Choosing the Quietest Electric Kettle: Useful Instructions for Buyers Why does the kettle make noise before boiling? Sound change when boiling water
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2014-05-31
Why does the kettle make more noise before boiling?
Decision:
Before boiling, in the hottest areas of the kettle, for example near the walls, steam bubbles begin to form. However, as a result of contact with colder masses of water, the temperature of the bubble walls may not be sufficient to create atmospheric pressure in the bubbles. Therefore, the newly formed bubbles collapse, which causes a lot of noise.
Have you ever thought about what makes sounds when the kettle boils?
If you think carefully, you can guess.
Why does the kettle make noise when heated?
And it’s best to immediately go and look into the kettle - we will see rising air bubbles, which at the end of their path burst and make a sound.
Where do these bubbles come from?
Let's say that we have an ordinary electric kettle that heats water using a current that heats the spirals from the bottom of the kettle. Therefore, the temperature at the bottom of the kettle is very high, which is higher than at the top of the vessel. Because of this, bubbles form at the bottom, which form during boiling. After the water gets very hot, the bubbles separate from the bottom of the kettle and float to the top, where they shrink until they burst.
Later we don't hear the popping because the temperature in the kettle is so high. The kettle is boiling and all we hear is gurgling, as these bubbles get very large from heating and become much larger.
Maybe, of course, this is due to the contact of hot with cold, and when the water is very hot, the sound becomes less. But we still hear the gurgling!
By the way, we should not forget that sounds fade in the volume of the room, and that our ear perceives low and high frequencies differently, and because of this, the noise becomes less noticeable when heated.
In conclusion, I’ll say: “What difference does it make how it gurgles there, the main thing is that the tea is tasty!”
Grade: 3
Uniqueness: 97 %
Publication date: 03/30/2012 19:41
Faktrum warns: despite the fact that this is very important to know, this is not taught in school. When water boils, its composition changes, which is completely normal: volatile components turn into steam and evaporate. Thus, boiled water is safe to drink.
But when the water boils again, everything changes for the worse:
Boiled water is completely tasteless. If it is boiled several times, it becomes very, very tasteless. Some may argue that raw water also has no taste. Not at all. Do a little experiment.
At regular intervals, drink tap water, filtered water, boiled once and boiled many times. All of these liquids will taste different.
Life is in full swing
When you drink the last version (boiled many times), an unpleasant aftertaste will remain in your mouth, some kind of metallic taste.
In addition, if you decide to boil water again, then pay attention to how much time has passed since the last boiling process. If a sufficiently long time has passed, then it is better to drain the water and pour fresh water into the kettle. The fact is that various harmful microorganisms develop faster in stagnant water, and more dust and other debris gets into it.
So here are some helpful tips:
- for boiling each time pour fresh water;
- do not boil the liquid again and do not add fresh water to its remains;
- before boiling the water, let it stand for several hours so that heavy substances settle to the bottom;
- after pouring boiling water into a thermos (for preparing a medicinal collection, for example), close it with a cork after a few minutes, not immediately.
See also: This is why we should start work or study no earlier than 10 am
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uForum.uz > THEMATIC FORUMS > Warm-up for the brain > Why does the kettle make noise
View Full Version : Why is the kettle making noise?
09.03.2011, 10:42
Alexander Sofienkov
09.03.2011, 10:48
Why does the kettle with water make noise just before boiling and the noise drops sharply at the moment of boiling? What processes create such noise? Don't ask for a guess... I don't know her, I can only guess.
At the heated bottom of the kettle, water turns into steam, bubbles with steam rise up. But before reaching the surface, the vapor cools down, the bubbles collapse.
Hence the noise.
The whole process can be seen in a glass teapot.
09.03.2011, 10:53
Alexander Sofienkov
09.03.2011, 11:04
But before reaching the surface, the vapor cools down, the bubbles collapse. Hence the noise. So why the noise? They collapse - they don't burst. Moreover, they collapse as evenly as they appear. By the way, when water is heated in a saucepan (without a lid), there is no such sound, but with your explanation, the sound should not disappear.
Maybe the hydrodynamic and acoustic characteristics of the kettle somehow affect 🙂
Gotta watch
Evgeniy Sklyarevskiy
09.03.2011, 11:38
in a saucepan (without a lid) there is no such sound. So it's all about the spout!
09.03.2011, 11:45
Collapsing - it's not bursting.
09.03.2011, 11:52
Clap your hands and think about where the noise comes from. When I press my hands, there is no noise (this corresponds to the reverse absorption of steam into water), and if there is, it is from escaping air escaping from my hands (and we don’t have escaping steam - the vapor pressure is not lower than the pressure of water on the walls of the bubble). So?
So it's all about the nose!
Why does the kettle make noise when turned on, then it stops, and then it makes noise until it boils?
Maybe ... what makes the spout whistle when the water is not boiling and what prevents the spout from whistling more when the steam is boiling? It seems that the process of vaporization is much simpler, but we don’t really know anything here either.
09.03.2011, 13:02
So why the noise? They collapse - they don't burst. Moreover, they collapse as evenly as they appear.
When collapsing, a short-term local change in pressure occurs - the essence is the same sound wave. This is not the only example - for the same reason, when an incandescent lamp is broken, the ringing is accompanied by a clearly audible pop. The uniformity of the appearance and bursting of bubbles is relative - some time passes between the collapses, the duration of these intervals is different, but it fits well into certain limits. The result is a real "white noise", the "voice" of chaos.
Clap your hands and think about where the noise comes from.
What does one hand clap sound like?
09.03.2011, 16:15
This is not the only example - for the same reason, when an incandescent lamp is broken, the ringing is accompanied by a clearly audible pop. Anton. Here the situation is different. The vapor collects in a bubble and turns back into water adhering to colder water. There is no overpressure at all. The ball bursts/collapses absolutely uniformly over a relatively long time, comparable to the life time of the bubble.
09.03.2011, 20:09
There is no overpressure at all.
There is 🙂 Only not excessive, but vice versa - negative, since when the vapor condenses, the bubble turns out to be filled with nothing. It collapses, hence the sound.
Alexander Sofienkov
10.03.2011, 01:02
I found an interesting article about boiling water: http://www.t-z-n.ru/prehme/int_boiling.html
10.03.2011, 01:43
Only not excessive, but vice versa - negative. So the process of dissolution of the bubble is continuous, where does a void without pressure suddenly form? That's the question.
11.03.2011, 13:51
The vapor bubbles travel from the hot bottom to the cold upper layers and become water, collapsing at high speed and forming sound waves. The noise will be both in the kettle and in the pan.
Moving to an area with a higher pressure, the bubble cavitates and collapses, emitting a shock wave. "Cavitation" occurs as a result of a sharp decrease in pressure in the liquid. This is what destroys the surface of propeller pumps, hydraulic turbines. Thanks to “cavitation” in washing machines, gentle washing is obtained, and cleaning antiques is more convenient.
11.03.2011, 14:45
Steam bubbles travel from the hot bottom to the cold top layers and become water, collapsing at high speed and forming sound waves. Any proof? There will be noise in both the kettle and the pot. Do you have a shurpa in your cauldron before boiling?
11.03.2011, 14:48
Why does the kettle with water make noise just before boiling and the noise drops sharply at the moment of boiling?
And you yourself sit on the comforter ... also, probably silently, this will not work .... 🙂
But seriously, the electric kettle is noisy too.
I think that this is due to the heating of the spiral (heating element) and the rapid heating of the water near it. In the case of gas, the metal on the sides of the kettle heats up, and the droplets of steam and the film of water wetting the sides evaporate quickly (the effect is almost the same as if you drop water on the hot metal) ....
i.e. it is a local boiling of small water droplets. And when the water boils already throughout the volume, then it evaporates all evenly ...
11.03.2011, 15:23
Such peremptory arguments: Vapor bubbles travel from the hot bottom to the cold upper layers and become water, collapsing at high speed and forming sound waves. Is there any confirmation? Mathematical model? Noise will be both in the kettle and in the pan. Do you have a shurpa in the cauldron before boiling?
14.03.2011, 11:41
And who needs it? What is the question? Why is the kettle noisy? Is it necessary to model mathematically to explain why?
Try *** confirmation to do the following experiments:
1. Heat the kettle with different amount of water: from 200ml to 1.5L.
At the beginning of heating, the kettle does not make a sound for several seconds; then appears
and the noise grows, which, having reached its maximum, begins to subside and
replaced by the gurgling of boiling water.
The amount of water does not affect the intensity of the sound, but the more water,
the longer each of the noise periods (silence, rising and
fading noise, gurgling).
2. The same, but with the lid open.
The nature of the noise change is the same (silence, rising and
fading noise, gurgling), but: firstly, the noise became louder, and secondly, while
the same amount of water, the duration of the second stage increased.
The noise appears along with small bubbles on the kettle element, which,
breaking away from the heating element, they do not reach the surface of the water, but “dissolve” in it.
3. Place a hollow object (glass
bottle).
The strength of the sound will decrease, the nature of the noise will not change.
4. Clamp the kettle between two wooden blocks.
The result of the experiment coincides with the result of experiment No. 2.
Hypothesis 1.
When switched on, the heating element of the kettle
begins to intensively heat the lower layers of water, with
release of small vapor bubbles. steam bubbles
begin to rise and, having come into contact with not yet
heated mass of water, condense. As a result
instantaneous condensation occurs multiple "collapse" of small vapor bubbles,
which generates the vibration of water and, as a result,
noise. The increase in noise at the beginning of the experiments is explained
an increase in the number of bubbles - adjacent to
tenu the layer of water begins to warm up. Explanation
damping down is that the temperature of the water in the kettle
the process of condensation of steam in water also increases
slows down and the water begins to boil.
Confirmation of this hypothesis:
The appearance of noise along with bubbles on the heating element of the kettle;
Noise reduction when heating water in the kettle;
Noise reduction when installing an empty glass bottle on the heating element -
the area of contact of the heating element with water has decreased.
The body of the kettle cannot be considered a source of noise, because:
With the lid open, the kettle makes more noise, and the kettle clamped in the "vice"
no less noisy, i.e. The case also serves as sound insulation.
The final confirmation of the hypothesis will be the heating of water in that
the same kettle, but with a reduced power of the heating element.
Experiment with his ten.
Findings:
The amount of water in the kettle affects the rate of boiling: the more water,
the longer it takes to boil;
The closed lid keeps the heat in the kettle and the water boils faster;
The kettle makes less noise if water that has not yet cooled down is heated in it.
The water in the pan before boiling is noisy for me, but for you? 🙂
14.03.2011, 18:59
The water in the pan before boiling is noisy for me, and for you? I sometimes boil water in a cauldron and the cauldron does not make noise. And the kettle is noisy ... even with the lid open 🙂
Evgeniy Sklyarevskiy
15.03.2011, 00:13
I sometimes boil water in a cauldron and the cauldron does not make noise. And the kettle makes noise ... even with the lid open. And if you solder the spout to the cauldron? What are the predictions?
15.03.2011, 08:58
And if you solder the spout to the cauldron? What are the predictions? There will be no noise ... it's all about the temperature of the surface in contact with water. In a cauldron, it is lower, since the cast iron is thick, and in a tin pan it is higher, since the tin is thinner. I say without a mathematical model you can’t figure it out with bubbles 🙂
15.03.2011, 14:03
In a cauldron it is lower, since the cast iron is thick, and in a tin pan it is higher, since the tin is thinner. But it seemed to me that the difference was in the surface area. The cast iron will warm up anyway, but the contact area of the cauldron is larger and "more voluminous" or something ... accordingly, the liquid heats up over a larger volume, and the difference in temperature between the lower and upper layers of water is smaller.
15.03.2011, 14:30
and "more voluminous" or something ... Maybe so. Due to the thick wall, heat is better redistributed from the bottom to the edges ... but then a large cauldron for pilaf would have to "make noise", but it also does not make noise.
15.03.2011, 17:09
What is noise for you? How many db? 🙂
What happens if the same water in a kettle is boiled under vacuum?
28.03.2011, 11:40
What happens if the same water in a kettle is boiled under vacuum? I have a gas burner - it does not burn in a vacuum.
Due to the absence of thoughts, something that is mistaken for wit gushes.
Noise occurs in conditions of high water temperature gradient. In thin-walled and electric kettles, this situation is typical, but not in a cauldron.
28.03.2011, 16:09
gushing something that is taken for wit Did they say something funny here?
Where? Noise occurs in conditions of high water temperature gradient. In thin-walled and electric kettles, this situation is typical, but not in a cauldron. I agree with this, but it would be better to clarify everything right away. For example, in a thin-walled frying pan (wok, for example) would sound appear? The answer is yes and no - depends on other physical parameters. For the sound to appear before boiling, you need a combination of:
conclusion: not in every kettle and not always the water makes noise before boiling - the point here is not in the shape of the spout, but in the amount of water and the design of the kettle. If, for example, a boiler is placed in a ceramic teapot, then according to the resulting theory, the water should not make noise before boiling.
28.03.2011, 20:46
gushing something that is taken for wit Did they say something funny here? Where? Noise occurs in conditions of high water temperature gradient. In thin-walled and electric kettles, this situation is typical, but not in a cauldron. I agree with this, but it would be better to clarify everything right away. For example, in a thin-walled frying pan (wok, for example) would sound appear? The answer is yes and no - depends on other physical parameters. For the sound to appear before boiling, you need a combination of:
1) thin and preferably flat bottom (for high heat transfer from the burner to the water);
2) a high wall of the vessel (and therefore a flat bottom), so that the water in the upper layers is heated only due to the convection of warm water, but not from the walls - for this reason, the kaza is not suitable - heat transfer comes from the walls of the cauldron and the sound does not appears.
3) A sufficient amount of water in the vessel so that the heating of the upper layers is significantly behind the lower ones.
Those. conclusion: not in every kettle and not always the water makes noise before boiling - the point here is not in the shape of the spout, but in the amount of water and the design of the kettle. If, for example, a boiler is placed in a ceramic teapot, then according to the resulting theory, the water should not make noise before boiling.
It shouldn't be your way, but it's noisy. Could it be cavitation?
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Today we will talk about electric kettles, or rather about the speculations and misconceptions associated with them.
You can write your opinion in the comments.
Myth 1. The water in the kettle is saturated with harmful substances during boiling.
This is only true for the lowest quality products. If the body of the electric kettle is made of high quality material, there is no danger. The most environmentally friendly in this regard are glass and ceramics, which are inherently incapable of entering into chemical reactions. Moreover, contrary to popular belief, modern glass teapots are very durable and resistant to damage.
But their metal counterparts are more reliable than ceramic and glass electric kettles. Metal products are more durable, and high-quality stainless steel also does not emit any harmful components when heated (note: by the way, there are a lot of low-quality imported stainless steel on the cookware market now - manufacturers and managers do not think about consumer health - see our articles about dishes. But This applies to teapots less, because in them just water comes into contact with stainless steel, and not an acidic environment, as in pots).
As for plastic models, for their production, theoretically, only safe food-grade plastic should be used, the shelf life of which is about 3 years. In our opinion, metal and glass electric kettles are still preferable to plastic ones, because. plasticizers, though in small doses, but gradually pass into the water.
Why is the electric does the kettle start making noise as soon as scale appears in it?
And after the expiration of these 3 years, it is certainly better to replace the device with a new one. There is a wide range of electric kettles of different models on the store websites, so if your product needs to be replaced, just go and choose a new suitable device.
Myth 2 (this is not a myth, but the truth - editor's note). Electric kettles can cause a fire
Modern kettles have a power of 2-2.5 kW and are designed for standard wiring, sometimes you can find 3 kW models that can only be used if the wiring is in perfect condition. The use of the latter type of product with insufficiently high-quality wiring can just cause a short circuit. The only thing worth noting is that a short circuit due to poor-quality wiring can occur when using any electrical appliance - not just a kettle. In any case, you should be careful with electric kettles.
Myth 3. In electric kettles with a “gold-plated” spiral, scale does not form.
“Gilding” on the spiral of the product is titanium nitride. This compound is resistant to a variety of chemicals and protects the coil only from corrosion. Protection against scale is provided by the use of purified or spring water, as well as the purchase of kettles equipped with built-in filters. It is better not to buy teapots with a “gold-plated” spiral, as the “gold” gradually passes into the water you consume, and there is nothing good in that.
Myth 4. You can’t heat a small amount of water in an electric kettle.
If the device has an auto-off function when boiling and works without water, you can safely heat water for one cup in it. It is only necessary to ensure that the liquid completely covers the heating element.
Myth 5. Electric kettles are suitable for heating soup and boiling milk.
Which of the first users of electric kettles did not try to boil dumplings, sausages or heat soup in them? Remember the result? And also remember that the manual for any product says that nothing but water can be placed in it, since food particles can stick to the heating element, and the expanded liquid can squeeze out the device cover? Similarly, you should not use sparkling water to clean the kettle from scale. Our inquisitive minds have long found out that the same Coca-Cola or Sprite contain orthophosphoric and citric acids, which dissolve plaque. However, along with them, there are also dyes with sweeteners, which are easily eaten into the coating of the heating element and the inside of the instrument case.
Every day, hundreds of millions of kitchens around the world boil water several times a day. And every person at least once in his life wondered: “why does noise occur before boiling?”. Someone immediately recalls the school curriculum and an unusual word “cavitation” pops up in their memory.
“Some bubbles are bursting - hence the noise,” the subconscious mind helpfully prompts. But few people remember the exact course of the process. And, moreover, few people know that noise is created simultaneously by two phenomena.
What is a boil?
What is a boil? There is a clear definition: “Boiling is vaporization that occurs simultaneously in the entire volume of a liquid.” To start the process, the following conditions must be met:
- The presence of centers of vaporization;
- Constant heat supply;
A liquid reaching a certain temperature, called the boiling point.
Why do steam bubbles form in boiling water?
The centers of vaporization, around which bubbles begin to appear, are small cracks, greasy spots, solid particles - dust particles. They trap small volumes of air, and the liquid traps the air until it begins to boil. Water also contains dissolved gases: oxygen, nitrogen, carbon dioxide. The bonds between gas molecules and water molecules are weak and quickly break down when heated. When the dissolved gas is released, the pressure of the water causes it to assume the most energy efficient, spherical shape. You get bubbles.
After the release of gas, the high temperature proceeds to separate the molecules of the liquid. Steam is formed, which is released into the already formed bubbles. This is how the boiling process begins.
Causes of noise when boiling
The first signs of boiling can be observed at the bottom of the kettle - there is the highest temperature, it is there that the first bubbles appear. Each of them contains gas and saturated steam. While the bubble is small, it is held by surface tension forces. Then the fast moving water molecules that form the vapor accumulate inside the bubble and it begins to expand. Detachment occurs at the moment when the Archimedes force pushing the bubble out becomes greater than the tension forces holding it. The bubble is released and rushes to the surface
The separation causes the fluid to vibrate. It is these vibrations that are the first cause of noise during boiling.. You can estimate the frequency of the received sound. It is inversely proportional to the time it takes the bubble to break away from the bottom. Time characterizes the strength of the oscillation caused by separation.
Calculations showed that the average separation time is about 0.01 seconds, which means that the sound frequency is about 100 Hz. It was these data that allowed scientists to understand that there is some other reason for the noise when the kettle boils. After all, the real sound frequency was measured and turned out to be an order of magnitude higher than the calculated one.
The discovery of the dual nature of noise was made by the Scottish scientist Joseph Black. This happened in the 18th century, during his work at the University of Edinburgh.
The main source of noise when boiling water
It was Joseph Black who first investigated the boiling process and identified the source of additional noise. He found that not all bubbles breaking away from the bottom and walls reach the surface. And at the very beginning of the boiling process, not a single bubble reaches the surface - they disappear in the water column.
The phenomenon so interested the scientist that he spent several sleepless nights trying to find the reason for the disappearance of the bubbles. Research helped to draw the right conclusion. The answer turned out to be simple - the temperature difference. At the beginning of their movement, the bubbles are in the hottest part of the vessel. Saturated vapor pressure allows them to maintain a spherical shape.
Sound change when boiling water
When moving up, the bubbles enter the colder layers. The steam begins to condense, the pressure inside drops. At some point, it can no longer hold its shape and collapses. The phenomenon of formation, separation and collapse of bubbles during boiling is called "cavitation". The necessary calculations were carried out, which showed that the frequency of sound during the collapse is close to 1000 Hz. The data correspond to the experimentally measured parameters. As the liquid heats up, the bubbles stop collapsing and the noise level changes. The sound frequency is markedly reduced. Soon, without exception, all the bubbles reach the surface. The noise subsides, there is a "gurgling".
The birth, detachment, ascent and bursting of bubbles is a physical phenomenon that millions of people see every day. But boiling is more complicated than it first appears. Two processes can be distinguished: cavitation and oscillation of the liquid during bubble separation. Both cause a characteristic sound, but the acoustic effect of one is easy to distinguish from the other. By the noise, you can easily determine when the water in the kettle has heated up to the desired temperature.
Show content articles
Recently, manufacturers of electric kettles have been implementing the idea of silent household appliances. They are trying to make the most advanced silent electric kettle. Users have access to unique models that, when boiling, do not boil, do not make sounds and do not click.
The reason for the noisy operation of the electric kettle
The heating element of the device is located at the bottom, so the water is heated in layers. When it reaches a boil, bubbles form in the tank, which are pushed to the top. When exposed to cold water, they burst. It is the bubbling that is perceived as noise.
Boiling water in a kettle is perceived as noise
Important! The sounds of the kettle immediately after switching on occur when scale builds up on the heater and indicate a malfunction.
General criteria for choosing electric kettles
To choose a quiet kitchen electric kettle among a huge range, you should familiarize yourself with the device selection criteria:
Rating of the best quiet electric kettles
When choosing the most reliable silent kettle for the home, we pay attention to an electrical appliance with a high-quality assembly, safe and energy efficient.
Budget models
Offers for economical buyers.
| Model | Characteristics |
|
Tefal KO 150F Delfini Plus
Simple, without additional options, reliable electric kettle worth 2.2 thousand rubles. The body of the device is made of high quality food grade plastic. Equipped with a comfortable handle and a wide spout, there is a lock to turn on without water. The model quickly boils water without much noise. Product weight - 0.8 kg, volume - 1.5 liters. Advantages:
|
|
Polaris PWK 1731CC
1.7 liter ceramic electric appliance with a power of 1800 watts. The device is priced at about 2 thousand rubles. embellished with a stylish pattern. The body is one-piece, without water level inserts. Removable cover with rubber insert. The spout is wide, equipped with a ceramic mesh instead of a filter. The kettle is equipped with silicone feet to suppress noise. Advantages:
|
|
Scarlett SC-1024 (2013)
A glass teapot worth within 1.5 thousand rubles, differs in power of 2.2 kW, with a volume of 1.7 liters. The model is equipped with an internal light indication of operation - during boiling, the water is highlighted with blue light. The lid opens with the push of a button. The device easily rotates 360 degrees on the stand and is equipped with protection against overheating. Advantages:
Minuses: At first, an unpleasant smell from the lid. |
|
Ladomir 140
Ceramic device for almost 1 thousand rubles. outwardly similar to a teapot. The power is 1.2 kW, and the volume of the tank is 1 liter. The device has protection against starting without water and an automatic stop when boiling. Power button with LED backlight.
|
Middle price segment
Devices for rational users.
| Model | Characteristics |
|
Bosch TWK 3A011 (13,14,17)
An electric kettle worth up to 3.5 thousand rubles. with a volume of 1.7 liters and a power of 2.4 kW, it is equipped with a closed spiral. The device is made in a plastic case, equipped with boil-off protection and a lid lock. The model has an indication of nutrition and the amount of liquid. Advantages:
|
|
Redmond M153
The device is made in a stainless steel case. Its cost is about 3.2 thousand rubles, but it is justified by resistance to damage. The volume of the tank is 1.7 liters. Water level indicators are located on both sides of the case. The power button has a blue backlight. Advantages:
|
|
Polaris PWK1748CAD
An electric kettle that costs about 3.2 thousand rubles. has a 1.7 liter body. Heating is carried out from a closed spiral. The rotating case - from stainless steel. The power of the device is 2.2 kW. Works at 4 levels of temperature which are regulated by the user by means of buttons on a support. The operating mode is displayed on the LCD. The lid opens with a button. Advantages:
|
|
Bosch TWK 8611
Electric kettle for 4 thousand rubles. with a jug of 1.5 liters. The user can adjust the heating temperature from 70 to 100 degrees. The double-walled device keeps the water hot for up to 30 minutes. Advantages:
Cons: easily soiled case. |
Premium Models
Expensive electric kettles that are worth their money.
| Model | Characteristics |
|
Bork K711
Model for almost 10 thousand rubles. with innovative Stealth technology - noise reduction due to the annular diffuser. The volume of the tank is 1.7 liters, and the power of the device is 2.4 kW. There are options for blocking the inclusion without water, indication of inclusion and filling level. When boiling, a sound is heard. The lid opens with a button. The filter is removed for cleaning. Advantages:
|
|
Redmond Sky Kettle M170S
A "smart" device in a steel case with a plastic shell costing about 6 thousand rubles. The volume of the kettle is 1.7 liters, the power is 2.4 kW. It is equipped with 5 modes of maintenance of temperature and water heating. It can be used to make baby food, yellow, green and white tea. The device is controlled by a smartphone remotely or by buttons on the touch panel. The device is equipped with R4S technology, which will wake you up at a predetermined time with a beautiful melody, as well as a night light option.
To unlock, you need to press the "+/-" button on the control panel three times. |
|
Rommelsbacher TA1400
A modern multifunctional model in a glass case with several heating modes and a power of 1.2-1.4 kW. The cost of a device with a built-in teapot is about 13 thousand rubles. The rubberized legs of a support have additional noise reduction. Information about one of the programs is displayed on the LCD display. The jug is made of durable Schott Duran glass. The volume is 1.7 liters. The device rotates in a circle and maintains heat for 30 minutes. Advantages:
|
- The greater the power of the electric kettle, the faster it heats up;
- The most convenient and quiet home kettle is an electrical appliance that must be protected from being turned on without water and overheating;
- The optimal volume of a jug for a family of 3 people is from 1.7 to 2 liters;
- The heating element of the closed type will eliminate the risk of injury;
- Durable housing does not heat up;
- Models with an open coil burn out faster;
- Ceramic teapots weigh a lot and are subjected to mechanical stress, but retain heat longer;
- The glass container needs careful care.
Watch a video on how to choose an electric kettle