaters

Prices for water heating devices depend on the brand, functionality and quality of the device. For example, prices for water heaters of the Ariston brand range from 4,200 rubles. up to 13,500 rubles For a minimum amount, you can purchase a unit with a thermostat that changes the temperature of the water. This model is characterized by high thermal insulation, and inner side the tank is coated with an anti-corrosion coating. In addition, this model quickly heats up water.

For the maximum amount, you can purchase a water heater with a sufficiently high power and capacity. Tank with anti-corrosion coating, provides rapid heating of water, has a beautiful design.

German gas water heaters are distinguished by a higher cost. The price of Bosh speakers ranges from 7,000 rubles. up to 80,000 rubles For 7,000 you can purchase a device with a fairly high productivity and an improved security system. Rapid water heating and overheating protection system. Execution materials - stainless steel and copper.

For 80,000 rubles. you can purchase a fairly powerful and voluminous unit with many functions, made of quality materials.

Recently, Russian gas water heaters have begun to gain popularity. Reviews about the columns of the brand "Neva" there are different. However, more and more buyers note the high quality and attractive design of gas devices of this brand. Gas water heaters "Neva" can be purchased for 6,000 - 11,000 rubles.

The cost of Oasis water heaters ranges from 2,000 rubles. up to 7,000 rubles

A gas water heater is a guarantee of comfort in any home. The main thing is to choose the most suitable option. And with an assortment gas appliances there will be no problems.

Water heaters allow you to get hot water at any time, so they are often purchased for greater comfort in an apartment or house. Among them, gas water heaters are the most profitable, however modern devices of this type have a large list of characteristics, which can be difficult for an ordinary user to understand.

Before you go to the store for such equipment, you should find out what types of such heaters are, as well as read the reviews of specialists and consumers.

Kinds

Depending on power

With low power (9-20 kW). Such devices can provide warm water only 1 point.
With medium power (20-24 kW). By installing such a column, you can count on the simultaneous use of 2 points, but the intensity in them will be different (for example, the pressure in the bathroom will be stronger than in the kitchen).
With high power (more than 25 kW). Such equipment is capable of supplying hot water to 2 points with the same high pressure or to 3 points with different intensities.

Given the type of ignition

With manual ignition. This is an inconvenient and outdated option, which is becoming less and less common these days.
With piezo ignition (semi-automatic). The burner inside the apparatus is constantly smoldering, and the ignition is provided by turning on the button. At the same time, gas expenses are higher, but the column itself is cheaper.
With electric ignition (automatic). The most expensive, but also the most convenient ignition option, which uses a spark from batteries, and the burner in the column ignites when the tap is opened.

Depending on the flame regulation

With automatic regulation. The most convenient option that maintains a certain temperature, despite changes in water pressure.
With smooth regulation.
With step control.

Depending on the exhaust system

Turbocharged. Such equipment brings combustion products to the street through a special hole in the wall.
With outlet to the chimney. In such a device, the combustion products are discharged into a common chimney for the whole house.

Geysers for an apartment

Buying a column city apartment, you first need to decide on the power of the device, depending on the needs for hot water. If you need to provide hot water only to the bathroom or only the kitchen, you can stop at a low-power device.

Further, for a city apartment, it is important to pay attention to the safety of the device. The homeowner must be sure that the column will not become dangerous for the apartment or its residents if the flame suddenly goes out or the water pressure in the pipes changes. In addition, you should find out in advance about all permissions for installing a column. Sometimes it is required to obtain approval not only from the gas service, but also from neighbors.

When choosing equipment that will heat water for both shower and dishwashing at the same time, look for more powerful speakers.

Reviews

Estimating power modern speakers, users and professionals prefer medium-power devices that can supply hot water to 2 taps.

When discussing manufacturers, most buyers speak well of speakers from such foreign companies:

Ariston - the equipment of this Italian manufacturer is called solid, and the prices for it are considered acceptable.
Vaillant - everyone likes a large number of options in the devices of this brand, as well as the high quality of the devices.
Beretta - in the models of this manufacturer, consumers like the design and reliable work most of all.
Bosch - people are attracted by the good reputation of the brand, so these speakers are in demand for their safety and simplicity. Plus, they have a pretty affordable price.
Termaxi - devices of this company are attracted by the presence of a modulating burner. Modulation is also found in the models Neva 5514, Beretta Idrabagno, speakers from Junker and Vaillant.

Attitude to Russian manufacturers ambiguous, but almost all consumers note that the higher the price of a domestic device, the better its characteristics. Some buyers are satisfied with the long service life and decent quality of domestic speakers. Others like the availability of accessories and repair work. Those who speak about heaters Russian production negative, note short term battery life, column sensitivity to water pressure, frequent breakdowns.

It is also important to follow the instructions when using, and if there is any problem with the column, immediately contact the technical service. In most cases, negative experience with the column can be avoided if you do not overheat the device, pay attention to cleaning the chimney, install the column correctly and change batteries in time (if necessary). In addition, any heater must be adjusted, and for this task it is best to invite a specialist.

As for the type of ignition, the opinions of consumers in relation to it are very different. Most buyers call piezo ignition the most reliable and practical, but at the same time they note that it is more convenient to use electric ignition. At the same time, users confirm that devices with electric ignition are more capricious about water pressure.

But starting with a hydrogenerator causes a negative reaction among many consumers. Almost all of them note that with such a most modern form ignition, you have to additionally install a booster pump and listen to the dissatisfaction of the neighbors about the low water pressure in the common riser.

When buying a Russian column, experienced users and experts advise installing an additional pump in order to maintain sufficient water pressure in the pipes. For very hard water, it is also recommended to install a filter to prevent scale formation and damage to the heat exchanger.

For information on what you should pay attention to when buying a geyser, see the video of the "Heat engineering SPb" channel.