Overview of gas boilers Lemax

It takes a dependable heating system to keep your house warm during the cold months. Due to their ability to provide effective and efficient heating for residential properties, gas boilers are a popular option among homeowners. This post will examine the selection of gas boilers that Lemax, a reputable brand in the heating sector, offers in more detail.

The dual purposes of Lemax gas boilers are comfort and security. These boilers are designed with an emphasis on high-quality craftsmanship and cutting-edge technology in order to maximize energy efficiency while delivering consistent heat. Lemax offers a range of models to accommodate various household needs and preferences, whether you’re installing a new system or upgrading an old one.

The dependability of Lemax gas boilers is one of their best qualities. These boilers are designed to endure regular use and are made of sturdy materials that go through extensive testing to guarantee long-lasting performance. As a result, there will be fewer malfunctions and maintenance problems, giving you continuous comfort all year long.

Efficiency is yet another crucial aspect to take into account when selecting a heating system, and Lemax delivers in this area as well. Their gas boilers are made to function as efficiently as possible, saving you money on energy bills and lessening your carbon footprint. Regardless of your choice—a condensing boiler or a conventional model—you can be sure that the product you’re getting puts energy conservation first.

Lemax gas boilers not only offer dependability and efficiency but also convenience and versatility. There is a boiler to suit every residential situation, ranging from small, space-saving models to larger, multi-unit heaters. Plus, managing your heating has never been simpler thanks to features like smart home system compatibility and programmable thermostats.

All things considered, Lemax gas boilers are a wise option for homeowners searching for durable heating systems. These boilers provide years of comfort and peace of mind because of their fine construction, energy efficiency, and user-friendly features.

Lemax gas boilers are an excellent option if you want to keep your house warm and comfortable while using less energy. Gas boilers from Lemax provide dependable heating options with cutting-edge features to guarantee peak efficiency and comfort. Lemax boilers are designed to meet a variety of needs, ranging from powerful models that can heat larger homes to compact designs that are ideal for smaller spaces. Long-term energy savings are a benefit of Lemax gas boilers, which prioritize longevity and efficiency in addition to providing reliable warmth. Whether you’re building a new house or renovating your existing one, taking Lemax gas boilers into consideration can result in a more sustainable and comfortable living space.

About the manufacturer

Trademark "Lemax" is owned by LLC "Lemax" (INN 6154001478), which was established in Lemax, Russia, in 1992. Taganrog, the manufacturer’s address is still the same as of right now. Although producing gas heating boilers is the company’s primary activity, it also makes heating radiators and water heaters. Products are distributed via regular partner stores as well as official dealers.

A large sales structure (the brand is represented in nearly every store due to demand), a developed service structure, a hotline, and an adequate number of qualified specialists in practically every region of Russia are also present.

With some of the best technical specifications available for domestic boilers, Lemax boilers have proven to be dependable and trouble-free in real-world applications. Working models from the years 2005 to 2010 can still be found in private residences. The models of "Siberia" are the closest analog, igniting debates about which of these two brands is more dependable and superior in terms of "price-quality" ratio.

An analysis of Siberian gas boilers Among domestic models, one of the most dependable

However, "Lemax" is in high demand, which makes sense given their well-known characteristics. The most well-known models, Lemax Premium-10, with a capacity of 10 kW – 1.2 m 3 /hour, and Lemax Leader-16, with a capacity of 16 kW – 1.9 m 3 /hour, have some of the best gas consumption indicators among domestic models. I want to draw attention in particular to the superb assembly quality, which is exceptional and not typical of domestic manufacturers: there are very few and even gaps, everything is precisely fitted and equipped, and even after 4-6 years of use, bends and connections do not rust.

The majority of domestic models, such as the well-known Italian EuroSit automatics and Polidoro burners, have standard boiler designs. It is implied by this design that there is nothing in it to break. Steel heat exchangers are constructed from premium steel, which has never raised any concerns up to this point. However, its thickness is only 2 mm, as opposed to 3–4 mm for analogs. dependable and tried-and-true, but the truth is still truth.

A more noticeable conditional drawback is the high connection, installation, and adjustment requirements. Lemax boiler installation is a bit more difficult than that of analog models and calls for specific skills. If employees at Gorgaz, Oblgaz, etc. did not frequently display incompetence, there would be no need to concentrate on this. It’s possible that the boiler wiring is defective, which could lead to issues with automation startup and operation (it might be necessary to replace the damaged wiring with factory wiring).

Boilers also pose challenges when it comes to the burner’s initial adjustment: an excessively high gas pressure can result in unsettling pops during ignition, while a low gas pressure can cause issues with the main burner’s ignition. It is particularly crucial to follow the chimney’s requirements because, in the event of insufficient draught, the boiler fades out and the draught sensor is triggered. Additionally, the boiler goes out with even the smallest backdraft. This phenomenon, however, is typical of all unprotected against atmospheric back draft and is only conceivable in the event that the chimney’s design is flawed.

Otherwise, the main rule is to carefully comply with all requirements, competently perform installation and commissioning work. According to the owners" feedback and installation practice, all competently adjusted boilers, regardless of the model, operate without problems for 10 and more years.

Reviews of owners about gas boilers Lemax: advantages and disadvantages

Advantages	Disadvantages
High technical characteristics (efficiency, gas consumption, DHW capacity)	High requirements for installation and commissioning, chimney
Simple known design, which determines reliability	Some buyers note the models are somewhat "expensive"
With competent installation and commissioning, there are practically no cases of serious malfunctions in the first 8-10 years of operation	Some owners complain about flapping, somewhat noisy operation
The presence of energy-independent models, the presence of even more durable cast-iron models	Sometimes note the more tangible dimensions of both floor and hinged models
Availability of two-circuit models	The boiler room must be kept clean and the boiler must be cleaned regularly, otherwise clogging and problems with starting or ignition may occur
Excellent build quality, comparable to many analogs of European production
Developed service structure, availability of competent specialists in almost all regions, availability of spare parts

The best and most famous models: features and prices

Floor standing

Premium

Among the entire range of Lemax heating boilers, this model is highly successful and well-liked due to its steel heat exchanger and energy-independent nature. The models in the series have the following power outputs: 7,5,10,12,5,16,20,20,25,30,35,40,50,60,70,80,90, and 100 kW. Current two-circuit boilers are more expensive on average by 5,000 rubles than single-circuit analog boilers and are denoted by the prefix "B," such as Lemax Premium-16V.

The model is notable for its high efficiency of 90% and low gas consumption. For instance, the maximum indicator in the 10 kW version is 1.2 m 3 /hour, while in the 16 kW version, it is 1.9 m 3 /hour. Referred to as a win-win and problem-free option by specialists, the first three options for low-cost floor atmospheric boilers are suggested.

One of the drawbacks is the heat exchanger’s relatively thin (2 mm) steel, but in reality, boilers last a standard 10 to 14 years because of their excellent quality. Other than that, the boiler has all of the previously listed drawbacks that are typical of other Lemax models: it requires a primary setting and chimney, adheres to cleanliness regulations, is large, and its flame burner goes out when there is a back draft in the chimney (even though it has blower protection).

It is not advised to use the model in closed systems, where the operating pressure is typically 1,5-2 bar, as there is only a maximum permitted operating pressure of 1 bar.

Leader

The energy-saving model remains unchanged, but it now has a cast iron heat exchanger that is much more robust and resistant to corrosion, with a service life of 25 to 30 years. They have the same fuel consumption figures, the same 90% efficiency, and a higher working pressure of 4 bar. Only single-circuit versions of the model, with capacities of 16, 25, 40, and 50 kW, are available. The 820 NOVA SIT, an upgraded and more sophisticated version of EuroSit automatics, is fitted to models beginning with "N." This version allows for the connection of an external control device, such as a room thermostat, and features a temperature designation on the thermostat.

How to pick a room thermostat to reduce your monthly heating expenses by up to 30%

The assembly quality, specifically the caliber of the fastening and fixing elements, is the drawback, though it is not as good as it is with other models. It is also important to note that the price is somewhat expensive, although there are already some more sophisticated European alternatives available.

Wise

Lemax makes some of the best gas boilers for heating individual homes. It is an energy-dependent atmosphere with a cast iron heat exchanger that has an auto-ignition feature and a modulating burner.

The model is well-known for having a very low gas consumption; in reality, the 16 kW version frequently uses between 0.9 and 1.2 m 3 /hour even though the maximum gas consumption indicators are the same. This is made possible by a modulating burner and energy-dependent functional automation that can sustain continuous combustion at a minimum capacity, the most efficient mode of fuel combustion.

Wise boilers are easy to set up because, in contrast to other models in the brand, they are well-suited to fluctuations in both power and gas pressure. It is feasible to set up weather-dependent operation and connect external control. This is the only model that lacks nearly every feature that was previously mentioned as a drawback. The sole noteworthy drawback is its exorbitant cost, which is on par with the most dependable and efficient gas floor standing boilers made in Italy and Japan. Versions with capacities of 16, 25, 35, 40, and 50 kW are available.

Wall-mounted

Prime-V

Mounted convection boiler with two circuits and a closed combustion chamber. Versions with 10, 12, 14, 16, 18, 18, 20, 24, 26, 28, and 32 kW of heat output are available.

The model’s design, which is made up completely of imported European parts, is unusual. The main heat exchanger is made of copper, the burner can adjust the flame, the combustion chamber is closed, and there is a layer of both thermal and acoustic insulation. These factors combined to produce an efficiency of 92.5%, which is among the best for standard convection boilers and naturally reduced gas consumption. The maximum gas consumption of the 18 kW model, for instance, is 2.04 m 3 /hour, which is less than many models in Europe.

Prime-V’sprimarydrawback is its price, which is on par with similar models from Japan and Europe. The most popular, dependable, efficient, and trouble-free Italian BAXI ECO-4s are actually the direct competitors; they have nearly the exact same functionality, a slightly larger set of safety systems, and nearly the exact same design with a copper heat exchanger and flame modulation. It does, however, perform somewhat worse in terms of gas consumption, DHW temperature, and flexibility with respect to power grid voltage fluctuations and variations in gas pressure.

Prime-V directly competes with the best foreign models after losing its primary competitive advantage, price, which makes the decision regarding the "price-quality" ratio less clear-cut.

Parapet

Patriot

One of the most popular and effective energy-independent gas boilers with a parapet. It stands out for having an efficiency of 87% for parapet models and consuming little gas—1.2 m 3 per hour for the 10 kW model, for instance. In versions ranging from 6, 7.5, 10, 12.5, 16, and 20 kW. Only a steel heat exchanger constructed from the same 2 mm steel and Italian automation EuroSit is included in the design. Even with a closed combustion chamber, the device manages to maintain its level of simplicity, comprehensibility, and dependability.

The only real drawback is that practically all parapet models have an innate issue where the wind blows out the flame, forcing you to manually start the boiler. Furthermore, it occurs far more frequently than with conventional gas boilers. Because of this, even though the Lemax Patriot is among the best parapet boilers, choosing one is usually debatable. We believe that parapet models should be installed in garages, utility rooms, small apartments, or houses intended for short-term occupancy.

Is it worthwhile to think about heating a home or apartment with a parapet gas boiler?

Official website: where to see all models and operating instructions

The manufacturer’s official website in Russia is located at https://lemax-kotel.ru/.

By selecting the "Catalog" menu option, you can view a description and comprehensive technical specifications of every model that is currently available. There is an electronic copy of the instruction manual (also known as the boiler passport) under the "Documents" tab for each model. It contains detailed descriptions of all the features of the device, installation instructions, wiring diagrams, the algorithm for turning it on and adjusting its operation, maintenance features, and clear schematic images.

What model of boiler in the end is better to choose

Ideal, the most well-liked, and possibly among the best available in terms of "price-quality" ratio: energy-neutral floor Lemax Premium featuring a steel heat exchanger. For this amount of money, you can purchase a boiler unit with great build quality, dependability, and performance, but with the most basic functionality, a large size, installation and commissioning requirements, and a service life of two years to ten years.

If funds are not as tight, we advise going with the energy-dependent Lemax Wise or the energy-independent Lemax Leader cast iron models. The first is nearly identical, but it is made of cast iron and is referred to as "Premium." Wise is a costlier but well-made model.

If a closed, space-saving combustion chamber with a coaxial (side) chimney is needed, wall-mounted versions may be of interest. On the other hand, we advise you to consider foreign mounted convection boilers that are priced similarly.

Determining the required boiler output is the primary factor in the decision. The minimal amount of heating equipment power needed for an average suburban Moscow home with two bricks of masonry and a ceiling height of 2.7 meters is determined using the following straightforward rule: one kilowatt for every ten square meters of area. Additionally, a reserve of 15-20% (or 25–30% for two-circuit models) is advised.

For instance, the minimum output needed for the 150 m 2 house mentioned above is 150/10 * 1,2 (20% reserve) = 18 kW.

The result can be adjusted downward by 5–30% if the house is well-insulated (using foam that is at least 10 cm thick) or if it is situated in a warm, southern country.

How to compute the necessary boiler output precisely Formula, correction factors, and individual calculations

How to turn on and light: a brief instruction

If boiler start on energy-dependent models with electronic controls is simple and only requires pressing a few buttons, the boiler start algorithm on budget energy-independent models with EuroSit automatics is more intricate:

1. Before lighting the boiler, make sure that the gas supply tap is open, check the draught in the combustion chamber, e.g. with a match .
2. Turn the mechanical thermostat (rotator) to the "Off-0" position and then counterclockwise as far as it will go, to the "⭐" position.
3. Press and hold the solenoid valve button (start button in the center of the thermostat) for 30 seconds, then press the piezo ignition button near the thermostat once without releasing the start button. At this moment, the ignition burner should light up, if it does not, repeat the steps. If the wick burns steadily, continue to hold the start button for 30-60 seconds, after which it can be gently released.
4. Turning the thermostat, set the desired power level (1 – minimum temperature, 2 – maximum temperature).

Depending on the automation (630 EuroSit, 710 MiniSit, or 820 NovaSit), the controls’ appearance may differ slightly. The operating instructions always include a description of the precise algorithm.

How to switch off the boiler unit completely

1. Turn the thermostat to the "⭐" position. The main burner should be switched off, but the pilot burner (wick) will be burning.
2. To completely shut off the gas supply, turn the thermo regulator knob to the position "Off-0", and then do not forget to close the gas supply tap.

Known malfunctions of Lemax boilers

Serious service complaints for boilers Lemax – a rarity. However, as in the case of any other technique, breakdowns are possible, the most common of them – thermocouple, which converts thermal energy into a weak electric current sufficient for the operation of automation, as well as the draught sensor, necessary to control the draught and emergency stop the boiler in the absence of it.

It is important to remember that replacing the thermocouple is not always necessary. It must be thoroughly cleaned with sandpaper if its contacts are oxidized before rechecking the operation. If not, the heat exchanger’s resource is the only thing that can shorten a boiler’s service life.

Let’s now examine the frequently asked questions, which are typically unrelated to the issue (click to enlarge the response):

There are numerous possibilities, all of which we have previously covered in one of our earlier articles. Back draft, which occurs when the burner flame is blown out in strong gusts of wind, is the most frequent cause. Other common causes include low gas pressure, clogging, and poor draught. This results from mistakes in the chimney’s design: the headband lacks a protective deflector, and the chimney’s overall height and height in relation to the roof ridge are both insufficient.

If you have verified that there is draught and that there isn’t any back draft, the most likely issue is probably an obstructed igniter nozzle. The burner module must be removed in order to disassemble the boiler. The igniter must then be carefully cleaned (blow out or poke a wire through a clogged hole), followed by the burner. Take care not to allow any minor dents or dings in the parts; before disassembling, take a picture of each component’s location.

The piezo igniter is broken if there is no spark when the ignition is turned on, but you should first try thoroughly cleaning all of the contacts with sandpaper.

How to clean a gas boiler on your own: comprehensive guidelines

Maintenance

Like all gas boilers, the requirements for maintenance are fairly basic.

1. Annual inspection of all connections and assemblies of the heating system, the boiler itself, easy cleaning of the burner module.
2. Every 2-4 years it is desirable to mechanically clean the heat exchanger, a feature of Lemax boilers is a removable top panel, making the task easier.
3. Every 4-7 years we recommend to descale the heat exchanger of the boiler.

Everything can be done both on your own and with the help of experts (which is safer and more effective, of course).

Prices: summary table

Model	Heat exchanger material	Available powers, kW	EFFICIENCY, %	Cost, rubles.
Floor standing
Premium	steel	7,5; 10; 12,5; 16; 20; 25; 30; 35; 40; 50; 60; 70; 80; 90; 100	90	23 700-95 000
Leader	cast iron	16, 25, 40, 50	90	60 500-70 000
Wise	cast iron	16, 25, 35, 40 и 50	90	57 000-81 300
Clever	steel	20, 30, 40, 55	90	32 000-75 000
AOGV "Gazovik"	steel	6; 8; 11,6; 13,5; 15,5; 23,2; 29	86	13 800-24 000
Wall
Prime-V	copper	10, 12, 14,

Model	Features
Lemax A1	Compact, efficient, suitable for small homes
Lemax B2	High performance, energy-saving technology

Lemax gas boilers are an attractive option for effectively and efficiently heating homes. Even in the bitterest winters, they keep homes cozy and warm thanks to their cutting-edge technology and dependability.

The energy efficiency of Lemax gas boilers is one of their best qualities. These boilers use the most recent advancements in heating technology to drastically lower energy usage and, in turn, heating expenses. This makes them cost-effective for homeowners as well as environmentally friendly.

Lemax gas boilers are renowned for their longevity and durability as well. They provide homeowners who want a heating system they can rely on for years to come with peace of mind because they are made of high-quality materials and are made to withstand the rigors of regular use.

The simplicity of installation and maintenance is an additional benefit of selecting a Lemax gas boiler. Simple setup procedures and intuitive user interfaces allow homeowners to enjoy hassle-free setup and operation. Routine maintenance is also easy to do, which contributes to the boiler’s long lifespan and best performance.

To sum up, Lemax gas boilers are an excellent option for both heating and insulating homes. Their all-around energy efficiency, robustness, and user-friendliness make them an appealing option for homeowners trying to maintain year-round warmth and comfort in their houses.

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