Home Article Choose an UPS for a gas boiler with a battery

Choose an UPS for a gas boiler with a battery

Top 15 best UPS for gas boiler: 2022 rating by price/quality

Even the most sophisticated and modern heating system does not like surges in the network and frequent power outages. Think about it: maybe you should buy and install an uninterruptible power supply? This device will help you ensure the work of circulation pumps in case of sudden power problems, as well as minimize the risk of breakdowns of your unit. But few people know about such devices, and that’s why they procrastinate with their purchase. There will be no more “excuses”: we have figured out for you in all the subtleties of UPS operation, selected several of the most interesting, in terms of functionality, models, and we present for your judgment a detailed selection with a list of advantages and disadvantages of each model.

Location Name Price Rating
Best UPS for gas boiler by price/quality for 2022
1 Energy Pro 1700 Check price 4.9 / 5
2 Powercom RAPTOR RPT-1000A Learn the price 4.8 / 5
3 IPPON Back Basic 850 Check price 4.7 / 5
Best UPS with external battery for gas boiler
1 Energy Garant 500 Learn the price 4.9 / 5
2 Hiden Control HPS20-0312 Learn more about the price 4.8 / 5
3 RESANTA UBP-1000 Check price 4.7 / 5
Best UPS with double conversion for gas boiler
1 IPPON Innova G2 1000 Learn the price 4.9 / 5
2 STIHL SW1000L Check price 4.8 / 5
3 CyberPower OLS1000ERT2U Find out the price 4.7 / 5
The best interactive UPS for gas boiler
1 Energy Pro 500 Check price 4.9 / 5
2 IPPON Back Basic 650 Check out the price 4.8 / 5
3 BASTION SKAT-UPS 800/400 Learn the price 4.7 / 5
Best inexpensive UPS for gas boiler
1 Powercom RAPTOR RPT-600A Ask the price 4.9 / 5
2 Energy UPS 600 Check price 4.8 / 5
3 SVEN Pro 400 Check price 4.7 / 5

Function and principle of operation of uninterruptible power supplies

In detached houses boilers are often the only device for heating water and heating. Problems in the electrical network serving such buildings cause great inconvenience.

over, panels and control units of boilers, as well as their automatic systems need a quality power supply.

Scheme of UPS operation in “off-line” and autonomous mode on the example of online model: in the first case the stabilizer is activated, in the second case the accumulated energy goes from battery to inverter and from there to the output

Uninterruptible power supply (UPS, uninterruptible power supply), a simple device that provides a certain period of stable autonomous operation, smoothes this problem.

The back up power supply unit switches on after failures and accidents and supplies electricity to the whole boiler control system. The UPS can do this for a few tens of minutes or even more than half a day.

The main purpose of a UPS is to supply power and voltage to equipment in the event that the mains power supply is interrupted. Particularly many outages occur in the winter, sometimes because of frost, sometimes because of the economy. In this regard, uninterruptible power supplies for boilers will be very relevant in large households. Because of the frequent power outages in private households, UPSs are becoming more and more in demand.

The second main function of UPS is to protect against fluctuations and abnormal parameters of the network. If there was a power outage or many parameters changed, the UPS will switch to battery operation.

UPS is often used with solid fuel boilers. The pumps of such boilers provide movement and circulation in the radiators. Since the fuel continues to burn after the power is turned off, the liquid left in the boiler can boil. Without the intervention of an uninterruptible power supply unit this situation will end in failure or total failure of the boiler, it could even lead to an explosion.

Solid fuel boilers are more in need of UPS. these boilers are more powerful and are good as a primary and backup heating source

Constant operation of the solid fuel or gas boiler, its ignition and control panel ensures not only the heating itself or heating water, but also protects against freezing of the coolant in the pipes, which can harm the entire heating system.

In most modern models of boilers circulation of the coolant is controlled by electric pumps. The thermostat controls the external temperature. The pump starts pumping the coolant as soon as the coolant drops below the permissible limit. Then the gas valve ignites, the burner begins to work, the combustion energy fills the coolant and the fan turns on. Control of the boiler is available in the electronic unit.

Almost all of the design elements in this cycle require quality electricity with a perfect form of current:

In some devices, a bad current waveform will have critical consequences.

Uninterruptible power supplies have different operating principles and structures. UPSs for boilers usually have a battery (battery, AKB) and switch to emergency power.

Types of backup power supplies

No UPS specifically for gas or solid fuel boilers. There are only 3 types of UPSs by the way they work, and they all represent 3 different price categories.

Any small curvature of the sine wave will wear out the boiler and its components, and most uninterruptible power supplies have it different from the classic smooth

Heating boiler systems are supplied with such UPSs:

Off-line UPSs are a group of budget appliances that switch power to a battery and do not equalize voltage parameters. They include switchgear and a battery pack. In line-interactive mode, the pump and the boiler control unit receive power directly from the mains.

The backup power is triggered via a switch. Off-line devices are the least reliable and the cheapest. The off-line UPS has the same voltage waveform as the mains, and a fairly long transfer time to battery operation. The main drawback. there is no stabilization of the mains voltage.

Line-interactive uninterruptible power supplies have a built-in stabilizer. Thanks to it, the device continues to operate from the mains even under significant voltage fluctuations and is therefore more reliable. These devices do not transfer to the backup power supply after small power surges, like the off-line devices. Line-interactive devices have 2 main subcategories: UPS with right and wrong sinusoidal wave.

Budget Line-interactive UPS Luxeon with built-in stabilizer, time of transition to battery 0,5 s and the accuracy of stabilization of 10

  • the output signal can be stepped or smooth;
  • long-term operation;
  • long service life;
  • long transitory period of operation without switching to battery
  • voltage equalization by the stabilizer.

Online devices have a fundamentally different structure than off-line and line-interactive. On-line devices convert alternating current into direct current and then back into alternating current.

Their battery is charged at a reduced DC voltage. It is constantly active, does not need to be switched and starts working immediately if the mains voltage is cut. The battery also fuels the boiler if the mains voltage is available, but too low.

As for the sinusoidal waveform, on-line devices have an even waveform, not a step waveform, and do not have noticeable distortions. For many gas-fired boilers, frequency stability is crucial.

Selection criteria for an uninterruptible power supply for the boiler

There are more than 5 principles of a successful choice of an uninterruptible power supply. Newer and better devices are generally to be preferred. Keep in mind the peculiarities of power grids. they are overwhelmingly unstable.

Pay attention to the key characteristics:

  • Power.
  • Charger current.
  • Battery capacity.
  • Ability to connect external batteries.
  • Duration of operation in standalone/emergency mode.
  • Transition time to battery.
  • The shape of the output signal (voltage), t. е. output sine wave.
  • Presence of leading-edge zero.

Power. For two-circuit boilers that heat a lot of tap water, an uninterruptible power supply will either be useless or will only support operation for a short time and only if it is very powerful. Consider the number of circulation pumps (the more. the more power is needed) and the power of the boiler itself.

Remember that UPS up to 200 W are suitable for the most low-power boilers. If the boiler is gas-fired, it has a capacity of about 80 to 300 W or more. Uninterruptible power supply should be purchased at 25% of the boiler’s capacity. Usually the UPS capacity for a boiler is limited to 600 W.

UPS can be upgraded and strengthened in terms of power: to increase the capacity, increase the cross section of wires, change the sockets

The power of the UPS is calculated using the formula A = B / C × D, where:

  • A. battery power (watts, wattage);
  • B. boiler power (W, watts);
  • C. reactive load factor (0.7);
  • D. 3 times the starting current reserve (3).

The result will be the minimum power required by the battery, but you must add 30% to it for reserve.

The calculation must also include the power of all pumps, if they are present in the system. Include this figure in the numerator, adding it to the boiler power.

As for the battery charger current, 1 A will be enough to operate one 10 Ah battery. A battery with a capacity of 80-100 Ah can be used for a current of 8 A. If you make a mistake in the selection of the battery, then he himself and the UPS will last less than it should.

The amount of current limits the ability to use a capacity greater than a certain value, so you should choose a powerful charger right away. Choosing the parameter of the uninterruptible power supply by the current parameter is also a selection on the duration of autonomous work.

The next main parameter is the battery capacity. With this in mind, standby units with the ability to connect external batteries are suitable. Such UPS will operate much longer in the emergency mode, that is, after disconnection from the mains. External batteries should be fully charged, because partial recharging will result in a shorter runtime.

If the gel battery stops charging, you can try to restore it with distilled water, pour it through a syringe and wait for it to soak into the fiberglass

An important parameter. autonomy. The maximum duration of autonomous operation depends on the battery or its unit. An uninterruptible power supply with one internal battery can sometimes provide only 10-20 minutes of autonomy.

To calculate runtime, multiply the number of internal and external batteries and the capacity of each. Ideally you should buy a UPS with many external batteries and then buy the batteries separately. This will extend autonomous operation to several hours, which also avoids complete discharge.

Consider the capacity of the UPS battery charger. It limits the possibilities in terms of autonomous mode. Some on-line UPS units produce more than 20A, and this allows you to use units of 200-300Ah.

The total capacity of batteries is increased by connecting in parallel, series. sums up the voltage, and this may be necessary for uninterruptible power supplies, which do not require a 12 V DC connection. High-power UPS need more circuit voltage for the device to work qualitatively.

Autonomous operation time reaches 10 hours or more, and here much depends on the boiler capacity, charger current and battery capacity. You should consider the regularity of fluctuations in the network and power outages. In this case, pay attention to the quality of the protection system against fluctuations in the network.

Single battery operating time is calculated by the formula T = Q × U / W, where:

  • T. time (hours);
  • Q. battery capacity (Ah, ampere-hour)
  • U. its voltage (V, volts);
  • W. total power of the load (W, watts).

The speed of switching to the battery shows how quickly the UPS will switch to battery power in case of power failure. Online devices switch to “standby” instantly, others do it with a delay of at least 0.002-0.015 seconds, and sometimes. a few seconds.

The shape of the output voltage. The signal that comes out of the uninterruptible power supply and reaches the boiler affects its operation. Electricity parameters affect the movement of circulation pump motors. Low and medium quality UPS in battery mode and unstable power grid outputs current in the form of a meander, that is, in the form of an uneven or modified sine wave. The boiler will run irregularly, which further increases the load on the boiler and the electricity consumption.

The shape of the voltage output from the UPS is key. It may appear as an approximated sine wave or a trapezoid. Such parameters are hardly tolerated by circulation pumps. This will be indicated by a buzzing noise and jerky operation. Uninterruptible power supply for a pump must be chosen with the best characteristics, otherwise the pump will break down over time.

How to choose an UPS for a gas boiler

When we found out the power consumption, the value of the battery charge and how to equalize the voltage, you can move on to the choice of the “UPS” itself. Online stores offer power supplies with 3 types of architecture:

The principle of operation of the off-line “uninterruptible power supply” is simple: the voltage entering the unit is the same as the output voltage. If the grid drops too much, the unit uses the battery’s energy. Online unit works differently: first the input current is rectified, “driven” into a strict range. 220 230 V, 50 Hz, then converted back into alternating current and sent to the consumer. A line-interactive UPS is an off-line unit with a built-in stabilizer.

Reference. The cost of “uninterruptible power supplies” depends on the architecture, power and input voltage range. Example: Chinese UPS “Luxeon” (Luxeon) 0.3 kW type online costs about 60 u. е., The analogous interactive one is 100 u. е. If you need 700 watts of power, the cost goes up to 210 and 160 u. е. respectively.

A UPS designed for heating equipment must produce a correct sine wave output. The online “UPS” from Luxeon meets this requirement

What is the best UPS for the gas boiler?

  • To maintain the heat generator is best suited UPS continuous operation (online) with the ability to connect external batteries. Off line devices are not suitable.
  • If the power consumption does not exceed 0.If your power plant has a capacity of 5 kW and the shutdown time is 1 hour, a linear-interactive unit with an integrated battery is the right choice.
  • The back-up power supply must give a clear sinusoidal output, which is important for the normal operation of the electric motors of pumps. UPS for household appliances or computers are not suitable for boilers, because they produce a so-called approximated sine wave or quasi-sine wave.
  • To avoid buying a separate stabilizer, choose a device that is able to smooth out voltage fluctuations in the electrical system. There are models, which equalize voltage in a wide range from 120 to 300 volts, though such UPS cost more than usual.
  • When using a generator, not only the voltage but also the frequency must be stabilized. Here you need an “uninterruptible” type online with an inverter, it makes no sense to use others.
  • Imported wall hung boilers are often sensitive to phase location. If you insert the plug into the outlet incorrectly, the unit will go into error. You should look for power supply with through “zero” for such heater.

Clarification on computer UPSs. The approximated sine wave at the output of such devices is well perceived by electronics, but the asynchronous motors of pumps are strongly heated, hum and fail quickly. That’s why you need an “uninterruptible power supply” with the right sine wave.

It is best to test a new backup power supply at once. Connect the device to the gas boiler according to the instructions and try to run the unit in heating mode. If the automatic ignition does not work, the unit must be replaced with another model.

Household UPS for solid fuel boilers is selected in the same way. determined by the power of the electric installation and the controller, the quality of electricity supply and duration of autonomous mode. Next, follow our advice or recommendations voiced on the

“Uninterruptible power supply and car battery

Using lead-acid car batteries in combination with UPS is extremely undesirable. But many homeowners do it anyway, the main argument is lower price of the power supply. Why you can’t operate an uninterruptible power supply with a car battery:

  • Car batteries are starter batteries, their job is to deliver a high starting current, then recharge to maximum. The UPS requires traction batteries made with GEL or AGM technology.
  • Car battery is afraid of deep discharge, 2-3 such cycles will happen and its capacity will be significantly reduced.
  • While charging an acid battery emits harmful gases and hydrogen into the room. Under certain conditions, it can explode. it’s a well-known fact.
  • From the lead-acid battery will quickly boil off the electrolyte, you will have to constantly monitor the level and pour distilled water, check the density, and so on.
  • The service life of specialized gel batteries is 6-10 years, car batteries will not “live” even half of this period.

Hence the conclusion: do not operate the UPS for the gas boiler with auto battery, except as a last resort, as a temporary power source. It is better to buy specialized traction batteries and not to worry.

By type

The division of uninterruptible power supplies on the principle of operation is fundamental and allows you to choose a device based on its functionality and operating scheme. On the type of selected UPS depends not only on the convenience and duration of its operation, but also the capabilities of the heating equipment. According to the operating principle UPSs are: off-lan, online, line-interactive.

Standard budget devices, which do not have a current regulator. Serves to provide backup power in case of power failure. This type of device is quite popular, thanks to its practicality and low cost.

Among the main characteristics of an off-line UPS:

Small size and weight; floor or wall mounting; limited functionality; no current stabilization module; no ability to stabilize the line voltage; low cost.

Off-line device is suitable for a limited budget, because its cost is within the affordable range, but despite the cheapness, such an uninterruptible power supply is a guarantee of safety. Thanks to the built-in battery, this type of device is able to provide backup power to the boiler up to 2 hours, but the device cannot stabilize the voltage in the network. Therefore, it is advisable to connect the off-line UPS only if the network with a stable voltage.

Line-interactive UPS

Equipped with additional stepped AVR stabilizer at the input, which provides regulated voltage at the output. The main advantage of the device in comparison with other types is to provide stable power supply at high or low voltage without switching to standalone mode.

Line-interactive type device is used in the following cases:

When voltage stabilization is required; need for added safety of gas-fired equipment; low voltage fluctuations; to provide short-term backup operation of the system.

Rechargeable capacity of devices is relatively small and in case of power failure can provide autonomous operation of boilers for 15-20 minutes.

Duration of backup power can be extended up to 10 hours by connecting an external battery.

Which batteries are used?

UPS systems come with lead-acid batteries. Sealed batteries are used. They are safe and maintenance free. Batteries are available in gel or fiberglass.

The electrolyte of gel batteries contains silicon compounds, thus increasing its density. The contents of the battery does not splash out when shaking and when tipping the appliance. This provides safe operation of the device.

Popular manufacturer brands and their brief description

The UPS from the following manufacturers are in the greatest demand:

  • Energy. Modern high-precision devices. Convenient and safe in operation. Exceptional stabilizer accuracy. The error margin is less than 5%. The device can be connected to the boiler even in case of sudden power surges. UPS features an intelligent charging system. It monitors the battery capacity and condition and selects the best charging mode.
  • HeliorSigma. The devices have a clean sine-wave voltage at the output. Keeps gas boilers running smoothly. Maximal load is up to 800 watts.
  • StarkCountry. Devices provide a perfect output voltage during a power outage. Starts working automatically when there is a voltage problem. The devices are equipped with a display that shows battery capacity and other parameters.
  • Lanches. The company exists since 2010. High quality and affordable UPS. All devices are of high quality and ensure the operation of boilers at any time.
  • Bastion. UPS are of high quality and reliability. The devices have a UPS, allowing you to connect the load directly. Easy to use and quick to start.
  • PowercomImperial. UPS are made by modern technology. Judging by the reviews of consumers the products are of high quality. Devices work autonomously for up to several hours.
  • STIHL. Work by online technology, converting alternating current to direct current and vice versa. Batteries are constantly in use, so the power supply is changed instantly.
  • CyberPower. One of the leaders in the production of devices for uninterrupted operation of boilers. Provide power supply, keeping the appliance operable even in case of a power grid failure.

Buying a UPS you should understand that the equipment will require maintenance

Especially if it works around the clock. For injection isopropyl alcohol (disposable wipes) is suitable. The fan is lubricated with graphite grease (for its longevity and to prevent noise). At least with these small manipulations you will prolong the life of your UPS for about a year and most importantly the noise will be much less.

The main advantages of raising the voltage is to reduce current consequently, reduce voltage losses and reduce the useless waste of energy on heating the conductors. Connecting the batteries in parallel is not recommended, because it is unrealistic to find several batteries of the same internal resistance. Connecting the batteries in parallel will accelerate the discharge of the battery, because they will start to discharge each other. And so on. Regarding the connection of the UPS to the gasoline generator, as an option from the generator to power the charger, which will issue a constant current to the terminals of the battery, from which the UPS will be powered in inverter mode.

BEST UPS. Top 7 Best Ups In 2021


Leoch is a Chinese lead acid battery manufacturer with plants in Malaysia, India, China and Sri Lanka. On the market since 1999. The company has its own scientific base, is actively involved in the development of new technologies, as evidenced by the more than 900 patents.

Product Features

Uninterruptible power supplies may use models of the 9 lines of batteries from this manufacturer, but for long-term operation the following series are the most interesting:

  • LCP. AGM with capacity of 38-250 Ah at 12 V. Service life up to 12 years;
  • DJM. AGM 38-250 Ah at 6 or 12 V. Service life of 12 years;
  • LPG. GEL with 12-3000 Ah capacity and voltage 2 or 12 V. Life span of 16 years;
  • XP. AGM with a capacity of 27-250 Ah and a voltage of 12 V. Service life is 12 years;
  • LPC. AGM capacity 3.5-200 Ah at 6 or 12 V. Service life 12 years. For cyclic duty.

Conclusion: Leoch. a quality Chinese brand, undeservedly overlooked by consumers. An excellent solution for residents of large cities, where it is realistic to find the products of this TM and save up to 30% compared to the purchase of highly touted brands.

CD Technologies

CD Technologies company has been working in the field of battery production for more than 100 years. Since the 1970s, the company has been developing VRLA batteries with an emphasis on AGM technology. Production bases are located in the USA, China, Canada and Mexico. The official representative of the company in the territory is Nord-Energo.

Product features

For connection to UPS developed a series of CD UPS High Rate Max with batteries of different capacity: from 26 to 208 Ah. Implemented in hermetically sealed rugged housing. Unique patented technologies are used.

Other features include:

  • The use of a lead alloy with minimal calcium, which has a positive effect on service life;
  • the presence of flame-retardant valves in each power cell;
  • The housing and cover are made of flame retardant polypropylene;
  • 3-year warranty

Conclusion: if the UPS with a battery will be at a temperature of 23 to 27 degrees, you can count on a 10-year battery life from CD Technologies. On average, they last at least 7 years. The capacity of the products corresponds to the declared capacity. High cost is justified by high quality.


Here we answer the most exciting buyers questions. Couldn’t find your question? Write in the Комментарии и мнения владельцев!

You can, but this battery will not work efficiently. The reason for the different principles of operation of technology. Specialized car batteries are designed for the starter load: their main task is to help start the car engine. In other words, a car battery doesn’t like constant consumption, which can lead to a deep discharge.

Batteries for UPS must run evenly. Their main task is to ensure uninterrupted operation of the appliance for a certain time. This implies a constant discharge of batteries to their limits. If you use a car battery in combination with a UPS, you can lose your battery.

However, there are a lot of examples on the internet of how car batteries can peacefully coexist with UPS systems. Basically, it is the experts who know the subject in depth. For example, this user plugged in a car battery and even provided a simple venting system for the gases that form inside the battery when charging.

If you have ever tried to connect a car battery and it worked, post in the Комментарии и мнения владельцев!

This question is usually asked by customers who have seen the price difference between the UPS for computers and for boilers. The first ones are 2-3 times cheaper. What’s the problem?

Many UPSs for computers produce a meander instead of a pure sine wave. It’s not terrible for computer equipment, but it’s fraught with breakdowns for boilers with pumps. Recently, however, so-called Smart UPSs for computers have appeared, which produce a pure sine output. Of course, the price of them is higher than the usual computer UPS. They are comparable to the of UPS for boilers, so there is little point in taking a specialized computer uninterruptible power supply.

UPS / Battery Backup. Do You Need One?. How much do you need?

Another obstacle is the low charging speed of the batteries. Computer UPSs draw less current, and if you connect the same battery to two uninterruptible power supplies, one for the computer and one for the boiler, the charger of the first unit will take longer to charge the batteries. This can be a problem when the power is out every day or even every few hours.

Parameter Designation What is measured Where to find
Battery capacity Е Ampere Hours (Ah) In the characteristics of the battery
The voltage of the batteries to be connected V Volt (V) In the characteristics of an inverter
Efficiency of inverter η fraction of 1
Inverter capacity P Watt (W) See. example calculation at the beginning of the article

If you know all the parameters, just substitute them in this formula:

The resulting value is the number of hours that the boiler will run from the UPS.

Total running time of the boiler from UPS: t=100x12x0,95/300=3,8 h.

Depends on what you are trying to achieve. The batteries are connected either in series or in parallel. In the first case, the goal is to equalize the voltages of the inverter and the battery. For example, the inverter is designed to connect the battery with a voltage of 12 V, but the battery voltage is only 6 V. Two batteries connected in series will provide the necessary 12 V.

In the second case the goal is to increase the capacity of the battery. For example, you need 100 Ah of power, but you only have one 55 Ah battery. Purchase a second battery of 45 Ah and connect it in parallel with the first one will provide the necessary 100 Ah.

How to connect the batteries to each other and what are the limitations of the connection, see this

The only category of UPS capable of operating without batteries is the UPS for computers. They provide uninterrupted operation for a few minutes after a power outage so that the user has time to save important data and shut down the device safely. Of course, this will not settle the boiler, which consumes much more power and needs uninterrupted operation for several hours.

At the output of the generator there is often a distorted signal (pure sine wave with voltage of 220 V and frequency of 50 Hz) instead of the correct signal. This is where the online UPS comes in: It converts the bad alternating current from a generator to direct current, and then back to alternating current, but with the right parameters.

Another reason to connect an online UPS between the generator and the boiler is the long startup time of the generator. When there is a power outage, the generator automation gets a signal to turn on the power, but it takes 10-120 seconds for the generator to kick in. During this time, the boiler and the pump have time to turn off.

The alternator can be thought of as an analogue to the batteries: it powers the UPS with electricity, and for much longer than the battery. But we recommend that you do not refuse to buy batteries in order to avoid disabling appliances during prolonged generator start-up.

Here it’s better to consider UPS components. inverter and battery separately. Most inverters work at temperatures from 0 to 40 degrees Celsius. That means you just need to take care of them in winter.

Batteries are a little more complicated. The ideal temperature for their storage. 0 ° C, and to work. 25 ° C. Try to keep the temperature within these limits and do not place the battery near heating pipes. At higher temperatures, batteries discharge faster and have a shorter life.

Share your own experiences in the Комментарии и мнения владельцев if you’ve dealt with uninterruptors for the boiler. And if you are just going to buy a UPS, specify the brand of your boiler and the quality of voltage in the network. we will try to pick up the ideal device for you from our review.

How to choose a UPS for a gas boiler

Gas heating boiler is equipped with “whimsical” electronics, so the UPS must be reliable and functional. But it is not easy to choose due to the diversity of technical parameters and the fact that many companies produce such devices.

UPS for a gas boiler are divided into two varieties: with and without a battery. The former are easy to install and connect, but the choice of battery capacity is limited, and if you choose, then with a higher capacity power source.

Devices without a battery are more variable in application. Essentially an inverter that stabilizes the output voltage and provides low distortion. And it is possible to connect an external battery. One unit is combined with other units, and you get a full-fledged reliable uninterruptible power supply for the gas boiler.


When the power supply is all right, the standby UPS, which is also called off-line, operates as an intermediary. delivers voltage and current with the same parameters as those at the input. If there is a power outage, or the output parameters change, the UPS switches the boiler to battery operation.

Power capacity of batteries installed in the standby UPS, on average, 5. 10 Ah. This is 10-30 minutes of autonomous work of the heating equipment. They have a useful function. they do not let the connected equipment shut down, and give time to manually stop.

Offline models. switches boiler power from mains to off-line.


advanced devices, equipped with a battery and voltage regulators, so the output gives 220 V. Models more expensive are able to “read” the sine wave and if it deviates by 5. 10%, they switch the equipment to work on battery power. But the UPS can not correct the sine wave.

Typically, these models, with higher output power, are taken for installation at the entrance of the wiring in the house, connecting them to a power-hungry battery.


These are on-line UPSs, which provide stable output parameters of the network, regardless of incoming. It doesn’t matter if there is voltage at the input or not: the boiler will always run on battery power. Principle: two-stage conversion of electricity. In the first phase, the incoming voltage is reduced, the AC current is equalized, and the energy goes to charge the battery. The second stage is the reverse process, when the electricity is given away. It is removed from the battery terminals, the current is made AC, the voltage rises and goes to the output of the UPS.

What all this gives. the boiler runs on an uninterruptible power supply, fully autonomous, with set parameters. Voltage fluctuations, sinusoidal changes and even lightning strikes do not scare the equipment. External factors can damage the UPS, but not the boiler.

choose, boiler, battery
  • Connected devices continue to receive power even if there is a power outage;
  • stable electrical parameters;
  • are recharged by a gasoline generator;
  • Can adjust output voltage.

On-line models are expensive, and relevant if they are connected to a high-power equipment and batteries of high power capacity.

Computer UPS for the gas boiler is not suitable for the following reasons:

  • low battery capacity, which gives a little autonomy time;
  • No protection against overheating;
  • The approximated sinusoid will affect the normal operation of the equipment.


In the descriptions there are two parameters. full and active power. Looking at the second. it must be two times higher than the total linear power of the connected equipment. So the UPS can easily withstand the starting currents of the electric pump and fan. It is compensation for possible overload.

On the advice of professionals, it is necessary to consider not only the starting power of the pump and fan, but also their energy efficiency class (from A to G). For all but A, the power consumption is increased by a factor of five (for A, by 1.3).

Energy efficiency classes.

Example: Boiler power 200 W, C-Class pump 40 W, A-Class fan 30 W. Total power: 200 40 x 5 30 x 1.3 = 403.3 W. You need a safety margin. multiply that by 1.2: 403.3 х 1.2 = 484 W.

Autonomy duration

The UPS provides the boiler system with a back-up power supply for a specified period of time. It should be enough to keep the boiler running for a while until the power failure is eliminated or the generator starts. The runtime of an uninterruptible power supply depends on two factors: the number and power capacity of the batteries, and the power consumption of the connected equipment. Different back-up times may also apply to one UPS model depending on the load.

Rating of the best UPS for gas boilers

To choose the best UPS, look at the modification and technical parameters. To facilitate the task was compiled a rating of models that ensure stable operation of the boiler unit.

Ecovolt Termo 312

Off-line uninterruptible power 300W rated, allowing short-term overload (will work 1 minute in case of 125% overload). Equipped with built-in stabilizer working in the 140 to 280 V range. Depth of charge and amperage is controlled by the smart charger. A digital keypad is provided for selection of desired parameters.

It has a wall-mounted construction, there are no internal batteries. you have to take them separately. Thanks to the compact size, it is easier to find a place for installation, but because of the reduction of dimensions the fans work noisier. Model produces a correct sine wave, can throw through “neutral”, and at the same time is available.


Linear interactive UPS with auto-start feature. With built-in protection against power surges, overloads and short circuits. Switches to battery in 8 ms, with distinctive beep. The output voltage stability is ±10%, there is a built-in voltage converter. Convenient operation is provided by a three-position current charge switch. Input voltage stabilization range. 140. 275 V.

Stark Country 1000 Online

UPS works on the principle of double conversion (On-line), which means that the connected boiler is powered directly from it, not from the mains. In this regard, stable output voltage is ensured, regardless of voltage fluctuations or power outage. The power of the model is 900 W, so in addition to the boiler can connect other single-phase equipment.

This model can be connected to two 200 Ah batteries. This is enough to maintain the boiler with pumps in a house of 350 m2 for about 13 hours.

  • reliability;
  • Switching time. 0 ms;
  • When connecting high-capacity batteries, you can set the charging current up to 16 A;
  • Input voltage range. 110. 300 V;
  • design, informative display.

ELTENA (INELT) Monolith E1000LT

A premium 800-watt unit with an input voltage range of 110 to 300 V. At voltage sags or the complete absence of electricity instantly switches to standalone operation. At surges works as a stabilizer or converter. Equipped with microprocessor control.

Informative display on the front of the housing. Input voltage, frequency conversion, eco-mode, bypass, etc. can be set via the control buttons.д. All necessary interfaces, even to connect a PC or install an SNMP-card.

  • power;
  • set of modes and settings;
  • at the output produces a pure sine wave;
  • Operation monitoring via computer;
  • AB 45 to 150 Ah can be connected.

BASTION Teplocom-1000

Dual-conversion UPS with 800 W of power, enough even for heavy-duty thermal equipment. This model is designed specifically to work with the heating system, so it is equipped with a device that automatically shuts off the gas supply. UPS BASTION operates in automatic mode, has all the necessary protection functions, cold start, bypass.

Input voltage range is 155 V to 295 V. Stability of output (in battery mode) is ±3%.

  • operation indication;
  • autostart;
  • low noise level;
  • microprocessor provides minimum voltage fluctuations;
  • instantaneous switching to standalone mode.

MAP PRO 1.3 kW

It is a classic inverter working in tandem with a generator. a good solution for networks with frequent long-term blackouts. The device is not so picky about the quality of input voltage as a traditional UPS. For example, in the settings, you can specify that power comes from a generator, and the input frequency range will be 35. 75 Hz. At the same time, the MAP PRO is practically not heated, which is a weak point of On-line models. Another feature is adaptability to overloads. That is, such power is enough even if the system has units with increased starting currents. In addition, there is an ECO mode, which increases the output power for a short time.

  • undemanding to the input voltage frequency changes;
  • Suitable for virtually all batteries;
  • Capable of withstanding nearly twofold overload;
  • “correct” neutral.

UPS-12-300N OffLine

Compact PSU, designed for hidden installation, so it is characterized by small size and weight. This UPS, which also serves as a stabilizing function, has a capacity of 300 watts, which is enough for an apartment. To work on battery power is switched for 0.5 sec. To the device can connect the battery up to 200 Ah, moreover, is built “smart” Charger with a current of 7 A. With a sinusoidal shape of the output voltage uninterruptible power supply capable of working with any boilers, even voltage-sensitive models.

Top models clearly shows that the power of 500. 1000 watts is enough for most heating systems, even if the house “warm floor” and the pump pumping water from the well. What better UPS to buy. depends on personal needs, but it is better to know in advance the range of voltage drops, duration and frequency of power outages.



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