Does the stabilizer for the boiler is necessary?

The best voltage regulators for gas boilers

does, stabilizer, boiler, necessary

In the private sector power surges are not uncommon. Their high value can disable the electronics of the gas boiler, and low values contribute to the shutdown of equipment and stop the heating. Rating voltage regulators for gas boilers, made with the characteristics of devices and user reviews will help you choose a model that provides trouble-free operation of heating equipment.

Selection of products made on the basis of reviews, opinions and ratings of users, posted on various Internet resources. All information was taken from public sources. We do not cooperate with manufacturers and brands and do not encourage the purchase of certain products. The article is for informational purposes.

What voltage regulator is necessary for the boiler by design?

The gas boiler is suitable for wall-mounted and floor-mounted units. The purchase of rack-mounted models is not practical. They imply a special, almost not used in the household 19-inch design and are characterized by high power, far exceeding the needs of the electrical circuit of the boiler.

The choice of connection method of the AVR for the boiler depends on the place of installation of the appliance. Consider in advance which mounting of the device is convenient in your case vertical or horizontal.

Type of UPS architecture

Equipment with batteries is divided into three types according to the architecture of performance:

  • Offline. Functions without a built-in regulator, so as soon as the mains performance becomes unacceptable, switch to battery operation. With frequent changes in input current parameters, the battery will be used regularly and will discharge quickly.
  • Online. Has an increased number of batteries and performs double current conversion. The battery is constantly recharged and the boiler receives voltage from the battery, with a conversion of 36 VDC to 220 VAC. Optimal for boiler equipment, but it is expensive.
  • Line-interactive. At the same time there is a feeding of the battery and supply voltage to the boiler with the equalization of the indicator to 220 V. Sufficient accuracy of output voltage and average price.

Stabilizer: to use or not

Often homeowners with installed gas equipment are not fully aware of why they need a voltage regulator for the gas boiler. The main arguments are supposedly complete protection and reliability of modern devices, the stable operation of power systems. In this regard, the purchase of the stabilizer refers to the unreasonable costs.

However, such statements are only partially justified. In any case, the delicate electronics of control units and settings require a stable voltage, and at the same time, there is no complete guarantee and insurance against significant voltage fluctuations. Quite often the permissible limits are exceeded, causing failure of expensive equipment.

What arguments can be made in favor of voltage stabilizers:

  • The amount of household appliances and equipment is constantly increasing, and transformer stations and power lines cannot cope with the growing loads. As a result, voltage spikes or, on the contrary, sags are observed during peak hours.
  • In suburban settlements and rural areas, the state of the electricity grid has always been far from the norm. Lights begin to blink when you turn on a powerful electric motor or welding transformer. In some areas, the situation is even worse due to the mass construction of suburban homes.
  • Consider the negative impact of adverse weather conditions. hurricane winds, heavy rains, heavy snowfalls that can damage the wires of power lines. As a result, phase misalignments can occur, potentially dangerous for any electrical equipment.
  • Emergencies often occur under the influence of the so-called human factor. Erroneous actions performed in the common electrical panels can lead to sudden voltage spikes and complete failure of electronic circuits.

All these troubles can be avoided by using a voltage regulator for the boiler, which is connected to the input of the electrical power supply of gas equipment. These devices are chosen according to the technical characteristics of the equipment and the specific conditions of use.

How much does the input voltage drop

To work requires from 140 to 260 V at the input. If a greater range is present, the device can trip.

There is an important point here. If a critical overload occurs, the equipment can fail. And that can be considered a stroke of luck. You only need to replace the regulator. But if there is no protection, the high voltage can reach the gas boiler and damage the equipment.

If there is insufficient voltage in the network, there may be a decrease in the stabilizer capacity. Many manufacturers do not indicate such a possibility in the instructions. Sometimes a severe voltage drop can cause a loss of up to 50% of the rated power.

Do you need a voltage regulator for the gas boiler?

A voltage regulator is an electrical or electromechanical device designed to maintain voltage within a predetermined range. For household appliances, including heating boilers, we are talking about a value of 220 V with a deviation of 10-15%.

With a voltage sag to 200 V modern boilers are able to operate in a normal mode, but if the indicator drops to 180 V. probably malfunction of the boiler or even stopping. If the voltage surges to 250 V and above, the electrical circuits of the boiler, not designed to operate in such conditions, elementary burn out.

Voltage fluctuations in the domestic power supply. not uncommon (especially in private households), so when installing gas boilers, it is recommended to buy additional voltage stabilizers. They will avoid malfunctions and breakdowns of heating equipment, as well as prevent dangerous situations (because the burnout of boiler circuits can lead to fires). Voltage stabilizer for the boiler is designed to solve two problems:

If stabilization of current parameters is impossible, the device breaks the circuit to protect against overload.

The difficulty of choosing a stabilizer for the boiler is the variety of products on this segment. However, after considering the main types of stabilizers and their features, it seems possible to determine the one that is the most optimal for household boilers.

Basic types of voltage regulators

The basis of such a stabilizer is a transformer with a winding, on the outer perimeter of which the carbon brushes move. Moving the brushes on the winding allows you to modulate the incoming current, stabilizing the parameter as necessary.

Disadvantages. slow response, poor performance at low temperatures, noisy, slider and servo are short-lived, can spark.

Here, instead of brushes, relays (three or five pieces) are connected to the winding of the regulator. Regulation of the number of relays, through which the current flows, provides voltage stabilization. modern version of the stabilizer, no mechanical elements in the design.

Disadvantages. step regulation with a small number of relays gives low alignment accuracy, the output voltage has an error of up to 8%, extremely noisy.

Such devices use electronic switches, such as triacs or thyristors, instead of brushes or relays. Triacs pass current in both directions, thyristors pass current only in one direction. Compact, give good accuracy.

Disadvantages. high sensitivity to noise and sharp overloads in the network. This type of regulator is more reliable and accurate than the electromechanical and relay variants, but considerably more expensive.

Rectifier, inverter and microcontroller are the main components. The principle of operation. conversion of AC to DC at the input and the reverse effect on the output. The most modern type of regulator, instantly responds to voltage fluctuations, it is reliable, highly accurate, works in the input voltage range from 90 to 310 V with a perfect output sinusoid.

The only relative disadvantage of the inverter regulator is its cost, it is more expensive than other types. But, you will agree, when it comes to safety, the question of price becomes of secondary importance.

We deliberately do not consider in this article ferroresonant stabilizers for domestic use with boilers. They are noisy, large and can not operate under significant overload. Today this type of devices is falling out of use due to impracticality.

The best voltage regulator for a gas boiler

It is obvious that for gas boilers, the inverter stabilizer is the only right solution. After all, the heating boiler. a device of increased danger, and to ensure its protection from anomalies in the power grid is a priority to prevent emergencies. At the moment, only the inverter stabilizer provides the highest accuracy, instant response, a perfect sine wave at the output and, as a consequence, gives the highest level of protection against power surges.

How to choose a stabilizer according to the characteristics

If you choose the wrong stabilizer for the boiler, it will fail too quickly or cause inconvenience during operation. Such an outcome is undesirable. So before you buy a device it is necessary to get acquainted with its technical characteristics and additional functions.

Electric power

The power of the stabilizing device is determined on the basis of how many watts the gas boiler consumes. In this case, the circulation pump is the main consumer of electricity. It pumps gas-heated water through the heating system. Typically, boiler pumps consume no more than 100-180 W.

A voltage stabilizer should be purchased with a 25-30% power reserve. If the boiler consumes 100 watts of electricity, it needs a stabilizer for at least 125-130 watts. You can not find this exact device on sale. So you have to take a stabilizer with the closest possible characteristics. For example, 150, 200 or 300 W. Most gas boilers with one circulation pump require a 400 watt regulator. You can do more, but there is no sense in it, because you have to pay extra for the extra watts.

Additional information. It is necessary to distinguish electric power input and output heat power. Electricity in the gas boiler is mainly consumed for the circulation of heated water. Heat is produced by burning gas.

Input voltage range

Mains voltage in the city limits is within normal limits and is 210-240 V. In rural areas and communities away from substations, it can vary within a wide range.

Therefore, when buying a stabilizer, it is important to pay attention to its input voltage range. Models that are able to operate at extremely low voltages are more expensive. But they are more resilient and will provide trouble-free operation of the gas electric boiler even at 140-160V input voltage.

You can find out what voltage this or that appliance is designed for from the seller. Before you buy a device, it is a good idea to look up its specifications on the Internet. It is best to look at the input voltage range in the instruction manual.

Input current and volt-ampere specifications

Volt-ampere characteristics mean the relationship between the input and output currents and voltages of the device. Here the law of conservation of energy applies. If the AVR has 200W of electrical power in it, it will have about 200W out (not taking the efficiency factor into account).

When the voltage decreases in the power grid, the stabilizer is forced to consume from it higher currents. For example, at 220 V, it draws 1 A. And at a voltage of 200 V, it requires at least 1.1 A. Accordingly, at 160 V. current consumption of 1.38 A.

These excesses must be taken into account both when selecting the stabilizing apparatus and when purchasing the supply cables and circuit breakers for protection.

With the output parameters it is easier. Voltage remains within the specified range. And therefore the current is kept in a stable state. Except that at the moment of starting the circulating pump, it can take several times more values than during normal operation.

Protections and restart function

At critically low input voltages the AVR will not be able to raise the output to the required level. Operation in such modes is detrimental both to the stabilizing device and to the gas boiler which it supplies.

That’s why good models have a function of switching the device off when the input voltage is too low. Once this parameter reaches an acceptable value, the device will automatically start and continue normal operation.

It is good if the device is equipped with a delayed start. The input voltage is able to fluctuate around the minimum permissible value. In this case the regulator will wait until the voltage remains within the normal range for a certain time.

Mounting and structural elements

Different models of stabilizers differ greatly in appearance and design. In terms of installation, there are the following types:

There are also differences in the way the input and output voltages are specified:

And if we consider the setting and control organs:

Other functions of a voltage regulator

Some models of voltage regulators are equipped with protection against overheating. It is necessary so that the device will not fail under the influence of too high temperature. Heating sensors are installed on power transformers, transistors or triacs of the device. As a rule, these are the hottest places, which are used to judge about the overall temperature condition.

In addition, the device may sometimes be built in a thermometer to measure the ambient temperature. If the air temperature in the room with the stabilizer drops below the allowable limit, it shuts down or gives an error signal.

In addition, the stabilizing device may be equipped with protection against overloads and short-circuit currents. Most often it is a simple circuit breaker built into the housing.

What is a Boiler and How does It Work?

Choice of voltage regulator for the gas boiler

The design of the gas boiler includes not only the burner and heat exchanger, but also a whole set of electronic devices. They are responsible for controlling the heating process, safety, and even the supply of heated fluid into the system. Abrupt changes in the characteristics of the electrical grid, against which neither the inhabitants of suburban areas nor the owners of urban apartments are not protected, lead to the appearance of failures in the work of electronics and even its failure.

Burned out from a power surge in the gas boiler board

The causes of such surges can be: wear and tear of power lines. even if the owner of the equipment has replaced the wiring on its territory, there is no guarantee that there are no problems with the cable lines leading to his house; lightning phenomena, often observed in spring and first half of summer; turning on or off a large number of electrical appliances or powerful equipment (such as an electric boiler installed at neighbors in an apartment building); violation of repair and welding work or rules of operation of electrical equipment. The probability of a power surge turns out to be quite high. Therefore, the question of whether you need a voltage regulator for the gas boiler, usually answers positively. over, to protect all home appliances, it is recommended not to use separate devices for boiler equipment, but common, designed for the whole house or apartment. Convinced of the need to buy a device, proceed to determining which voltage regulator to choose for the gas boiler. The selection process begins with finding the right type, then the number of phases and the minimum power that can provide effective protection. In the last step, according to the selected parameters, a suitable option is found on the market.

The main types of voltage regulators

Choosing a stabilizing device to protect the heating boiler, it is worth getting acquainted with their range. The device can be electromechanical, relay or electronic. Inverter models that provide double current conversion are also used. The efficiency of stabilizers almost does not depend on their type. They all cope with the alignment of the power grid and the disconnection of the equipment to be protected. Therefore choose the right type it is worth getting acquainted with the pros and cons of each.


The principle of operation of servo or electromechanical voltage regulator for the gas wall boiler is similar to that of autotransformers. The slider of such a device moves smoothly along the windings by means of a servo drive, a constant output voltage is ensured. The equipment is completed with roller or brush units, the first one is considered to be more reliable, the second one is more advantageous in terms of price. The advantages of electromechanical devices include: the gradual adjustment of voltage and current values, compact size, high efficiency, allowing to withstand fluctuations of 100-120 V, quiet operation (especially compared to relay models). The main drawback is considered to be the need for periodic maintenance that increases the cost of the devices. Although the problem is almost absent in models in which graphite brushes are replaced by wear-resistant rollers. One of the disadvantages is a relatively short service life. most of the parts have to be replaced within 5-10 years.

Inverter (double conversion)

With an inverter stabilizer the alternating input current first becomes direct with the help of a power factor corrector and a rectifier. Then the inverter takes over and carries out the reverse conversion. The resulting current is alternating, but already has stable characteristics. The reasons for choosing this technique are: a wide range of stabilized parameters (115-300 V); low noise produced in the process of operation, compactness and low weight, accurate enough (within 1%) stabilization. Among the disadvantages of inverter voltage regulators for gas boilers are not the most affordable price compared to other options. Note their reduced range when the load is increasing. The device works effectively until the total power of the appliances connected to it reaches 70% of the maximum value.


The main element of the relay stabilizer is a transformer with 2 windings. The primary is connected to the input line, the secondary is represented by several loops (the more of them, the more accurate stabilization). In the process of operation there is an automatic switchover to the winding, the current characteristics of which more corresponds to the required value (220 or 380 V). The list of advantages of such equipment consists of the following items: high speed of response; all the relays are placed in a sealed housing, which eliminates open sparks and increases the safety of operation, a wide range of supported capacity, regardless of the device load, a significant service life, affordable cost. Devices of this type can be called the best option for the protection of wall hung gas boiler, and floor heating equipment. The only drawback is the clicking sound of the switching relays. Therefore, it is recommended to install the devices in a separate room (boiler room, where the heating equipment is located).


The work of the voltage regulator for the gas boiler is provided by the presence of special conductors. triacs or thyristors. Its advantages are rapid response to changes and effective stabilization. The accuracy of operation allows for minimal error, providing values from 214 to 226 V. Another advantage of choosing these models is a lower noise level compared to their relay counterparts. However, the high price makes them one of the most unpopular options. The amount you have to spend on the purchase of thyristor stabilizing device, 3-4 times higher than the cost of the relay.

How to calculate the necessary power stabilizer for the gas boiler

An important nuance in the choice is the power. A value below the required one will not protect the boiler equipment, a higher one will increase costs.

Sometimes to protect a single-circuit gas boiler, a device rated at 80-100 watts is enough. The cost of such a model will be affordable, regardless of the type. Whereas the devices that ensure the operation of a two-circuit gas boiler, should be designed for a capacity of not less than 200 W, and will cost more. To determine the calculated power value is required: 1. Find the power value of the boiler electronics from its nameplate data. 2. Multiply this value by 1.3, which will provide a reserve. 3. If you do not know the characteristics of the boiler, choose a 400 W appliance. Power consumption of the electronics of most gas fired heating appliances does not exceed 65-250 W. So a 400 watt stabilizer will be more than enough. If it is necessary to connect other household appliances in the calculations take into account its power. with the same correction factor. For apartments, 6-9 kW is usually sufficient, for a private home may need a 15 or 30-kilowatt unit.

Single-phase or three-phase stabilizer?

The choice between three-phase and single-phase models is related to the parameters of the boiler equipment. Protection of equipment, designed to work in a conventional network, is provided by a 220V voltage stabilizer for the gas boiler. Equipment designed to connect to a three-phase network, requires the purchase of a device for 380 volts. Due to the fact that the three-phase stabilizer is more expensive than a single-phase, you can choose another option of protection. Instead of a 380V device for each phase, install one for 220V. The result will be a reduction in the cost of buying stabilizing devices, but the complexity of electrical work increases.

To summarize

  • Stabilizer for an electric heating boiler. an expensive pleasure.
  • If the voltage in the network never drops below 170 V, then the stabilizer makes no sense. Simply take a boiler with 30% power reserve so that even at low voltage it produces the required thermal power.
  • If the boiler is already installed and it is imperative that it works at a greatly reduced voltage (below 170 volts), you will need to put a stabilizer.

If you are an electrical engineering ninja, you can try to connect through a regulator only a circulating pump. All other nodes of the electric boiler will operate even at 140 volts. The stabilizer in this case you can take the most low-power and cheapest. But do not forget about the reduced power of the heating elements.

And most importantly: no matter how the electric boiler was connected, with or without the stabilizer, it does not save from a complete power outage. Therefore it is always necessary to have a reserve in the form of a stove, “burzhuyka” or energy-independent gas boiler, which operates without electricity.

Energy APC 1000

An excellent protective device of domestic production, equalizing the power supply to the optimal value of 220 V with an error of only 4%. Because of these properties, it can be combined with household electrical equipment of any complexity. The components used in the assembly are of high quality, the manufacturer guarantees a long service life. Active power. 700-1000 W, the input voltage varies from 140 to 260 V, and the sine wave will be clean. This single-phase 220V voltage stabilizer shows up to 98% efficiency.

  • The case made of metal;
  • Nice design;
  • Quiet operation;
  • A small percentage of error;
  • Protection from overheating, low, high voltage;
  • Light indication.

Confirm how good and effective the voltage stabilizer “Energy” reviews of users. They say it blends with most appliances and heating systems. Many had to buy adapters to the sockets, as the French standard is not so popular in the former Soviet Union. The display can be slightly different from the picture offered by the manufacturer. At night the lights burn brightly, acting as a nightlight.

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