Home Article How to choose a mixer with a thermostat

How to choose a mixer with a thermostat

Thermostatic mixer tap for kitchen and bath. operating principles, selection, installation

Adjust the water temperature in the sink or shower. not always an easy task. Pressure in the hot and cold water pipes is usually not the same. In addition, these values tend to change suddenly. a situation familiar to residents of apartment buildings. A great idea has been invented to solve these problems. a mixer with a thermostat. It allows you to get a stable flow of water of a given temperature. In this article, the master plumber will tell you about the principle of operation and types of modern thermostatic faucets.

Pressure and temperature variations in water pipes are an unpleasant situation, which people in blocks of flats and detached houses have to deal with. This is particularly annoying in the morning, when the jet from the sink is now hot and now cold.

choose, mixer, thermostat

This is due to the fact that everyone in the house at this time begins to use water intensively for washing and bathing. The water consumption increases dramatically, causing pressure drops.

The main purpose of the thermostatic mixer is to obtain a constant temperature flow of water in the spout for use in a washbasin or shower.

According to domestic standards, the temperature of DHW in the centralized system can range from 50 to 70 degrees. The range is quite large. This is good for utility operators, they do not have to worry about going beyond the limit of norms. And consumers are forced to suffer from inconveniences. We have to install special regulating devices or to permanently adjust water supply to the tap.

The first are the most simple and affordable. Their adjustment of the desired temperature and water flow is made by a lever or valve, and the maintenance of set parameters. due to pure mechanics and physical properties of the internal elements of the device. The second and third have in their composition electronic components, which require constant power supply.

The scheme clearly shows the structure of a thermostatic faucet: 1. hot water; 2. eccentric; 3. non-return valve; 4. switch; 5. ceramic head adjuster; 6. aerator; 7. temperature cartridge; 8. temperature detector; 9. temperature regulation; 10. cold water

Functioning of this kind of mixers is based on movement of a movable valve inside the device, which reacts to changes in the parameters of the mixed water jet. If in one pipe the pressure increases, the cartridge simply shifts and reduces the flow of incoming water for mixing from the other pipe. As a result, the temperature in the spout remains the same.

The internal moving valve contains a material that reacts quickly and sensitively to all changes in the temperature of the water that enters the mixing valve. In most cases the sensor-thermocomponent is a synthetic wax. It shrinks and expands as a result of the temperature and causes the cartridge to move.

Many of the mechanical models have a safety feature on the regulating valve that limits the maximum temperature setting to 38 C. These indicators are considered the most comfortable for a person.

But even in the absence of a fuse hotter than 60-65 degrees water from the thermostatic mixer will not flow. Everything is designed so that when the specified temperatures are reached, the wax expands to the maximum and the valve shuts off the DHW pipe completely. Scalds from boiling water are by definition excluded here.

Note! Using a mixer tap with a thermostat ensures that even small children can bathe safely and comfortably. the surface is never too hot

The valve shifts internally almost immediately. Any change in the temperature or pressure of the incoming water causes an immediate expansion/decreasing of the thermostat element. As a result, even strong fluctuations in the flow parameters of the hot water and HTW pipes do not affect the overall jet in the spout. Water will flow from it only at user-set values.

Some models use bimetallic plates instead of wax. The principle of their operation is similar. They bend under the influence of temperature and move the valve to the desired depth.

Faucets with electronic thermostats are more expensive, technically more complicated, and require a power supply. They are either plugged into a socket outlet through a power adapter or have a battery that needs to be replaced regularly.

The water reading in this device is controlled by electronic sensors. All figures are displayed on a special liquid crystal screen. The display often shows both temperature and pressure. But only one value can be used.

In private households, an electronic thermostat mixer with a display is often a redundant piece of equipment. Such equipment is intended mainly for installation in hospitals or other public institutions. It is much more common in pool showers and office building restrooms than in kitchens or private cottage bathrooms.

However, if you plan to build a “smart home” with all sorts of life-saving gadgets, the mixer with an electronic thermostat is just what is needed. It certainly will not be a nuisance in such a dwelling.

E.C.A. | Thermostatic Concealed Bath Shower Mixer Installation Video

All thermostatic faucets work on a similar principle. They are used to set the temperature required and then the water flow valve is simply opened. They function in the same way, but the model line is quite extensive. And each device has its own individual features and advantages.

They are installed on the wall, a tabletop or a sanitary device by the open mounting method. Or they are installed in a closed way. when only the valves or levers and the spout are visible. And all the internal parts in such installation are hidden behind the wall panelling.

Thermostatic mixer taps are most often installed in the bathroom. In the kitchen, they are not in demand. The temperature of the water in the kitchen sink has to be changed constantly. it may be cold to drink or fill the kettle, or warm to wash food, or hot to wash dishes.

Types and mechanisms of thermostatic faucets

They come in mechanical temperature control and electronic. Let’s start with the design and operation of a mechanically controlled thermostat. Regulation of the amount of cold and hot water supplied in such a product is carried out by the moving valve. If the water pressure in one of the pipes increases and changes the flow temperature, which is monitored by a sensitive thermocouple sensor, the cartridge moves and reduces the amount of liquid from the “problem” pipe. The sensor is usually a synthetic wax that expands when heated and contracts when cooled. Changing its dimensions and leads to the displacement of the shut-off cartridge. Instead of wax, bimetallic plates can sometimes be used, which bend under the influence of temperature and again move the valve. And all this happens in seconds, so the user does not experience any inconvenience while showering or washing hands. Many mechanical thermostats with a temperature sensor have fuses that prevent dangerously high temperatures.

Electronic thermostat of hot and cold water is more technically complex, as the water temperature in this case is controlled by electronic sensors. Here, they are responsible for the direction in which the shut-off element will move. Such products need a constant power supply (can operate from the network or batteries) and are controlled by buttons (on the mixer body itself or a separate panel), sensors or remote control. In addition, they have a display that shows the water temperature and, in some models, also the pressure in the pipes.

Types by function

The most popular and necessary is a thermostatic mixer for the shower or for the sink, as here the same water temperature is always required. Bidet and kitchen sink models are not on the market very often. The first. because we do not have bidets yet enjoy great popularity, and the second. because in the kitchen we often change the temperature of the water to wash dishes or to wash vegetables, which can reduce the benefits of having a thermostat to zero.

Faucets with a thermostat for the bathroom: features and varieties

A faucet with a thermostat allows you to maintain a set water temperature, regardless of an unexpected change in pressure. In addition, its use allows you to reduce the cost of housing and communal services. About the features of such models and the rules of its choice we will talk in this article.

Pros and cons

The main advantages of thermostatic faucets. safety and ease of operation. Having set the required temperature parameters, the user does not depend on changing pressure, pressure or temperature of water from central water supply. It is not only convenient and comfortable during water procedures, but also safe. The issue of safety is especially relevant for families with elderly people and small children.

Such faucets are especially in demand in homes with centralized heating. Here, the water pressure depends on how many people use water at the same time. Residents of the upper floors suffer most, since in the evening (when most people use the bathroom or kitchen), the water pressure changes, and with it, the temperature.

However, temperature “jumps” are found even when using modern instantaneous water heaters and gas boilers. These units must supply water at a certain temperature (and stay within a predetermined range). But if this does not happen, it makes sense to consider getting a thermostatic mixer.

The ability to adjust the volume of hot and cold water makes it possible to achieve economical water consumption and thereby reduce your rent costs. The device regulates the flow of hot water, which has a higher tariff.

The disadvantages are primarily the higher cost of mixers with a thermostat compared to classic products. In addition, they are very demanding on the water head in the pipes.

Advantages and disadvantages

The advantages of using thermostatic bath and shower mixers are obvious and undeniable:

  • Despite the complex device, the device is extremely easy to use;
  • provides a water supply with a stable high temperature;
  • it is not difficult to install by yourself;
  • water always comes at the right head;
  • the device is safe even in the event of an emergency, such as a cold or hot water outage;
  • it reduces the water consumption, which without a thermostatic faucet was lost when setting the temperature manually;
  • allows you to save energy for water heating in standalone DHW.

Among the disadvantages are mainly the high price. Although the owners of houses and apartments, who have experienced this device in practice, consider their costs quite justified.

Another problem that often causes problems with thermostatic faucets is the poor quality of tap water, especially characteristic of centralized water supply in apartment buildings.

Over time, the device becomes clogged, its performance deteriorates, and unpleasant noise appears during use.

At best the problem can be fixed by cleaning the device, but sometimes the faucet simply breaks and has to be completely replaced. Increase the service life by using coarse filters installed at the inlets to the faucet.

Some models are equipped with special sieves, which should sift out debris, but practice shows that the effectiveness of these materials in combination with the water supply even Soviet construction is insignificant.

Another problem. low water pressure in the household water supply. Each faucet’s data sheet shows the minimum pressure at which it works effectively. If the necessary indicators are absent, it does not make much sense to purchase and install a mixer with a thermostat.

Correct the situation by installing a special pump, which will raise the pressure in the water supply. So in order to put a thermostatic mixer under conditions of low quality tap water or low water pressure in the system, you will need additional costs.

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These points should be taken into account when planning to purchase a thermostatic faucet. You can adjust the water pressure with such a device only in the direction of decreasing.

You should also remember that thermostatic mixers, especially their electronic version, are quite difficult to repair. This can hardly be done at home, you need to contact specialized service centers. In addition, not all problems can be solved by repair.

But if you follow the operating conditions recommended by the manufacturer, the mixer with a thermostat can work flawlessly for several years.

Installing a Thermostatically Controlled Faucet

In general, the installation of a thermostatic mixer is not too different from the installation of a conventional model. It is exactly the same need to connect it to the pipes with cold and hot water, seal all connections, check the operation of the device.

Of course, the procedure for installing the device is slightly different depending on the place of installation:

In addition, in the installation of each individual model of faucet may have its own nuances. Therefore, before installing it, you should study the manufacturer’s instructions in detail.

In general, the order of installation of a mixer with a thermostat may look as follows:

  • Completely shut off the cold and hot water supply in the house.
  • If necessary, clean and lubricate shut-off valves to reliably shut off the flow of water.
  • Dismantle old mixer.
  • Unscrew the thermostat and mixer mounting nuts.
  • Check the metal discs and threads of the new device.
  • Unscrew the eccentric discs (counterclockwise movements).
  • Clean off accumulated dirt from discs and outlets.
  • Replace the old cleaned discs or replace them with new discs.
  • Wrap a layer of sealant around the faucet threads: FUM tape, gasket, etc.п.
  • Install the gaskets.
  • Slide the nuts on the outlets as far as they will go.
  • Put on the decorative lugs.
  • Screw on the mixer.
  • Install the spout, shower head and other attachments.
  • Thoroughly seal all joints.
  • Turn on the water, check the appliance and make sure it is not leaking.
  • Set the water temperature for the mixer.

The installation procedure for the Hansgrohe wall-mounted faucet model is shown in the following video:

To install a built-in mixer with a thermostatic regulator for the bathroom, first a special cavity is made in the wall, as well as tunnels for bringing hot and cold water to the mixer, if necessary.

But when at the place of installation is planned to create a false wall, for example, from drywall, the main wall need not be chiseled, the device will be hidden behind the panel of the false wall.

Use hemp, linen thread, FUM tape or other suitable sealant to seal the threaded connections between the mixer and the thermostat, just as you would with a conventional mixer

A very important point when connecting a thermostatic faucet is the proper connection of the device to hot and cold water pipes.

The inputs for the respective outlets on the mixer are marked. Most models are made under the European standard, so the cold water to the faucet should be brought to the right and hot water to the left.

In the former Soviet space, the plumbing is done exactly the other way around: cold water is brought to the left side of the faucet. When installing a faucet with a thermostat on an old-style water line, these features can cause confusion.

Incorrect installation can cause the faucet to malfunction.

Special flexible hoses can be used to properly connect a faucet with a thermostat in the bathroom to the cold and hot water supply

It is not always possible to simply turn the faucet, because its spout will then be directed upwards. To install a wall-mounted model will have to significantly redo the plumbing.

For other types of faucets, it will be sufficient to use a pair of flexible hoses to make the connection correctly.

The electronic faucet has a control panel for adjusting the electronic faucet. It controls the water flow and adjusts the temperature of the water flow to the spout.

In mechanical models, the setting is done differently. By default, the manufacturer usually leaves the device in the neutral position, which allows you to get a water flow of 38 degrees. Even if these settings are suitable and do not need to be changed, they must be fixed.

To do this remove the protective cap from the mixer, under which the control valve is hidden, and turn it. To measure water temperature, it is recommended to use an ordinary thermometer.

To adjust the mechanical faucet model with a thermostat uses a special lever, hidden under the protective cap, and a household thermometer

Centralized water supply in most cases is ruthless to modern plumbing fixtures, including thermostatic faucets.

In addition to the aforementioned problem with poor water quality, water hammer is a hazard, as well as sudden pressure drops in the plumbing system.

To prevent problems, it is worth installing a non-return valve and/or regulator at the inlet to the apartment plumbing system, which should be adjusted according to the characteristics of the faucet.

After finishing in 2008. Engineering. A graduate of St. Petersburg State Polytechnic University, Faculty of Civil Engineering, majoring in Sanitary Engineering. Has patents for inventions in the field of sanitary engineering, which are implemented in production. The author of a unique course to improve the skills of plumbers. Visiting Russian-speaking lecturer at the International University “Ontario College Certificate” in plumbing engineering.

Thermostat varieties based on purpose and installation method

Depending on the purpose, thermostatic faucets can be central or single-point operation. The first version is represented by a single-centered design that can be used for multiple water points. This kind of faucet is installed in rooms with high traffic. It can be a sports complexes, rooms of industrial use. This option is also suitable for a residential house, where the water supply has several points: shower, bidet, washbasin.

Important! Buying and operating a single central thermostatic mixer is more economical than installing several units.

Three-way mixer taps for single-spot use are classified according to their functionality. They are all subdivided into devices for open or concealed installation. They are used for the kitchen, washbasin, bathtub and shower stall. Kitchen faucets with a thermostat can be installed on the wall, countertop or sink in the open way, and you can also use a closed installation. In this case, the spout and faucet valves are still visible. All other elements are concealed in the wall. For this purpose, recessed faucets with a thermostat are purchased.

Thermostatically controlled faucets are used for washbasins, bathtubs, showers and kitchens

But installing a thermostatic mixer in the kitchen is not always justified. This is due to the fact that you constantly need to change the temperature depending on the activity. For cooking you need cold water, wash your food with warm water and your dishes with hot water. Constant temperature fluctuations will adversely affect the efficiency of the device. And in this case, its value is minimized.

Types of faucets with a thermostat for bath and shower

Thermostatic washbasin mixer is fully capable of coping with the task in terms of maintaining the water temperature in the set mode. The vertical model with a spout can be installed on the sink or wall. The construction of the thermostatic mixer for bath and shower includes a spout and a spout. Such a device is made mainly of brass with a chrome coating.

Useful tip! For showers, you can install a universal thermal mixer with a long spout or a model of cascade type, which provides the ejection of water flow in a wide band.

Thermostatically controlled shower mixer with shower head. The option is convenient to use and installed in a hidden way. The head and temperature regulators remain visible, while the rest of the mechanism is hidden in the wall.

Thermostatic bath and shower mixers consist of a watering can and a spout

For showers it is possible to install a push-button version of a thermostatic mixer. To get the device to work, you need to press the big button. Water will flow for a while, after which it will stop.

Depending on the method of installation, thermostatic faucets are horizontal, vertical, floor-mounted, wall-mounted, flush-mounted and variants that are attached to the edge of the sanitary device. Recessed thermostatic faucets look similar to shower faucets. They differ in that they have a specific tank for installation in the wall.

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What is the best way to choose a mixer with a thermostat: materials for manufacturing

When choosing a high-quality and durable thermostatic bath mixer, it is important to consider some points. The first thing to pay attention to is the body material. Ceramic, plastic or metal can be used here. Ceramic products have an attractive appearance, but are characterized by poor durability, susceptibility to mechanical stress. This is due to the fragility of the material, which is noted in the reviews. Faucets with a thermostat made of ceramic are relatively expensive.

Ceramic faucets with a graphite coating are the most reliable

Thermostatic bath mixers with metal casings can be made of gunmetal, brass or copper. Such products are quite reliable, strong and durable. The main disadvantages of metal faucets include their high cost. There are cheaper models made of a metal alloy. silumin. However, they are not durable, as evidenced by numerous reviews. Bathtub faucet with thermostat made of plastic is the most affordable option, but is characterized by the shortest service life.

You should also pay attention to the material from which the valve cartridge for the thermostatic mixer is made. It can be leather, rubber or ceramic. The first two options are characterized by low cost, but they are less resistant and durable. Such gaskets will quickly deteriorate if solid particles come in with water.

Ceramic valve is more reliable. It is capable of pushing out solid particles that have entered its body. Such an element has a graphite coating, which prolongs its service life. However, due to the brittle nature of the material, the valve must be turned in until it stops, taking great care to avoid damaging the integrity of the head.

Faucets with a thermostat are made of ceramic, plastic or metal

Choosing Tips

The main thing is to determine at once how much money can be allocated for the purchase of a mixer. You can’t count on much savings when choosing a high-quality mixer. Inexpensive models, even if they look good, can deteriorate quickly. The next important point is to evaluate the product to match the interior.

All other things being equal, you should give preference to products with a long warranty.

Faucets made of good materials need to be heavy. Lightweight models are often not of sufficient quality. If the mixing unit is equipped with a long spout, it will take up quite a lot of space, which is unlikely to please owners of small apartments. When the bathtub (shower cabin) and the sink are close, you can get by with a 0.3 m long faucet. But if there is a long distance between them, it is better to use 2 separate taps.

The long spout works well only when equipped with a secure lock nut. But in models of the budget class it is rarely made of good quality materials. And even high-quality versions will last less than a short spout. It makes no sense to overpay for a foreign brand, but if you have money, you should buy world-class products. And as in other cases, it is necessary to study the reviews for a particular model.

How to independently install a thermostatic faucet in the bathroom, see the video below.

What is it and what is it for??

The thermostatic faucet not only differs from others with its futuristic design Unlike a regular faucet, it mixes hot and cold water, and it keeps the desired temperature at a predetermined level.

In addition, in multi-storey buildings (because of the uneven water supply) is not always possible to optimally adjust the water jet pressure. A faucet with a thermostatic regulator also takes care of this function.

Controllable water flow is needed for a variety of purposes, so the thermostatic mixer is used with equal success for:

The thermostatic mixer can be attached directly to the plumbing fixture or to the wall, which makes it more functional and ergonomic.

Thermostats are increasingly used not only in the bath and washbasin: thermostats control the temperature of the underfloor heating, and are even designed for outdoor use (pipe heating, combined with snow melting systems, and so on).


A thermostatic faucet will solve the problem of difficult to regulate the water temperature, bring it to a comfortable temperature and hold it at this level. That is why this device is especially important for families with small children or elderly people. Relevant will be such a unit and in places of residence of people with disabilities or severely ill.

We can highlight the main advantages of the thermostat.

  • First of all safety. Any adult will not be happy if while taking a shower is poured on him boiling or icy water. For people who find it difficult to react immediately in such a situation (the disabled, the elderly, young children) a device with a thermostat becomes essential. It is also very important for small children, who do not stop exploring for a minute, not to let the metal base of the mixer get hot during the bath.
  • Hence the next advantage. relaxation and comfort. Compare the benefits of simply lying in the tub and enjoying your bath or turning the tap every 5 minutes to adjust the temperature.
  • The thermostat saves energy and water. You don’t have to waste cubic meters of water waiting for it to heat up to a comfortable temperature. Electricity is saved by connecting the thermostatic mixer to a stand-alone hot water system.

A few more reasons to install a thermostat:

  • Electronic models with displays are very easy to control, they regulate the water temperature smoothly;
  • faucets are safe to use, and they are easy to install with your own hands.

A significant disadvantage of “smart” faucets is their cost, which is several times higher than conventional faucets. But if you spend only once, you can get much more in return. comfort, economy and safety.

Another important nuance. almost all thermostatic faucets depend on the water pressure in both pipes (with hot and cold water). If there is no water in one of them, the valve will prevent water from flowing from the other. Some models have a special switch that makes it possible to open the valve and use the available water.

Add to this the possible difficulties with the repair of such faucets, because not everywhere there are certified service centers that can cope with the breakage.

How the mixer works?

Inside the body of the thermostatic mixer there is a mixing valve, controlled by a cartridge (cartridge). a device that allows you to maintain a constant temperature of the mixed water flow regardless of pressure fluctuations in the water system. It contains wax inside, or (more commonly) consists of bimetallic plates that are sensitive to temperature variations in water flow. As soon as the water gets a little colder or hotter, the cartridge reacts by compression or expansion and changes the flow ratio, restoring the set temperature.

The springs, pistons, bimetallic plates, and valve channels are selected so that a wide range of water pressures can maintain the same temperature at the mixer outlet. If there is a sudden drop in pressure in the system you will feel only a change in pressure, the water temperature will not change. This will not happen, and if you suddenly turn off and then turn on the water while taking a shower. the mixer immediately gives you water at a comfortable temperature.

The “talking” symbols on the surface of the thermostat show you which levers are responsible for the intensity of the pressure, and which ones for the temperature. This option makes it quick, precise and easy to set a comfortable flow. You select from a range of temperatures indicated on the scale a comfortable temperature for your body (the optimal temperature is 38 ˚C). The temperature selection knob is equipped with a safety stopper, which protects against burns. As long as you do not activate the stop button, you can only reset the temperature. The mixer has been designed to prevent the body from being heated by the flowing hot water: you will not get burned if you touch it.

Thermostats Grohe, hansgrohe, Ideal Standard, Oras, Jacob Delafon, Kludi, Roca can work in economy mode, reducing water consumption by up to 50%.

Thermostatic mixer included in the Grohtherm 3000 Cosmopolitan shower stand kit (from 33 090 ).

The thermostat reacts to any variations in water pressure, so you can enjoy your shower knowing that the water temperature will remain constant throughout the entire duration of the shower.

Where best to install a thermostat?

You can add a thermostat to your kitchen sink, washbasin or bidet. In the kitchen, the thermostat is not in demand. you need to constantly change the water temperature. And frequent resetting of the thermostat is not recommended.

The thermostat is most relevant in the bathtub/shower or shower enclosure. Especially when there are outlets from the same supply pipe to the shower, washing machine and kitchen. And if the washing machine or dishwasher turns the intake of cold water and the pressure in the pipe decreases, the thermostat reacts to changes in temperature and equalizes the flow ratio.

Thermostats are made in different modifications. Thermostat models for shower enclosures do not feature a spout.

How to choose: recommendations

Quality, functionality and safety of use can only be guaranteed by original thermostats from manufacturers. It is therefore important to buy the device from a specialist retailer and have the retailer provide you with the applicable certificates.

It is important to clarify the specifics of the plumbing in advance, since this is directly linked to the type of installation of the unit.

Choosing between an electronic and mechanical device, remember that the latter is more reliable. However, the electronic version provides a more comfortable use and also allows to take advantage of additional options.

An important selection criterion is the type of valve seat material. The best choice are ceramic parts with graphite coatings. Ceramic valves, however, do not tolerate too rough a closure by force. Turning the valve as far as it will go is sufficient.

choose, mixer, thermostat

Leather and rubber analogues can attract a lower cost of the product, but they wear out quickly. However, the seats can easily be replaced if they fail. The process is similar to that of replacing a gasket in an ordinary faucet.

Regardless of the valve material, it is recommended to purchase a deep strainer for the pressure line. Its use will extend the life of the thermostat.

It is important that the selected unit has a safety button. Its purpose is to prevent unintentional changes in water temperature. Usually the button is painted in a signal red color. You can change the temperature of the water in the thermostat, after first releasing the safety function. This element is indispensable in families with children.

Installation: parts

When connecting the thermostat, it is important that the appropriate cold and hot water hoses are connected to the correct pipes. There is a special marking on the thermostat for this purpose. Otherwise the product will not function properly and will fail in a short time.

It is unacceptable to mount a modern thermostat on obsolete plumbing from Soviet times. This is due to the fact that the cold water outlet in the latter is on the left, and in European countries it is on the right. Modern thermostats are designed for European style plumbing. In other words, if you want to install a device on an obsolete sewage system will have to change the layout of the plumbing.

However, if you choose wall-mounted horizontal mixers with a thermostat, you will only need to swap the supply hoses. This does not apply to the recessed unit, it will not fit on outdated designs. It is optimal to match the built-in thermostat with sanitary fixtures of the same brand.

As already mentioned, to prevent pollution of the thermostat elements will allow the installation of filters. To avoid incorrect operation of the device due to water hammer (pressure drop) allows the installation of reducers. They are mounted at the water inlet point and adjusted based on the readings of the thermostat.

A step by step guide to installing the Grohe thermostatic bath mixer awaits you in the following video.



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