How to choose an energy-independent gas boiler

For comfort and efficiency, selecting the appropriate heating system for your house is essential, particularly when it comes to gas boilers. The concept of energy independence has gained popularity recently, leading many homeowners to look for alternatives to conventional grid-connected systems. An energy-independent gas boiler is one such choice; it provides the comfort of gas heating without requiring outside energy sources. But how do you choose the best model for your needs when there are so many different models and features available?

It’s important to know what makes energy-independent gas boilers different from conventional boilers before getting into the specifics of selecting one. Energy-independent boilers, as opposed to conventional boilers, are able to function independently because they use technologies like propane or LNG storage. Traditional boilers depend on a steady supply of gas from the grid. This independence offers more flexibility in remote or off-grid areas in addition to peace of mind during power outages.

The first step in choosing an energy-efficient gas boiler is to determine how much space you need for heating and how much energy you use. Take into account elements like the local climate, your home’s insulation, and the quantity of rooms that need heating. This assessment will assist in determining your boiler’s suitable heating capacity and efficiency rating, guaranteeing peak performance and economy.

Next, it’s critical to investigate and contrast various energy-independent gas boiler models and brands. Seek for features that can improve efficiency and lower energy consumption, such as condensing technology, modulating burners, and smart heating controls. To guarantee dependability and longevity, take into account additional elements like warranty coverage, customer feedback, and the manufacturer’s reputation.

When selecting an energy-independent gas boiler, installation and maintenance are also important factors to take into account. Some models may offer do-it-yourself options for homeowners with mechanical aptitude, while others may require professional installation due to their complexity or specific requirements. Inquire about routine maintenance schedules and local service technician availability as well to guarantee the longevity and seamless functioning of your heating system.

Consider Energy Efficiency Check the energy efficiency rating of the gas boiler to ensure it will effectively heat your home while minimizing energy waste.
Size Matters Choose a boiler that is appropriately sized for your home"s heating demands to avoid inefficiencies or inadequate heating.
Assess Installation Costs Factor in installation costs when selecting a gas boiler, including any necessary modifications to your home"s infrastructure.
Look for Reliability Research the reliability and durability of different gas boiler models to ensure a long-lasting and dependable heating solution.
Consider Maintenance Needs Choose a gas boiler with low maintenance requirements to minimize ongoing costs and hassle.
Explore Fuel Options Consider gas boilers that can utilize alternative fuels, providing flexibility and potential cost savings over time.

A key component of creating a more sustainable and energy-efficient home is choosing the appropriate gas boiler. Choosing an energy-independent gas boiler reduces reliance on outside power sources and offers more control over energy expenses and consumption in addition to ensuring dependable heating. Careful consideration should be given to various factors when selecting a boiler, including size, fuel type compatibility, efficiency ratings, and environmental impact. Making an informed choice also necessitates evaluating the compatibility with current heating systems and the amount of long-term maintenance required. With efficiency, sustainability, and compatibility as top priorities, homeowners can take a big step toward a more environmentally friendly and self-sufficient heating system for their homes.

What are the energy-independent gas boilers

The gas boiler unit’s technical specs indicate energy independence, which means it doesn’t need to be connected to the power grid. The most basic boilers have a very rigid and basic furnace control system, and the bare minimum of safety features are mechanically operated. Nearly all of the functionality and efficiency of energy-dependent models are realized by more sophisticated contemporary models.

Heat conversion powers the automation of contemporary models. As gas burns, heat is released, feeding a thermocouple that turns the heat into electricity. This method yields enough current to power advanced automation, which not only allows for more precise boiler regulation but also ensures the boiler’s stability and safety.

Energy-independent boilers, however, can only be utilized in systems with natural coolant circulation (the presence of an expansion tank at the highest point, boiler supply and return are at a slight slope of 2-3%) because the energy generated by fuel combustion is insufficient to power the circulation pump.

Boilers that are energy-independent can be single- or double-circuit, and they can supply the home’s hot water supply (DHW). The models that run off of electricity are typically floor standing. However, there are parapet boilers that are made to fit in apartments and tiny spaces; we will still take their features into account when deciding on a boiler.

Principle of operation

The primary burner and igniter keep the combustion going. To guarantee gas combustion and heat carrier heating in the heat exchanger, the corresponding button must be held in order to ignite the igniter, which in turn ignites the main burner.

The main burner is turned off and the gas supply is cut off when the temperature set by the mechanical regulator (thermostat) is reached (the igniter burns constantly). The main burner ignites and heats up as soon as the temperature begins to drop because the thermocouple’s current triggers the electromagnet, which keeps the burner’s gas supply open.

Boilers for safety come with a draught sensor; if there is not enough draught or none at all, combustion products build up and heat the draught sensor, which causes the burner’s gas supply to be cut off.

Reviews of gas boilers operating without electricity: advantages and disadvantages

Advantages Disadvantages
Independence from the power supply, which ensures stable heating of the house Less accurate and less stable temperature maintenance compared to the full-fledged work of automation and flame modulation
Simpler and more reliable design, lack of expensive automatics that can fail Lack of some functions (operating program, weather dependence, etc.).д.), lower level of safety due to the lack of multifunctional automatics.
Savings on the absence of additional energy costs. There is also no need to install a UPS and voltage stabilizer. A chimney with a strong enough draught (creating a vacuum of 16-20 Pa in the furnace) is required for operation, otherwise a draught sensor will be triggered, cutting off the gas supply.
Easier installation and connection For boilers with an open combustion chamber it is recommended to have ventilation in the room
Often quieter operation due to the absence of circulation pump, turbines, fans and other active elements. Often lower (by 1-5%) efficiency compared to energy-dependent boiler units

In what cases its use is unjustified

First off, using an energy-efficient boiler is inconvenient in large homes larger than 150–160 m³, as it is nearly hard to arrange a regular natural coolant circulation in such spaces. Installing a generator, UPS, and energy-dependent boiler (a 1 kW generator is usually sufficient) is a better solution.

Furthermore, it is not justified to install a non-volatile gas boiler in the gas mains at low pressure. Residential building main pressure is typically 50 millibars, though it can occasionally drop or be lower in some areas. Non-volatile models must operate with a minimum main line pressure of 13–15 mbar.

How to choose an energy independent boiler

The market is flooded with energy-independent boilers, making selection difficult. International models are more cost-effective, dependable, and efficient. Domestically produced energy-independent gas boilers are more reasonably priced and require less upkeep because they are tailored for residential use. You can select a model by considering the important factors that are outlined below.

Single-circuit or double-circuit

Single-circuit boilers are made specifically for heating, but two-circuit boilers can simultaneously heat sanitary water for the kitchen and bathroom. Two-circuit boilers are slightly more expensive. It should be noted that low-power models with high hot water consumption (up to 10–12 kW) may not always be able to maintain the temperature within the designated range.

Floor or wall mounted

Since non-independent boilers are typically floor standing, they must designate a separate space big enough to house the boiler and its piping. However, there are also models that are parapet-mounted and conditionally wall-mounted. The boiler must be positioned in the sill space, not above the window sills, although they can be mounted on the wall or the floor. A great option for an apartment is a parapet boiler unit.

Convection holes in the body of Parapet energy-independent boilers allow them to heat the space in which they are installed. Such units only need a side coaxial chimney; a conventional powerful chimney is not necessary.

Type of combustion chamber

Traditional floor-standing non-independent gas boilers, which run on electricity and need a conventional vertical chimney, have an entirely open combustion chamber because they don’t use a fan or turbine. They require electricity to operate if the combustion chamber is closed.

The air intake and combustion product removal from the solely closed (hermetic) combustion chamber of parapet boiler units occurs through the exterior wall of the dwelling.

Material of the heat exchanger

It’s crucial to consider the heat exchanger’s material when making a decision. Heat exchangers made of steel and cast iron are the most widely used. A cast-iron heat exchanger takes longer to heat up but also noticeably longer to release heat due to its thicker walls and increased corrosion resistance. Their service life is at least 20–25 years, compared to 8–10 years for steel ones.

At the same time, steel heat exchangers typically last 15 to 17 years in practice when used properly and maintained with clean coolant. The heavier weight and higher cost of cast iron designs are their drawbacks.


The ratio of resources used to heat produced is displayed by the efficiency coefficient. Although gas boilers can have incredibly low gas consumption (0,6-0,7 cu. m/hr. m/hour), their efficiency is inefficient, ranging from 78 to 80%. As a result, it is required to simultaneously look at two parameters. Excellent values are defined as 1-1.9 cubic meters of gas consumed per hour at an efficiency of 89-92% for a boiler with a capacity of 12-16 kW. Therefore, it is better if the efficiency is higher.

How to select a room thermostat to reduce monthly heating costs by up to 30%

Minimum required capacity

The most crucial factor is the boiler output, which is determined by the house’s area and heat loss. It could be argued that this isn’t the main reason, though, since most models are represented by variations with varying capacities (e.g., the boiler can be used in a variety of ways). 10, 12, 16, 24, and t.д.). Т.е. After selecting the model, its capacity is frequently selectable.

For non-professional calculations, a very basic method is used to determine the minimum required capacity: depending on the region and the house’s heat loss, every 10 m 2 of space requires 1 kW of boiler unit capacity plus 15-20% reserve. This method works well for figuring out how much heating each person in a private home can use.

How to determine the necessary output of a boiler Formula, correction factors, and individual calculations

The best known manufacturers and models: characteristics and prices

Boilers made by foreign manufacturers are thought to be more dependable and efficient. Nonetheless, the cost of boiler units manufactured in Russia is still reasonable, and the quality is continuously rising.

Floor standing

Protherm Wolf 16 KSO

Floor-mounted, 16-kW gas boiler that uses no energy. It is among the best energy-independent gas boilers for heating a private home, especially considering its low cost. Its efficiency of 92.5% at the ideal gas consumption of 1.9 cubic meters per hour for 16 kW models makes it one of the most efficient models. It is simple to install and use, with standard mechanical controls, and includes a draught stabilizer.

Owners observe that the boiler operates almost silently and that no significant malfunctions have been reported since the boiler installation procedure.

In the Russian market, Protherm is well-known for the dependability of its boiler units. We would like to remind you that the water circuit’s maximum permitted pressure is one bar. This indicates that the boiler’s application is limited to systems that have an open expansion tank and natural circulation.

Protherm Bear 20 TLO

An additional dependable 18 kW model from the Slovak manufacturer Protherm. It can operate on liquefied gas and has a lower efficiency of 90% with a gas consumption of 2.14 m 3 per hour. has a premium cast-iron heat exchanger with all of its benefits; it works well in the low-temperature heating mode. In actual use, it can provide up to 210–220 m 2 of heat for homes. During the installation practice, no design or automation issues were found. The weight of ninety kg and the price are the only drawbacks.

Baxi SLIM EF 1.22

Strong Italian floor boiler with a 22 kW capacity and a cast iron heat exchanger, ideal for heating a 230–240 m 2 home. Although its efficiency indicator is only 88%, it still boasts excellent automatic safety features like safety valves, overheating protection, and gas control. Aesthetic appearance and more affordable price for powerful cast-iron boilers are two benefits.

Beretta Avtonom 18

An additional well-known Italian energy-independent boiler with 18 kW of power in Europe. Its design is similar to that of the Baxi SLIM EF and it features a cast iron heat exchanger. The boiler’s design remains centered on safety, while also being quieter than earlier iterations (burners ignite smoothly and smoothly). With an efficiency of up to 93%, the model has a low gas consumption for the power of 18 kW, or 1.94 m 3 /hour.

It’s advised to always have a spare part on hand because thermocouple failure after 8–12 years of operation is a known issue. Additionally, the boiler requires careful maintenance and chimney design; otherwise, "blowing" may occur in high winds. Nonetheless, there are instances of trouble-free operation from 2006 to 2008 with skillful arrangement and steady maintenance works.

Siberia 11

Excellent and reasonably priced domestic choice for up to 120 m 2 of small private homes. The boiler’s 90% efficiency and economy (1.18 m3/hour) are the main reasons it ranks highly among energy-independent boilers. has the most straightforward and dependable design possible. The models have the familiar and easily understood Evrosit automatic controls found on the majority of residential boilers.

An overview of Siberian gas boilers One of the most dependable boilers for homes

Parapet (conditionally wall-mounted)

ATON Compact 12,5E

With a capacity of 12.5 kW and an optimal efficiency of 90%, this energy-independent gas boiler from Parapet uses little gas (1.39 cubic meters per hour). characterized by a very low cost, quiet operation, and durability and dependability. In actuality, the boiler has harsh operating conditions and needs to have its chimney cleaned on a regular basis—ideally once a year.

The average cost is 17,000 rubles.

Lemax Patriot-16

Despite having a slightly lower efficiency of 87%, this 16 kW domestic boiler unit is characterized by its extremely low power consumption of 0.95 cubic meters per hour of natural gas. With correct installation and maintenance, the boiler’s straightforward and dependable design won’t need to be fixed for at least a few years. It is appropriate for installation in the kitchen because of its comparatively quiet operation.

Prices: summary table

Model Power, kW EFFICIENCY, % Gas consumption, cc. m/hour Material t-ka Cost, rub. Our assessment (0-5)
Floor standing
Protherm Wolf 16 KSO 16 92,5 1,9 Steel 21 000 4,4
Protherm Bear 20 TLO 18 90 2,14 Cast iron 79 000 4,2
Baxi SLIM EF 1.22 22 88 2,64 Cast iron 64 000 4,6
Beretta Avtonom 18 18 93 1,94 Cast iron 60 000 4,8
Siberia 11 11,6 90 1,18 Steel 22 000 4
ATON Compact 12,5E 12,5 90 1,39 Steel 17 000 4,5
Lemax Patriot-16 16 87 0,95 Steel 27 000 4,4

Making the right choice in energy-efficient gas boiler is essential for any homeowner trying to maximize the efficiency of their heating system. The emphasis on sustainability and energy efficiency is growing, and choosing the correct boiler can have a big influence on comfort and the environment.

Efficiency is one of the main factors to take into account when selecting a gas boiler. High Annual Fuel Utilization Efficiency (AFUE) ratings indicate how well a boiler converts gas into heat, so look for models with these ratings. Over time, lower energy consumption and lower heating expenses are associated with higher AFUE ratings.

To make sure the boiler suits your needs, take into account the boiler’s size and heating capacity as well. Boilers that are too small might have trouble producing enough heat, while those that are too big might cause inefficiencies and wasteful energy use.

The kind of venting system the boiler needs is another crucial consideration. Energy-independent boilers provide a variety of venting choices, such as sealed combustion and direct venting, which can increase efficiency and safety by bringing in outside air for combustion.

Additionally, give preference to boilers with cutting-edge features like thermostats that can be programmed and burners that can modulate. By adjusting the heat output in response to demand, modulating burners maximize energy efficiency and preserve constant comfort levels throughout the house. Personalized heating schedules are possible with programmable thermostats, which increases efficiency even more.

Finally, don’t undervalue the significance of correct installation and ongoing maintenance. Professional installation guarantees the boiler runs safely and effectively, and regular maintenance extends its life and keeps expensive repairs away. Long-term financial savings can be achieved by making an investment in high-quality installation and maintenance services.

In conclusion, careful consideration of features, installation, maintenance, size, efficiency, venting, and other aspects is necessary when choosing an energy-independent gas boiler. You can take advantage of consistent warmth and energy savings for many years to come if you give priority to these factors and select a boiler that fits your home’s heating requirements and sustainability objectives.

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Sergey Ivanov

I like to help people create comfort and comfort in their homes. I share my experience and knowledge in articles so that you can make the right choice of a heating and insulation system for your home.

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