Connecting a thermostat to an indirect heating boiler

Here you will learn:

Indirect heating boilers are actively used in everyday life as productive devices for convenient and safe preparation of hot water. Using heat from traditional heating pipes for power, they are economical. Connecting an indirect heating boiler is carried out using several schemes described in this review - we will consider both complex and simple schemes. At the same time, we’ll figure out how to make the electrical connection of this unit.

Indirect heating boiler design

Electric storage water heaters are gradually becoming more common sources of hot water, using a regular household electrical network for power. They are equipped with conventional heating elements responsible for heating water in the internal tanks. Electricity costs are not the highest, but not the lowest either - the larger the boiler, the higher the consumption. But in the world of water heaters, there is also a more economical technique.

Indirect heating boilers use heat extracted from heating systems to heat hot water. To do this, they are equipped with metal coils. Having a large area, they quickly heat the water to the temperature set on the panel. The temperature regime is maintained through built-in or connected automation.

The scheme for organizing a DHW circuit using capacious wall-mounted and floor-mounted indirectly heated boilers has the following advantages:

• Saving on electricity – in winter it will be noticeable;
• Fast preparation of hot water - “indirect” ones are characterized by high productivity;
• High reliability - many experts tend to use this particular scheme rather than double-circuit boilers.

The scheme is really simple and reliable, all that remains is to select and connect the indirect heating boiler to the heating system. Let's see how to connect.

How to connect an indirect heating boiler to a single-circuit boiler

The best position is when the bottom of the hot water tank is higher than the heating boiler and radiators. With coolant recirculation If there is a water heated towel rail in the system, constant circulation of water through it is necessary. In order for the system to function normally, an accurate calculation of the pump for the indirect heating boiler is necessary. There are several ways.

Small tanks with a volume of no more than 15 liters are equipped, as a rule, with one heating element with a power of 1.0 kW. This heating element comes into direct contact with water, as a result of which scale forms on it, which must be removed.

Installation methods and shapes of boilers Boilers come in wall and floor versions, horizontal or vertical models. Therefore, the water takes a long time to heat up.

The hot walls of the coil transfer heat to cold water, which at the outlet already has a temperature suitable for taking a shower or washing dishes. Control your blood pressure.

At this point the installation can be considered complete. The heating rate depends entirely on the power of the unit and its volume. Indirect heating boiler

Basic connection diagrams

In our review we will look at several of the most popular schemes for connecting indirect heating boilers to heating equipment. They differ in their degree of complexity, so you have to choose the best option.

Connection without regulation

This scheme is characterized by maximum simplicity, but is practically not used in hot water supply systems. Yes, we can safely connect an indirect heating boiler to a gas boiler without additional wiring. But you will have to somehow put up with the lack of ability to adjust the temperature to your liking. In fact, the temperature of the water in the tank with this connection scheme depends on the temperature of the coolant at the connection point.

Remember that the maximum water temperature in the tank of an indirectly heated boiler (water heater) is only a couple of degrees lower than the temperature in the heating circuit.

In some cases, the coolant (water) in heating systems warms up to high temperatures, up to +70-80 degrees. More impressive indicators are also recorded. Such powerful heating leads to the fact that the temperature of the water in water heaters jumps to similar levels. We open the tap, and our hands are scalded with almost boiling water. Agree that such a connection is not safe, even if you dilute the water with a mixer.

Thus, the connection diagram for an indirect heating boiler must necessarily contain regulatory elements. Temperature stability at the outlet will allow you to avoid problems with scalding your hands and other parts of the body. Moreover, most connection methods are relatively simple.

Connection with circulation pump

Connecting an indirect heating boiler to a single-circuit boiler using a low-noise “wet” type circulation pump is one of the simplest schemes. It uses the following nodes:

• Circulation pump – provides a forced supply of coolant into the inside of the water heater (into the tank);
• Thermostat for an indirect heating boiler - built-in or external;
• Check valve - prevents the reverse flow of coolant and stops circulation when the pump is turned off.

Let's take the simplest case, when the water heater already has automation. To carry out the installation, we will need an indirect heating boiler piping, which includes the following elements - a tap for quick disconnection from the heating network, a circulation pump, a check valve, a tap for shutting off the water supply, a check valve for the water supply.

We begin connection work - we install our indirect heating boiler in a given location (floor or wall mounting). Next, we lead the pipe to the heating system and connect through the tap. We install a circulation pump at the outlet of the water heater, and after it we install a check valve.

This method involves installing another “wet” type circulation pump into the home heating system.

Connection with three-way valve

A gas boiler with an indirect heating boiler is a simple and reliable combination for organizing a durable and productive hot water circuit. To connect a water heater, we can use one simple circuit using a three-way valve. It will play here approximately the same role as in a conventional double-circuit boiler - there it switches the movement of the coolant from the heating circuit to the secondary heat exchanger, in which the water is heated (when the tap is opened).

It works in a similar way here. To organize the connection, we will need a three-way valve, a low-power circulation pump and the indirect heating boiler itself. The circulation pump is common here; it circulates the coolant through the heating circuit and through the water heater. This process is controlled by a three-way valve connected to the thermostat. As soon as the temperature in the tank drops below normal, the valve switches and water heating in the DHW circuit begins.

Storage water heaters

What does a storage boiler consist of?

• the heater body itself (made of metal, plastic, or a combination);
• thermal insulation (due to which heated water remains warm for a long time);
• a water container covered with waterproof material - enamel, stainless steel, etc.;
• magnesium anode, which protects the tank from corrosion (if the anode is replaced in a timely manner, the tank will last much longer);
• heating element, abbreviated as heating element (directly that part of the boiler that heats up; for inexperienced buyers, it can be noted that in appearance it resembles the spiral of a boiler);
• thermostat (responsible for controlling the water heating temperature);
• safety valve (protects against excess pressure inside the tank, releasing air if there is excess).

Boiler temperature sensor for gas boiler Clas System

The thermostat in a water heater is one of the most important components, since it not only controls the heating and cooling of water, but is also responsible for safety when using boilers, turning off the thermostat if excessive steam formation occurs when the water in the boiler overheats.

In many sources it is called not just a “thermostat”, but a protective thermostat, and it fully lives up to its name, helping to regulate temperature and pressure, which allows you to avoid many unpleasant or even dangerous consequences.

How to choose the right connection

An indirect heating boiler can even be connected to a double-circuit boiler, if this makes sense - for example, such a scheme will allow you to connect multiple water points and use them simultaneously. Here we select any available scheme. In the absence of heated floors and several heating circuits, the optimal solution would be to connect through a circulation pump or a three-way valve.

If you need to create a connection diagram for a solid fuel boiler that runs on wood, we recommend choosing the option shown in the picture below. Here the priority of the indirect heating boiler is used. The coolant for heating devices is taken from its outlet. This connection reduces the thermal load on the radiators and ensures a reliable supply of hot water.

Connection through hydraulic arrows and collectors is used if it is necessary to provide heat and hot water to a building of impressive size. For example, it could be a two- or three-story cottage. In this case, a powerful boiler is installed in the system, and distribution equipment is connected to it.

Connecting an indirect heating boiler to a single-circuit boiler - diagram

According to the diagram, you need to find the terminals for the boiler sensor in the boiler and connect the ends of the wires to them.

Conventional indirect heating boilers work mainly with automated boilers.

Connecting the boiler to the boiler using a three-way valve This connection diagram is perfect for gas boilers equipped with a circulation pump and automation. Preference is given to wall-mounted models that can be hung at a height of 1 m above the floor.

The best position is when the bottom of the hot water tank is higher than the heating boiler and radiators. How to properly connect an indirect heating boiler to a heating system? They are less often connected to free-standing boilers of similar volume.

More on the topic: How to connect a two-key switch

Indirect heating boiler design

Indirect heating These water heaters do not produce thermal energy themselves. If you need to create a connection diagram for a solid fuel boiler that runs on wood, we recommend choosing the option shown in the picture below. Some manufacturers deliberately produce equipment with standard dimensions of connectors and fittings.

In this scheme there is no three-way valve; the circuit is connected through ordinary tees. With this part, the unit lasts much longer. Operating at very high temperatures can cause premature damage to the inside of the tank. Types of double-circuit gas boilers with a built-in boiler, are they needed? Boilers are used in conjunction with single- and double-circuit gas boilers. The circulation pump is common here; it circulates the coolant through the heating circuit and through the water heater.

How to connect an indirect heating boiler (water heater)

Scheme for connecting an indirect heating water heater to a gravity system When implementing this scheme, the circuit that goes to the water heater is made into a pipe with a diameter 1 step larger than the heating one. They have a coil and a built-in heating element.

This piping method is useful for those who use the boiler in constant mode 2: Option with two circulation pumps If the boiler is used rarely, for example, seasonally or on weekends, or there is a need for water whose temperature is lower than in the heating system, use a scheme with two circulation pumps . The heating system of an apartment or house is working, and the water in the boiler is heating up as if in passing as a side effect. A boiler connected to heating equipment and electric heating elements. This method is only possible if you have separate boiler equipment that can operate from natural heating sources in the form of liquefied gas, coal or firewood all year round. The hot water supply circuit also has higher priority over the heating circuit, but this is achieved only by adjusting the switching algorithm. Performing piping requires preliminary competent thermal calculations. Ufa. Connection diagram for an indirect heating boiler.

Electrical connection

During the warm season, the equipment is turned off, so you need to somehow solve the problem with hot water. To do this, we can shut off the heating circuit and leave only the indirect heating boiler running. But most often the practice is to simply connect the water heater to the electrical network - for this purpose, heating elements are installed here (in some models they are built-in initially). It is necessary to connect to the electrical network through circuit breakers.

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Connecting pump thermostats and indirect heating boiler

Connecting pump thermostats and indirect heating boiler

Post by Roman13vs777 » Jan 27, 2015, 9:11 pm

Re: Connecting thermostats for pumps and an indirect heating boiler

Post by Bahus » Jan 27, 2015, 10:22 pm

Re: Connecting thermostats for pumps and an indirect heating boiler

Post by Guest » Jan 27, 2015, 11:41 pm

Re: Connecting thermostats for pumps and an indirect heating boiler

Post by BAXI-Ural » 28 Jan 2015, 08:34

Re: Connecting thermostats for pumps and an indirect heating boiler

Post by Bahus » Jan 28, 2015, 10:30 am

Re: Connecting thermostats for pumps and an indirect heating boiler

Post by Roman13vs777 » Jan 28, 2015, 9:05 pm

I suggest continuing to those who are interested and who are engaged in self-development (from the institute I have a passion as an engineer for technical puzzles). I reviewed the schemes, well, a lot of them, I especially liked the resource eurosantechnik.ru and the execution by Vitaly Luzhetsky, for anyone interested, here is the link

There is absolutely no time to draw or draw a diagram. I don’t want to post a photo of a diagram from a notebook in pencil. And why draw everything in the standard way: boiler-arrow-distribution manifold-supply to the circuit-pump-heat exchanger-return-manifold-arrow-boiler. To make the concept easier, I omitted all the taps, filters, and valves. Based on your feedback, I understand that your opinion is that it is better to let the system operate according to the VT temperature, but with so many zones the needle will not cool down.

The discussion boils down to narrowing down the questions: 1) Is it possible to connect a pump to the thermostat and a thermostat to the boiler at the same time? 2) How will the boiler react if a DHW priority sensor is connected to it? What will happen without a three-way valve. Or it's not possible at all. 3) “tuning” was written in quotation marks. "3.5. TECHNICAL NOTES: The AFR system improves the operating and combustion characteristics of the boiler." Does the “slingshot” also improve or is there no point?

The design and principle of operation of the boiler

An indirect exchange boiler (water heater) is a tank filled with water in which a heat exchanger is located. A coil or water jacket is usually used as a heat exchanger. The heat exchanger is connected to a heat source that transfers energy through a coolant.

The process of heating water in the boiler occurs as follows:

• First, coolant from the heating boiler is supplied to the heat exchanger;
• The walls of the heat exchanger are heated by the supplied energy;
• Heat is transferred from the walls to the water located in the tank;
• Heated water is taken by consumers as needed.

With this technology, there is an intermediate link between the water and the coolant, which ensures heat transfer - that’s why the device is called an indirect heating boiler.

The heating system with an indirect heating boiler is in close cooperation. Thus, the water in the boiler usually has a slightly lower temperature compared to the temperature of the coolant entering the heat exchanger - that is, the water in the tank can only be heated to the level that the boiler is capable of producing.

However, there is one way to bypass this limitation - all you need is to choose a combined boiler, which, in addition to the heat exchanger, also has a heating element. In such devices, the main source of heat is indirect heating, and the heating element increases the water temperature to the required level. The most effective combination of equipment, in which the water remains hot the longest, is a boiler with a heating element and a solid fuel boiler.

Some boiler models are equipped with additional heat exchangers - with a large tank volume this will significantly speed up the heating of the water. To ensure that the water remains heated for as long as possible, when choosing equipment you should give preference to devices with insulation.

How to choose a three-way valve for a private home heating system

Now you know for what purposes certain types of valves are used. But this is not the only selection criterion, because the valves have several ways of regulating the temperature and different throughputs. Yes, and the material of manufacture may differ. Let's look at this in more detail.

Temperature control method

Let's start with manual adjustment. Here the rod is connected to a valve or handle; under them there are marks, with the help of which the temperature is regulated. This is the simplest and cheapest method, so some consider it more reliable. But I believe that it all depends on the company: if the valve is of high quality, then with automatic adjustment it will work no less than with manual adjustment.

If a thermostat is built into the design, such a valve is called thermostatic. Usually it is configured only once. Then he himself selects the position of the rod based on temperature fluctuations. A heat-sensitive liquid or gas is responsible for this: when the temperature rises, they expand and begin to move the rod. Such valves are either electronic or mechanical. A three-way valve with a thermostat is much more convenient than a manual one, since it operates automatically, but it also costs more.

Three-way valves with electric drive are considered the most accurate. They have a built-in thermostat, but control occurs using an electronic unit that operates on a servo drive. When the temperature changes, the thermostat sends a signal to the controller. And now he controls the drive, raising or lowering the rod.

I think it's better to go with the middle option. Manual adjustment is inconvenient, and the motorized valve is expensive. And such precision is rarely required in everyday life.

Material of manufacture

The durability of the product depends on the material used to make the case. I want to say right away that sometimes there are valves made of silumin. Although they are much cheaper, I do not recommend paying attention to them. And there are many other reliable materials:

1. Black carbon steel valves are durable and relatively inexpensive. Unfortunately, they are susceptible to corrosion, so they are usually plated with nickel or chrome. Stainless steel is also often used, but such products are more expensive.
2. Cast iron is strong, durable and does not corrode. But usually these are old-style valves, since more advanced materials are now used.
3. The most popular are products made of brass and bronze. These are durable, strong and stainless materials. They cannot be used in industrial conditions where temperatures exceed 200 degrees, but they are ideal for domestic needs. I advise you to choose just such three-way valves; if the material is not indicated in the characteristics, it can always be identified by its characteristic color and texture.

Compatibility with heating equipment

Indirect heating boilers work without problems with any heating system that supplies hot water - as long as its power is sufficient. As noted above, solid fuel boilers that operate on all available types of fuel are an excellent option. However, devices running on gas, electricity or liquid fuel will also be quite effective.

The installation of the tank itself is not very complicated, but the connection diagram for an indirect heating boiler is no different in simplicity. When choosing a model with controls, there will be no special problems, but with simplified products you will have to tinker so that the boiler working in conjunction with them can work with both heating and water supply.

Types of indirect heating boilers

The classification of water heaters of the type under consideration is carried out according to one main feature - the presence or absence of built-in control:

1. Boilers with built-in control . Such devices are connected to heating systems that use boilers that are not equipped with automation. Such boilers have a temperature sensor and their own automation unit, which regulates the supply of heated water to the heat exchanger. Connecting an indirect heating boiler with built-in control is simple - you just need to connect the supply and return pipes from the boiler to it, provide a supply of cold water and connect an output channel that allows you to distribute water to consumers.
2. Boilers without built-in control . As a rule, this category of boilers usually works in conjunction with automated boilers. Piping a boiler of this type begins with installing a temperature sensor and connecting it to a suitable boiler input. Next, the boiler is connected according to one of the existing schemes. If necessary, such devices are connected to non-volatile boilers, but in this case it is necessary to use the appropriate wiring diagrams.

Boilers are also divided into types depending on their shape and installation method. As for the latter, there are two types of devices - wall-mounted (volume no more than 200 liters) and floor-mounted (volume up to 1500 liters). Both options can be in horizontal or vertical format. Wall-mounted boilers are mounted on brackets fixed with dowels.

The vast majority of water heaters are cylindrical in shape, and their outlet pipes are located on the back - this greatly simplifies the connection of an indirect heating boiler and does not spoil the decorative qualities of the structure. On the outside of the panel there is space for installing a temperature sensor or relay, and some models have the ability to connect a heating element.

Examples of popular connection diagrams for a single-circuit gas boiler with an indirect heating boiler

They are less often connected to free-standing boilers of similar volume. Using a thermostatic head with a built-in sensor, the water temperature for the boiler can be set no higher than the coolant temperature. Various boiler piping schemes There are several main ways of piping the device, which are: With two circular pumps Both pumps are designed for parallel operation. In normal mode, the top layer of water in the tank is used first, which is hotter.

We have already mentioned the three-way valve.

The heated water is used for household needs as needed. General requirements In order for the piping system of a single-circuit boiler with a boiler to work normally, without interruptions and emergency situations, the following requirements must be met: At the outlet of the boiler, an expansion tank with a volume of at least 10 percent of the boiler is installed.

The boiler is connected to an indirect heating boiler as follows: A three-way valve is installed near the circulation pump. Internal coating of the tank In cheap boilers, the internal coating of the tank is made of enamel or glass ceramics.

Of stainless steel. Many single-circuit gas boilers have a summer operating mode, which will allow you not to work on the heating system, but to provide heating for the indirect heating boiler. In both cases there are horizontal and vertical models. In this case, the boiler electronics know about the temperature of the water in the DHW system, and it decides where to direct its power: to heat water in the BKN or for heating.

The boiler is designed in such a way that when water is consumed, it is filled with a new portion, and the process continues. The water in the tank can be heated using connected solar heating systems or heat pumps. Remember to set the thermostat correctly!

How to avoid these shortcomings? They differ in their degree of complexity, so you have to choose the best option. That is, in this case, it is desirable to install wall-mounted models. Ideally, the bottom of the indirect water heater is located above the boiler and radiators. Indirect heating boiler device, operating principle and connection diagrams

Connection diagrams and features

The indirect connection can be carried out according to two basic schemes:

• In the first scheme, the water supply circuit will be a priority for the system;
• In the second scheme, water is heated in accordance with the operating mode of the heating equipment.

The first scheme of a heating system with an indirect heating boiler directs the entire volume of coolant to warm up the tank, which ensures very fast heating of water. When the water temperature reaches a set point, the coolant is redirected to the heating circuit.

The second scheme for piping an indirect heating boiler does not distinguish between heating and water supply, therefore only a certain part of the coolant is given to the latter. Accordingly, no drop in heat transfer from the radiators is observed, but the water in the boiler heats up much more slowly than in the previous case.

When installing an indirect type water heater, it would be better to give preference to the first scheme - it ensures an uninterrupted supply of hot water in the required volume. In this case, the heating efficiency will practically not deteriorate - to maintain the temperature regime, the coolant is removed from the heating circuit for about 5 minutes, and it will take about half an hour to fully heat the entire tank.

Of course, these figures are very approximate - the heating speed directly depends on the power of the boiler and the volume of the tank. One thing is for sure - if the power of the heating equipment exceeds the required level by at least a quarter, then it will take very little time to heat the water, and these costs will not affect the heating efficiency. In any case, before connecting the indirect heating tank to the boiler, you need to think through all aspects and calculate the efficiency of the future system.

How to check a three-way valve for functionality

First of all, an external inspection should be carried out: there should be no cracks in the plastic and metal casing. As for the regulator, it should turn smoothly in all directions. To check the thermal head, it needs to be heated. For example, a hair dryer. In this case, the rod should move in accordance with the indicators. If the valve has an electric drive installed, you can check its functionality using a tester, but to do this you will have to disassemble the electric drive.

Three-way valves only resemble a tee in appearance. Their design is much more complex, and their applications are quite diverse. Choose a valve responsibly; consider only models from well-known, reputable manufacturers; fortunately, there are plenty of them. And then this small but very important device will work for many years without causing problems.

Source

Boiler piping rules

There are a number of general rules that must be followed when installing indirect heating boilers:

1. So that all devices connected to the hot water supply can function normally, an expansion tank is supplied to the boiler output channel, the volume of which is equal to 10% of the total volume of the tank. The installed tank will compensate for thermal expansion in the plumbing system.
2. Each branch of the system must be equipped with a ball valve, which will allow, if necessary, to turn off any device without turning off the entire water supply circuit.
3. It is strongly recommended to equip supply pipes with check valves. These elements prevent water from flowing back into the boiler and thus ensure its safe use.

Connecting the boiler to a boiler with forced circulation of liquid

If a circulation pump is installed at the system supply, and there is a place near the boiler to install a boiler, then the best option would be to organize a separate circuit coming from the heating boiler. As a rule, such a heating scheme with an indirect heating boiler is used for wall-mounted boilers - in this case, a parallel connection of the water heater and the heating circuit is obtained.

Behind the circulation pump, you need to install a three-way valve for an indirect heating boiler, to which a temperature sensor installed on the tank is connected. The output of the three-way valve is connected to the boiler pipe so that the circuit can be connected to the heating. A tee is cut into the return pipe in the area before the boiler entrance, designed to draw water from the heat exchanger.

The workflow with this scheme looks like this:

• When the three-way valve receives data that the water temperature has dropped below the required level, the entire coolant is redirected to the boiler;
• The water in the boiler is heated by the coolant that gets into it;
• When the water temperature reaches a predetermined upper level, the three-way valve switches again and the coolant again enters the heating system.

Types of thermostats

Of the many types of thermostats, the three most common are:

1. core. The oldest among all thermostats presented to the buyer today. It is a tube that, when heated, expands and puts pressure on the switch, and when cooled, it contracts and turns off the heater. This type has a significant drawback. To maintain a constant water level in the boiler, cold water is constantly supplied to it, replacing the hot water that is drained. The thermostat is located too close to the place through which water enters the tank, because of this it is constantly cooled, as a result of which there is constant heating, and the device works almost without stopping;
2. capillary thermostat. A thin tube with liquid extends from the regulator, which changes the structure when the water is heated, due to which the automatic shutdown was triggered (the liquid in the capsule expands and presses on the membrane, which opens the contacts). Accordingly, the reverse process occurred when the water was cooled, giving a command to turn on the heater;
3. electronic. Another modern type of protective thermostat, along with the capillary one. For better functioning, this type of thermostat interacts with a safety valve (relay), which allows you to turn off the system when the tank is empty. From a security point of view, this is definitely the best option.

Scheme with two circulation pumps

If the system is already equipped with a circulation pump, then the boiler piping circuit may include another pump, which will be located exactly on the pipeline on which the tank is located. The location of the pump relative to the boiler itself does not matter - it can be installed both on the supply and on the return.

There is no three-way valve in this diagram - the indirect heating boiler is connected using tees. To regulate the supply of coolant to the boiler, pumps are used, the activity of which is controlled by a temperature sensor - at low temperatures, the circulation pump for the indirect heating boiler starts, and after heating, the second pump begins to operate, ensuring the circulation of liquid in the heating system.

Connecting the boiler to a non-volatile boiler

When used with non-volatile heating equipment, the boiler must be provided with priority supply of coolant. The easiest way to achieve this goal is to install the tank above the level of the radiators - which is why wall-mounted models are usually used in such situations. The optimal location of a wall-mounted boiler assumes that its lower part is located at least slightly above the level of the boiler and heating devices.

Of course, such a water heater piping can also work with floor-standing devices, but heating of the water will be slow and incomplete. At the bottom of the tank, the water will not be able to warm up completely (its temperature will be at the same level as the temperature of the liquid in the return pipeline), so the total volume of hot water will be reduced.

Coolant circulation in non-volatile systems occurs naturally. To increase the efficiency of the system, you can embed a circulation pump into it, and if electricity is available, the water will be constantly heated. If desired, you can do without a pump - for normal supply of coolant to the water heater, the supply pipes to it must have an increased diameter compared to the heating circuit pipes.

A thermostatic head equipped with a sensor is installed in the section of the heating pipeline behind the branch. This thermostat allows you to set the desired temperature. The supply of coolant is regulated by a thermostat, which opens and closes depending on the temperature of the water in the tank.

Checking the Thermostat

Taras Kalenyuk

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Even the best quality water heaters sometimes break down. If this happens before the expiration of the warranty period, you should contact a specialized service center. If the warranty has already expired, it is better to entrust the diagnosis and repair to a professional. But if you have certain skills and the necessary equipment, it is possible to independently diagnose the thermostat. What will you need for this? First, a multimeter (combined electrical measuring instrument).

Before removing the spare part from the water heater, you must:

1. completely de-energize it;
2. shut off the cold water pipe;
3. drain the water from the tank.

Next, you need to disconnect the thermostat sensor and “ring” it using a multimeter. If the circuit is working properly, we proceed to checking the automation. To do this, you need to dip the thermostat sensor in a simple pan of water. We are waiting for heating to the desired temperature and, if the automation is working properly, you will hear a click, and the multimeter will show that a pair of thermostat terminals is open.

If the thermostat still turns out to be faulty, you need to purchase a similar one to replace it. To do this, you must present the technical passport to the seller so that he can select the appropriate model.

We recommend to buy

Scheme with coolant recirculation

If there are additional consumers in the system (for example, a device for drying towels), you need to arrange it so that they all receive hot water. For this, a recirculation loop is used, in which water is constantly circulated throughout the entire circuit by a pump. Connecting an indirect heating boiler with recirculation has an important advantage, which is that heated water constantly flows from the tap, and no time is wasted on cold water draining.

The disadvantage is that when the coolant is recirculated, the cost of heating the water in the boiler increases. The thing is that the liquid constantly circulates around the ring and cools, so the boiler spends much more resources on constantly heating it. In addition, the temperature reduction is enhanced by mixing different layers of liquid.

Arranging a recirculation system can be done in several ways. The simplest of them is to choose a water heater that has a built-in recirculation circuit, implemented in the form of additional pipes. Of course, an indirect heating boiler with recirculation is much more expensive than conventional models. Another option is to combine all consumers into one circuit using tees.

Conclusion

The connection of a single-circuit boiler with an indirect heating boiler is carried out according to different schemes, each of which allows you to solve a certain number of problems. In order for the hot water supply to work efficiently and without interruptions, you need to think in advance about its design features and nuances that may arise during operation.