Replacing a faucet in the kitchen how to change the faucet yourself

Step 1. Dismantling the old mixer and preparing for installation

Before you install the faucet in the kitchen, you need to turn off the water (the riser does not need to be closed) and, just in case, lay a rag on the bottom of the sink so that small parts do not fall into it, and large ones do not damage.

Of course, replacing a kitchen faucet requires removing the old faucet. For this you need:

First, disconnect the old hoses from the cold and hot water pipes with your hands or with an open-end wrench. Do not forget to put a basin under them and drain all the rest of the water, after which the pipe threads must be wiped clean.
Then, using a tubular wrench, you need to unscrew the clamping nut on the stud (or two studs) that secures the faucet to the sink (right below it). When you unscrew this nut, the metal half washer will also come off.
Now you need to pull the mixer together with the hoses from the sink hole. Well, that's all, you can proceed to the next step.

Faucet mixer installation

Due to the fact that the replacement of the faucet in the bathroom is a simple and short procedure, the price of this service is low.

from 550 rub. for mixer installation

OrderHow we work:

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Choose a convenient working time

The master will perform all the necessary work

All problems are fixed!

However, we do not recommend doing this work yourself, as this provokes the occurrence of leaks in the future. Employees of the company "Masters of All Trades" guarantee you reliable sealing and long-term operation of plumbing without any complaints.

Faucet installation cost

Installing a standard mixer (single lever/herringbone)	PC.	from 900 rub.
Installing a faucet with a shower hose	PC.	from 1100 rub.
Electric mixer installation	PC.	from 1800 rub.
Replacing the standard mixer (single lever / herringbone)	PC.	from 1300 rub.
Replacing a faucet with a shower hose	PC.	from 1400 rub.
Installation of a ball valve (under the sink / toilet)	PC.	from 200 rub.
Installation of a ball valve (angle)	PC.	from 600 rubles
Installation of a ball valve (riser)	PC.	from 550 rub.
Chasing walls in concrete for electrical cables	p/m	from 180 rub.
Shtrobleniye of walls in a brick for an electric cable	p/m	from 140 rub.
Repair (leak)	PC.	from 700 rubles
Departure of the master	Is free

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Price list for 2018

You can learn more about the prices for the installation of a mixer or a tap in Moscow by contacting our operators.

Our advantages

Being engaged in the installation of faucets in the bathroom at a low price, we nevertheless value our reputation. Therefore, we offer our customers to evaluate the following advantages of mutual cooperation:

conclusion of a formal contract;
providing a guarantee of 1 year for all types of work;
home visits to any districts of Moscow;
the presence of only experienced plumbers in the state.

If you are interested in our offer and want to know how much it costs to replace a bathroom faucet, please contact our consultants or check the price list on the website. Keep in mind that the prices indicated in it are fixed, but if you combine several types of work, you can save a lot. For example, when replacing a faucet in the bathroom and in the kitchen, the final price will be lower.

Tel.: +7 (499) 350-77-02

Opening hours: from 10:00 to 21:000

Just give us a call. We'll do the rest for you!

Mixer replacement

Not a single, even the most expensive faucet will serve you forever. Sooner or later, it will have to be changed, since repairs often do not justify themselves, especially for economy class models.

As a rule, when installing and replacing a faucet in a kitchen or bathroom, the price for work in Moscow starts at 1,000 rubles and depends on the design of the mounted faucet and the complexity of the work. It is better to carry out this procedure in advance, that is, approximately 6-8 years after the installation of the previous mixer, even if its operation is satisfactory.

Also, we are often approached for the installation of a built-in shower faucet in the bathroom: the price and aesthetic appearance of such a design are very attractive. In fact, it is a familiar shower head, but all the water supply is hidden in the wall.Technologically, its installation is practically no different from connecting an ordinary shower.

Installation of a faucet in the bathroom

When installing a new faucet in the bathroom, the cost of the work must necessarily include the dismantling of the old one, if any.

First of all, the siphon is removed: care must be taken here, since water may remain at the joints and in its lower part. After that, the fixing nuts are unscrewed, and the old mixer is removed.

The new mechanism is usually wound on the old eyeliner, if it is in a satisfactory condition.

To calculate exactly how much it will cost to replace and install a faucet in your bathroom, contact us right now. We promise that the price will not seem too high to you.

Faucet installation in all districts of Moscow:

Choice of mixer hoses

The fitting of the inlet hose is made of soft non-ferrous metal. The dismantling of these elements from the tap is often accompanied by a change in the geometry of the thread, which further leads to a decrease in the tightness of the connection. That is why, when installing a new device, experts recommend that the mixer hoses be completely replaced, given that they are supplied as standard on most models. However, their length most often does not exceed 30 cm, which may not be enough to connect the mixer to the water supply system, and the quality of these components, as a rule, leaves much to be desired.

When purchasing new hoses, pay attention to the following parameters:

hose length;
diameter and type of threaded connection with the water supply system;
fitting length.

The dimensions of the hose must match the distance between the faucet and the connection to the plumbing system.

Hoses should be purchased with different fitting lengths for more convenient assembly of the device.

There are options with a threaded part of two types: "father" and "mother".

The standard nut diameter is ½ inch. To connect to the water supply system, hoses of the “mother” type are most often used.

In some cases, hoses are not used at all to connect the mixer to the plumbing system. Instead, fixed metal-plastic pipes are installed. To connect them to the mixer, specialized fittings with fittings are used.

Step 3. Install the faucet on the sink

And now it's time to put the faucet on the sink.

By the way, it is more convenient to install the mixer on a sink that has not yet been built in, since it is not very convenient to work getting under the countertop (in this case, the installation is done in this way).

We put the ends of the hoses into the sink hole, put the mixer and ask someone to hold it so that you feel comfortable.

Then, from below, under the countertop or from the bottom of the removed sink, we put a second rubber pressure washer on the eyeliners. As a result, it will turn out that two rubber seals will protect the body both above and below the sink. Now we also fasten a horseshoe-shaped metal washer (photo below).

From below we put on a stud-nut and twist it with:

Tubular wrench, in case you need to replace the faucet on an already installed sink. The photo below shows the mount from below.

Open-end wrench - in case you install the mixer on a new or removed sink. Of course, after that you need to install the sink itself on the countertop and only then proceed to connect the mixer to the pipes of cold and hot water.

Tighten the nut firmly, but not too tight!

Execution of work

Scheme for replacing the old mixer.

Before installing the faucet on the sink, it is necessary to install the sealing ring in the groove on its mating surface. Then the eyeliner and hairpin are threaded into the hole in the sink.Installation is carried out using a horseshoe-shaped rubber or plastic gasket and a metal strip, which must be installed on the back of the sink on a stud and tightened with a nut. It is more convenient to tighten the nut with a long socket wrench. Open-end wrenches lack amplitude due to the proximity of sink elements and supply hoses or needles. On some models of mixers, you need to install two studs.

If the installation of the faucet is carried out directly on the sink installed on the sink, then it is more convenient to carry out installation with an assistant who should hold the faucet from above in the desired position

It is important to correctly install it relative to the hole in the sink, otherwise leakage through the gaps is possible.

There are also other versions of mixers. It is more convenient to install a faucet with a large lower nut and a thread according to the diameter of the hole in the sink. Such a mixer does not require precise positioning. It takes place in the middle of the hole due to the design. The lower nut is simply tightened with your own hands without wrenches.

When the faucet is securely and correctly fixed to the sink, you can put it into working position. Then each flexible nut is screwed onto its own faucet under the sink or metal-plastic pipes are installed to the faucet needles. Before screwing on the flexible hose nuts, make sure that there are gaskets in the connection. On some models, they may fall out. The nuts are tightened with a 24mm open-end wrench or adjustable wrench with little effort on the wrench handle. The generally accepted arrangement of water inlets is the inlet of cold water on the right, and hot on the left.

After installing the siphon, you can alternately open the tap on cold and then hot water and make sure there are no leaks. It is convenient to do this by wiping the joints with toilet paper. Do not confuse leaks with condensate. It does not appear immediately, but after a certain amount of cold water flows through the mixer, more often in winter.

https://youtube.com/watch?v=SV1cKbJrQQ0

Now you know how to install a faucet in the kitchen. The main thing in the process of performing work is to carefully control the placement of sealing elements and the tightening torque of the joints. And then the installation of the faucet in the kitchen will be quick and without negative consequences for you and your neighbors below.

Kitchen faucet assembly

Having prepared the tools, you need to assemble the device. In fact, all equipment is sold semi-unassembled. Especially expensive models. So, how to assemble a mixer without errors? You must carefully study the instructions. All manufacturers supplying cranes in disassembled form must complete the set with instructions. Assemble the structure strictly according to the recommendations in the leaflet.

Also, the technical data sheet for plumbing equipment necessarily shows how to install a faucet on the sink, and all dimensions are specified. They will come in handy if the faucet does not come with an eyeliner or gaskets, eccentrics. It may be necessary to replace the fittings if the removal of the equipment did not go completely smoothly. Having figured out how to assemble a kitchen faucet, we proceed directly to the installation.

Remember: the installation of a kitchen faucet can be carried out in several ways. Start studying the question of how to fix the faucet on the bowl of the kitchen sink, only after choosing the correct installation method. This saves you from having to dismantle the new device.

Mixer replacement

Faucet replacement is one of the services that our company provides for residents of Moscow. Our qualified plumbers will dismantle, install and connect various types of faucets.

It is believed that the installation of a crane or its replacement is a matter that any owner can handle.When installing the faucet in the bathroom or in the kitchen, you should correctly assemble it taking into account the model, securely fix the faucet, and correctly connect it to the water pipes so that there are no problems during further operation. Therefore, it is best if installation work is carried out by professional plumbers.

Why it is profitable to cooperate with us

Our master plumbers will repair, replace, install almost any faucets in the bathroom, in the kitchen. We provide the service for residents of Moscow, at the request of customers and the Moscow region.
We provide advice on choosing a model
Exact compliance with the deadlines, urgent departure of plumbers
Favorable prices, there is a system of discounts
Warranty (at the request of the customer we issue a document) 1 year

Types of work when replacing the mixer

Replacing a faucet in the bathroom or in the kitchen is the best option if the old one is out of order, leaking and repairing it is impossible. We perform the following types of work:

Dismantling the old mixer
Preparing a site for a new faucet
We install faucets in the bathroom, kitchen, shower
Changing gaskets
We test the system for performance

What mixers do we work with?

A faucet is a plumbing fixture that regulates the flow of water. He is responsible for mixing cold and hot water, as a result of which the user receives water at the required temperature.

We will replace and install the following types of faucets:

two-handle (separate taps): they are simple in design and reliable
single-lever: allow you to simultaneously adjust the intensity of the water flow and its temperature
electronic: equipped with optical or electronic sensors. They allow you to automatically open the water, maintain the set temperature, if there is a backlight, provide a decorative function.
under the filter (have a double spout): equipped with a special valve for filtered water.

We also mount valve, single-lever, ceramic, ball, wall mixers. At the request of the client, our specialists will install the faucet on the sink, wall, side, podium, rack, shelf. In this case, the installation is more complicated, so it will require additional materials.

Faucet installation and replacement cost

The price of replacing a mixer depends on the complexity of the work being done: whether dismantling is required, whether preparatory work is necessary, as well as on the model of the mixer. Below are indicative prices:

Faucet installation (price does not include preparatory work)
For sink (regular)	from 450 rub.
For a sink (if there is a water seal)	from 750 rub.
for bidet	400 rub.
single lever	from 750 - 1450 rubles.
For bathroom (with shower head and bar)	from 750 - 2000 rubles.
For bathroom (regular with wall mount)	from 750 - 1500 rubles.
With thermostat	1990 rubles / piece
With siphon (set)	1500 rub.
Electronic	2690 rubles / piece

Mixer installation (price of additional services)
Replacing the gasket in the sewer pipe	150 rubles / piece
Cranbox replacement	320 rubles / piece
Thread cutting	from 95-170 rubles.
Shower hose installation	100 rub.
Ball valve installation	200-450 rub.
Dismantling of the old/modern faucet	250 rubles / piece
Drilling a hole in a sink	150 rubles / piece

The final cost is negotiated with each client separately, it all depends on the amount of work performed, the requirements of the customer.

Mixer installation - steps

Set of required tools: adjustable wrench, gaskets (usually included), wrenches, water hoses

Before installation, it is important to read the instructions, draw a diagram

Connection can be made in 2 ways: using flexible hoses in a metal sheath, using tubes (brass or copper).

The steps for installing the faucet depend on where you plan to install it (in the bathroom, in the kitchen), as well as on its type.

For example, when installing a single-lever faucet, you should tighten the stud on which the half-shell is put on and secure everything with a nut. Only after that the mixer itself is connected.

Two-valve mixers are equipped with tubes (they put nuts on, wind the sealant, connect it to the water supply, tighten the nuts) or a tee (attach to the pipes with help).

How much does it cost to change a faucet in a bathroom, kitchen to replace a faucet in Moscow

Create a task on YouDo if you need to replace the faucet. The site registered private locksmiths and specialized companies in Moscow, performing any plumbing work at competitive prices.

Submit an application to search for a contractor, indicating that you want to call a plumber to your home. Masters will read the task and offer you qualified assistance in repairing mixers.

Stages of installing new equipment

After placing an order and agreeing with a specialist on a convenient call time for you, the master will arrive to provide plumbing services and correctly connect the equipment. Installation of a new turnkey mixer is carried out in several stages:

dismantling of old equipment in which a breakdown occurred
preparation of the site for the installation of the structure
fixture plumbing
connecting hoses to the part body
connection to the water supply system

Once the installation is complete, the technicians will test the system to make sure the hardware is working properly.

YouDo performers will install the faucet on the sink (in the bathroom or in the kitchen), shower cabin. Specialists provide a wide range of additional services - they can change faulty gaskets, valves, clean and repair breakdowns in the siphon, and carry out other work in houses and apartments.

Due to the absence of intermediaries between you and the master, you can directly ask how much it costs to install a mixer, and in what time it will be possible to complete the task.

Duration of plumbing work

Locksmiths understand the installation of equipment, so they can urgently change the faucet in the bathroom and connect the new design to the water supply system.

Experts are ready to promptly provide assistance - professionally remove the old faulty element and install a new one in your house or apartment. Installation time depends on the following circumstances:

the need to dismantle old broken plumbing
category of installation complexity and type of mixer to be connected
master's experience

All YouDo performers strive to reduce your waiting time by urgently replacing a broken valve with new Christmas trees or watering cans. It is in the interests of craftsmen to leave you with a good impression of the work. The rating of the contractor directly depends on the number of customers who are satisfied with the quality of services.

Formation of the price for installation

YouDo performers offer inexpensive replacement of the faucet in the bathroom - the price is calculated on an individual basis. The mixer itself can be of any type - two-handle or single-lever, simple, with a shower head or thermostat.

The cost of the work of the master is formed by such factors:

consumables costs
the presence of old plumbing that needs to be dismantled
artist's individual rates

How much does it cost to install a faucet with a siphon on washbasins, bidets, showers, the specialist will tell after assessing the scope of work.

Agree on tariffs with a specialist, stating the amount you are willing to pay for a call

The master will take into account your wishes and offer the best conditions for installing mixers

Benefits of ordering on YouDo

Entrust the installation of the faucet in the sink or bathtub to a qualified master. Locksmiths registered on YouDo are ready to professionally and inexpensively install faucets of any type - herringbone or with shower heads, in a bathtub or on a washbasin. Find out how much it costs to change the faucet in the bathroom, and order the services of performers.

When ordering services on YouDo, you get many advantages:

filing an application online, saving time searching for trusted companies in Moscow
convenient call time
high-quality replaced plumbing with fastening and connection in the bathroom or in the kitchen

YouDo performers professionally dismantle a failed faucet in a sink, bathtub or washbasin. Our masters can replace the turnkey mixer at a high level and within the agreed time frame.

Dismantling the old structure

Before delving into the solution of the question of how to change the faucet in the kitchen, it is necessary to remove the worn out structure. The main rule here is that dismantling should be neat and unhurried. No need to break out and tear off the old faucet. All operations must be performed carefully so that you do not have to additionally repair the sink, pipeline outlets, and so on. What is the procedure for the first stage in the process, how to install the faucet on the sink - dismantling?

Shut off the water at the stand.
Place a container under the hose connection area.
Carefully remove the washers for hot and cold water inlets from the pipelines.

It may happen that this procedure is actually impossible to perform. If you do not know how to remove the faucet in the kitchen, use the advice of experts (described below). Long-term operation of metal parts in conditions of high humidity probably led to rusting and “sticking” of the nodes. To disconnect the old kitchen faucet hose from the water pipe, you can use special tools: vinegar, lubricants, acids, and so on. Only the procedure must be carried out carefully.

Unscrew the hoses on the mixer.

The case if you want to install an old flexible hose for a new plumbing fixture. It is recommended to decide in advance how to unscrew the hose from the mixer without damaging the threaded connections

It is worth acting carefully. Bent metal parts can make it impossible to dismantle the crane

You will need to carry them out with a grinder.

Disconnect the sink from the sewer.
Disconnect the valve nut.

This procedure will also be difficult for the reason described above. When wondering how to install a mixer in place of an old plumbing fixture, it should be borne in mind that you will have to work in a limited space. Therefore, if the sink on the countertop is removable, it is better to dismantle it too. At this stage, you will also have to think about how to remove the faucet from the sink bowl, since the fixing nut may not give in immediately (probability of 75%). And it may not succumb even after using special lubricants and acids (they act with any degree of adhesion of metal assemblies, but you will need to wait 2-4 hours). If, after trying the above methods, you failed to unscrew the nut, and you don’t know how to remove the faucet from the sink, use a grinder. Need to cut the nut.

Remove faucet.

Now you know how to remove the faucet in the kitchen from the sink, but before proceeding with the installation of a new plumbing fixture, carefully inspect the attachment and connection points of the faucet. On the sink bowl, if it is metal, rust zones could appear. In this place, the metal will be fragile, which means that installing a faucet in the kitchen can become much more complicated. Problems can also be with the places where the hoses are connected to the sewer and water supply. Before fixing the faucet on the sink, make sure that it will be installed on serviceable and reliable functional units.

Instrument assembly

Mixer design diagram.

Usually, new faucets are supplied with faucets or cartridges already screwed on. Sooner or later they will have to be changed or serviced, most likely with their own hands. But it will be very difficult to unscrew this detail in a couple of years. Therefore, it is worth taking care of it now. Do not be lazy, unscrew the faucet boxes or cartridges and lubricate the threads with food grade grease.If not, you can use any other lubricant. But then, before using water from the mixer, it will need to be rinsed with good pressure.

Installation of all water-conducting connections of the mixer, which do not work under excessive pressure, is carried out by hand, without the use of keys, this eliminates the possibility of damage to the sealing rings and gaskets. This is how the spout and pull-out shower are screwed on. Additional pressure connections must be installed using wrenches, but even in this case, excessive force should be avoided. It is advisable to install flexible hoses or needles on the mixer using FUM tape or linen tow. The latter is lubricated with drying oil.

It is necessary to correctly assemble in the following order: first, install a flexible hose with a short thread, then with a long one. If you plan to install a mixer without a flexible connection, then you need to install special adapter needles. One of them is straight, the other is curved. In order to orient the curved needle in space correctly, you need to alternately try to install it in the holes for hot and cold water. In at least one of them, it should be installed with a bend outward and away from the wall. In addition, a complete stud is screwed into the mating plane of the mixer in advance. It is desirable to tighten it with pliers.

Step 2. Assembly of the mixer and eyeliners

Installing a faucet in the kitchen begins with its assembly, that is, with connection to flexible hoses or hard leads.

If you have a two-valve mixer as in the photo on the right, then most likely you need to assemble it first. To do this, insert the spout (faucet) into the body up to the restrictive ring and manually, without tightening too much, screw them together.

Now we take the FUM tape and wrap it around the end of the eyeliner a little.

Taping the tip is not necessary as the hose already has a gasket.

Then we insert the end of the first eyeliner into the corresponding hole in the mixer as in the photo below and fasten it first with our own hands, and then slightly tighten it with an open-end wrench by 10. In the same way, we fasten the second hose.

It is very important not to tighten too much, otherwise the lining will be damaged! But not holding out is also bad. And finally, we fasten the pin-stud (or 2 studs) with the thread up into the hole that is supposed to be for it

Our assembled faucet is almost ready for installation. It remains to thread both eyeliners into the o-ring, bring it to the base of the mixer body and fix it there as shown in the photo on the right

And finally, we fasten the pin-stud (or 2 studs) with the thread up into the hole that is supposed to be for it. Our assembled faucet is almost ready for installation. It remains to thread both eyeliners into the o-ring, bring it to the base of the mixer body and fix it there as shown in the photo on the right.

Installing a faucet in the bathroom and in the kitchen Installing a faucet

Mixer installation in Moscow. The choice and installation of the mixer should be approached with all seriousness. How long you will use the mixer and how much nerves you will spend on its repair and maintenance will depend on your choice.

What to look for when choosing a mixer? How is the faucet installed in the bathroom and in the kitchen?

Mixer selection

The kitchen faucet usually has a long gooseneck for ease of use.

There are options for mixers, in which the watering can forms not one jet, but several, and also, it is pulled out from the base and can also be used in non-sinks.

Usually, it is better to buy a faucet of a well-known proven brand, you will spend more on the purchase, but save yourself from constant repairs. But some inexpensive faucets can also be quite high quality.

The washbasin faucet has a rather short fixed spout, which is often not convenient when using the washbasin.

If convenience is more important for you than appearance, then you can use kitchen faucets in washbasins, they are interchangeable in terms of the type of attachment, but the design of the bathroom will be violated.

Shower and bath faucet. There is also a huge selection in all price categories. Basically, you will have to choose a mixer depending on the required functions.

For a shower, a faucet without a gooseneck is suitable, with only one watering can, for a bathroom, a faucet with a short gooseneck.

The quality of any mixers can be approximately determined by the weight of the mixer, the heavier it is, the thicker the walls and the more reliable the mixer, although this is not the only indicator.

Installing a faucet in the kitchen

Installing a faucet in the kitchen usually does not take much time. The faucet is mounted on the base of the sink and is connected to the water supply network.

Installing a faucet on a washbasin is similar to installing it in a kitchen, but most often it is quite difficult to get to the place where the faucet is attached. In some cases, when replacing the faucet, it may be necessary to dismantle the sink.

Installing a bath faucet and installing a faucet in a shower cabin are fundamentally different from the previous two. Firstly, the mixer rests on the water pipes themselves.

Secondly, alignment of the mixer with eccentrics is required. In addition, you need to fix the shower head and other parts, depending on the configuration of the faucet.

The installation height of the faucet above the bath is also important, this will facilitate installation and subsequent operation.

Why you should contact us

The company "Center of personal services" has experience in this field since 2009.
Guarantees for all types of services up to 3 years.
Home visit is free.
The masters of the "Center for Consumer Services" are equipped with all the most modern tools.
We work 24 hours a day without days off and holidays.
Assistance in the purchase and delivery of materials and components.
It is possible to pay for services in cash or by credit card.
Discounts are provided for regular customers.

Installation of a mixer with a flexible hose on the spiers

It is worth noting here that a flexible hose for a kitchen faucet may or may not be supplied. It all depends on the manufacturer and the price of the device. But even if the hose for the kitchen faucet is included, evaluate its quality. In 46% of cases, "native" products are not suitable for operation. You should not begin to figure out how to install a faucet hose if the hoses do not inspire confidence. It is better to buy new products that are suitable in quality and technical characteristics. Before connecting the faucet to the sink, read the parameters of the flexible hose - they are listed in the package insert.

How to remove the old

Before starting work, turn off the water supply to the tap, drain the remnants that are in the pipes. Now you can start replacing the faucet in the kitchen. To remove the old faucet from the sink, unscrew the nut that is screwed onto its body from the bottom of the sink. If the sink is installed in a kitchen cabinet, it is very inconvenient to work. It's better to remove the washer. For this you will have to:

Open the siphon. There are many designs of siphons, but each has a nut that must be unscrewed. It is hard to confuse it - it has protrusions for a better grip. Unscrew the nut, remove the lower part of the siphon.
Unscrew the hot and cold water hoses that go to the mixer. The cap nuts are usually removed. To do this, you need a key for 22 or 24.
Cut the sealant around the perimeter of the sink, if any.
Loosen the screws securing the sink to the countertop. You will see the bolts if you "dive" into the table.

One of the siphon options and a nut that needs to be twisted

Now you can lift and turn the sink. Here you will see a nut that needs to be unscrewed. You will need two wrenches for this job. One is holding the body from the “front” side of the sink, the second is unscrewing the nut.

Sometimes it is very difficult to remove the old faucet in the kitchen: it “sticks”.For this case, kerosene or universal grease in cans of WD-40 is suitable. Both substances have a low density and are able to seep into microscopic cracks. The composition or kerosene is applied to the connection that needs to be disassembled, they wait 10-15 minutes, they try to unscrew it. If all the tricks did not help, there is a simple method that is suitable if the old mixer is not going to be used anywhere else: you can cut the body along with the nut with a grinder. The method is tough, but after suffering for an hour in an attempt to remove the nut, they resort to it.

https://youtube.com/watch?v=hGm7_jmhoi8

If the faucet is installed on the countertop, you will have to work “from the inside” - crawl into the closet with a flashlight, and unscrew the nut in this way.