An essential piece of equipment for the home, the gas boiler helps you heat your home and produce domestic hot water at the same time. The most efficient models can save 15 to 20% of energy. But choosing the best gas boiler is not limited to that. In this guide, you will find a selection of the best gas boilers currently available on the market and everything you need to know to make the right choice.
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Our selection
"This temperature-controlled gas boiler reduces your energy bill. Its efficiency of up to 108% guarantees high performance."
"This boiler guarantees you tailor-made solutions, adapted to your requirements. Robust and reliable, it is made of materials that are perfectly resistant to high temperatures."
"With its 24 kW power, this high energy performance boiler guarantees you up to 30% savings. Its sanitary flow rate of 12L/min ensures great comfort…"
"This powerful boiler combines technology and simplicity of operation. With its good efficiency, it helps you save on your energy bill."
"The Saunier Duval Isotwin Condens 25 kW gas condensing boiler is used for both central heating and domestic hot water. You will need to buy…"
This temperature-controlled gas boiler reduces your energy bill. Its efficiency of up to 108% guarantees high performance.
879 £ on ManomanoThe De Dietrich MPX 24/28 MI Compact boiler combines the functions of heating and hot water production. Its integrated electronic box makes it easy to adjust the temperature inside your home. It is equipped with the GCO system (Gas Combustion Optimizer). This system limits polluting emissions while optimizing combustion. The boiler is thus more efficient and safer.
We appreciate its silent operation and its compact size. It can easily fit into small spaces, thanks to its width of 40 cm. It delivers 15.8 L/min of hot water. It can work with natural gas as well as with butane or propane gas.
This boiler guarantees you tailor-made solutions, adapted to your requirements. Robust and reliable, it is made of materials that are perfectly resistant to high temperatures.
630 £ on ManomanoThe Luna St Blue boiler from Chapee can be used as both a heating and hot water system. Its control panel with backlit display offers ease of use. It is efficient and can provide 90% efficiency, which guarantees significant energy savings. The boiler is environmentally friendly, using a blue flame burner. This device reduces NOx emissions, which are particularly harmful to health and the environment.
This boiler guarantees a hot water flow of 11.2 L/min. It takes up little space and can be placed in a kitchen cupboard, shower or laundry room. Perfectly silent, it can be used at any time of the day. Its construction materials make it very robust.
With its 24 kW power, this high energy performance boiler guarantees you up to 30% savings. Its sanitary flow rate of 12L/min ensures great comfort of use.
1 439 £ on ManoManoThe ThemaPlus Condens boiler produces hot water while heating your home. It uses the Microfast technology, which ensures a good stability of the hot water temperature. Thanks to this system, hot water is available from the first tap. Unlike traditional boilers, the ThemaPlus Condens does not turn on between draws. It can provide up to 109% efficiency, which allows you to considerably reduce your energy and heating bill.
In terms of ergonomics, this boiler combines practicality and efficiency, thanks to its intuitive Saunier Duval interface. It has an LCD screen with backlighting, which allows you to consult all the useful information concerning its operation. Discreet and silent, it remains very discreet in a kitchen or shower.
This powerful boiler combines technology and simplicity of operation. With its good efficiency, it helps you save on your energy bill.
880 £ on ManomanoThis Initia Compact HTE 25kW gas boiler from Chappée is an excellent option for domestic hot water production and home heating. Its 108% efficiency guarantees high performance. Delivered with a complete installation kit, it has a flow rate of 12L/min. Perfectly silent, it provides hot water for a family of 4 people.
This boiler uses propane or butane gas. Designed for small spaces, it fits easily in a closet or in a corner of your laundry room. It is equipped with an easy-to-use control panel. The smoke is evacuated using a horizontal or vertical venting system, supplied in the kit.
The Saunier Duval Isotwin Condens 25 kW gas condensing boiler is used for both central heating and domestic hot water. You will need to buy the suction cup, the tap bar and the set of sockets separately.
1 999 £ on ManomanoThe Isotwin Condens Saunier Duval 25 kW gas condensing boiler benefits from the IsoDyn² technology that characterizes the Saunier Duval high-end gas boiler range. Thanks to this technology, this gas boiler can produce hot water with a flow rate of up to 18.5 litres/minute. The hot water is stored in two 21-liter tanks for a total hot water reserve of 42 liters.
It is important to note that this Isotwin Condens 25 kW gas condensing boiler allows huge energy savings. In fact, this model has a useful efficiency of up to 109.2% at 30% load. Finally, it should be noted that thisis an RT 2012 and ERP certified model, enabling it to achieve very high energy efficiency.
Delivered bare, this Initia + Duo CHAPPEE gas condensing boiler stands out for its performance, energy efficiency and exceptional heating comfort.
1 271 £ on ManomanoThe Initia + Duo CHAPPEE gas boiler is a condensing model that uses accumulated tank technology to store water. In fact, it has a 40-liter stainless steel coil storage tank. This model is distinguished by its incredible performance supported by full power modulation. The boiler is fueled by natural gas, but it is possible to run it on LPG with simple modifications.
An automatic 2-speed pump will ensure power consumption in case of problems with the gas supply. This model also has a very user-friendly illuminated control panel. The particularity of this panel is that the failures are displayed in all letters. Thus, the user will be able to know the details of a particular failure.
If you are looking for a De Dietrich gas boiler that is both economical and efficient, the Naneo PMCS should be of great interest to you. It is delivered bare, but accessories are easy to find.
1 051 £ on ManomanoThe De Dietrich Naneo PMCS is above all a high-efficiency boiler. Indeed, it can reach 110%. The savings you can make can be up to 30%. All this is thanks to the modulating burner and the high-efficiency modulating pump, which ensures constant optimization of electricity consumption when the boiler is in operation.
For central heating and sanitary purposes, this gas boiler has an output of 27.5 kW with a nominal output of 23.8 kW. The hot water flow rate can reach 14 l/min. Finally, it should be noted that this model works with both natural gas and propane.
Any specific needs?
The best entry-level gas boiler
Very good Saunier Duval gas boiler
Your guide :
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| TOP OF THE TOP | NOT EXPENSIVE | TOP OF THE RANGE | EXCELLENT | Very good | CHAPPEE | De Dietrich | |
In accordance with our commitment, this buying guide does not contain any sponsored products. |
9/10 |
7/10 |
8/10 |
8/10 |
8/10 |
8/10 |
7/10 |
| OUR SELECTION |
Chaudière à gaz condensation MPX 24/29 MI Slim De Dietrich
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Chaudière gaz Luna St Blue Chappée 24kW
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Gas boiler ThemaPlus Condens Saunier Duval 25 kW
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Chaudière Gaz Condensation Initia + Compact Chappée 25 kW
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Condensing gas boiler Isotwin Condens Saunier Duval 25 kW
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Initia + Duo condensing gas boiler CHAPPEE
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De Dietrich Naneo PMCS condensing gas boiler
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This temperature-controlled gas boiler reduces your energy bill. Its efficiency of up to 108% guarantees high performance.
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This boiler guarantees you tailor-made solutions, adapted to your requirements. Robust and reliable, it is made of materials that are perfectly resistant to high temperatures.
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With its 24 kW power, this high energy performance boiler guarantees you up to 30% savings. Its sanitary flow rate of 12L/min ensures great comfort of use.
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This powerful boiler combines technology and simplicity of operation. With its good efficiency, it helps you save on your energy bill.
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The Saunier Duval Isotwin Condens 25 kW gas condensing boiler is used for both central heating and domestic hot water. You will need to buy the suction cup, the tap bar and the set of sockets separately.
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Delivered bare, this Initia + Duo CHAPPEE gas condensing boiler stands out for its performance, energy efficiency and exceptional heating comfort.
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If you are looking for a De Dietrich gas boiler that is both economical and efficient, the Naneo PMCS should be of great interest to you. It is delivered bare, but accessories are easy to find.
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Power
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29 kW
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24 kW
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30 kW
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25 kW
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25 kW
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20 kW
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27.5 kW
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Expansion tank capacity
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7 liters
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-
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8 liters
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8 liters
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12 liters
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7.5 liters
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-
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Hot water flow rate
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15.8 l/min
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13.7 l/min
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17 l/min
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12.1 l/min
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18,5 l/min
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15.5 l/min
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14 l/min
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Heating/sanitary energy class
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A/A
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C/B
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A/A
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A/A
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A/A
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A/A
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A/A
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Type of gas
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Natural gas, Propane
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Natural gas
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Natural gas, propane
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Natural gas
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Natural gas, Butane, Propane
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Natural gas, Butane, Propane
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Natural gas, Propane
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The low-temperature gas boiler: it gives off heat at around 40°C. There are two techniques, the chimney mode and the flue mode.
The condensing gas boiler: it produces temperatures of around 90°C. It condenses the fumes produced during heating to exploit the heat produced by the water heating.
Thefloor installation is designed for rather large boiler models. It therefore requires fairly spacious premises. This technique is generally used to meet a large heating demand. The wall-mounted boiler, on the other hand, is reserved for smaller premises. It corresponds to more modest heating needs. It is usually used for dwellings without a special location, basement, or annex. There are models designed to be housed in very small spaces. It is also possible to separate the elements of some boiler models to distribute them in two different rooms.
The heat output required for a boiler will be calculated according to the volume of the rooms to be heated. The power required will be expressed in watts (W) or kilowatts (kW). Insulation can vary the calculation of heating requirements. Energy loss and the External Temperature Index ITE also play their part in calculating the power required from a boiler.
It is expressed in percent. It is the ratio between energy production and consumption. The higher the percentage, the more economical the boiler. It varies according to the techniques used for the different types of gas boilers. For low temperature gas boilers, the efficiency is 90%. These boilers require little money to purchase. In use, the savings compared to conventional boilers are about 20%. Condensing boilers have an efficiency of over 105%. Their price is higher than that of other boilers, but their gas consumption is by far the most advantageous. It leads to 30% savings compared to conventional boilers, and 10% compared to low-temperature gas boilers.
Heating with a gas boiler causes the emission of smoke. This phenomenon can cause various inconveniences. There are specific rules to follow, with regard to your own safety. When using a low-temperature gas boiler with a chimney, it is essential to ensure that the air in the heated room is constantly renewed. The room should therefore preferably be open. It is also important to respect the neighbourhood. The fumes must be evacuated at a height. The discharge will be done by observing a certain distance from your doors and windows, and at a respectful distance from the neighboring houses.
How does the condensing gas boiler work?
In a condensing gas boiler, the gas heats the water of the central heating system, just like in a conventional boiler. The main difference between the two techniques is the fate of the smoke.
In an ordinary gas boiler, the fumes are simply guided to a flue. The gas condensing boiler will use these fumes to transform them into a heat source.
The flue gases released by the heating process contain water vapor. The boiler will condense these vapors. The heat emitted during this operation will be recovered by the boiler. The water is then evacuated through the wastewater systems.
The gas condensing boiler: many forms of use
The gas condensing boiler can be wall-mounted, for a modestly sized home, where saving floor space is an important consideration. In larger homes, or those with a garage or basement, the floor standing boiler is the most practical solution.
The gas condensing boiler can be connected to all hot water distribution systems. In general, it works with town gas. It can also be fed from a tank.
For good results, it is wise to add a hot water tank to the boiler. The boiler will be placed on the tank, which will reduce the space required.
Characterized by a very high efficiency, up to 105%, even 110%, the condensing gas boiler is based on a system of preheating water to obtain a steam that will then heat the contents of the boiler. The combustion of the gas is the result of this reaction. Once the water vapor starts to condense, it goes out with the wastewater.
With this system, the energy saving reaches 30% compared to the old boiler model. Moreover, the condensing gas boiler is the most popular option for the French at present. Especially since it is an investment that benefits from state aid for financing.
The temperature produced by this boiler is around 40 °C. Its operation has not changed from the first models put on the market. Although, it knows a certain improvement in terms of energy performance. It is less expensive than the gas condensing boiler and thus seduces a good handful of households in search of a good heating equipment.
This low temperature allows for palpable savings. At the same time, thermal comfort is assured. In short, it is a good compromise for small budgets, although we are gradually trying to promote the condensing boiler. Besides, the efficiency provided does not reach 100%.
It is a gas boiler that heats with a high temperature that is between 60 and 80 °C. Impossible to make savings with this model. It is also the oldest gas boiler and it gives an efficiency of 80%. It is the least efficient and the most energy consuming.
Nevertheless, it is very efficient in terms of speed of heating. The gas combustion is used directly, which explains this high temperature. This equipment is however quite versatile. It heats radiators, but also all sanitary waters.
The ionic boiler, or electrolysis boiler, heats by ionization. This technique is distinguished by the fact that it does not use gas or other heating substances. The ionic boiler does not require any resistance since this role is played by the water in the circuit.
The electricity circulates in a loop, with electrons being projected at a speed of about 28 km/s. These movements cause friction which gives rise to magnetic waves. These waves, in turn, agitate the water, causing it to heat up.
The system has two circuits. The primary circuit generates the ionization, with a water slightly added of bicarbonate. The secondary circuit is the heating/hot water circuit. It collects the energy via a plate heat exchanger.
Cogeneration is a system that provides both heat and electricity from a single energy source. When used on a small scale in a single-family home, it is called micro-cogeneration. This boiler produces hot water for sanitary purposes, heating and electricity.
The cogeneration boiler can run on wood, oil or gas. It generally uses the principle of condensation, with in addition a Stirling engine which will make function an alternator to obtain electricity. This movement releases heat that the boiler will recover to transform it into domestic hot water and heating.
The ionic boiler is an interesting option if you are looking for a fuel-free equipment. By opting for the micro-generation boiler you will be able to produce your own energy, while benefiting from an efficient heating system.
Energy saving
Unlike other types of boilers, gas boilers work by recycling the heat in the combustion fumes and sending it directly into the heating circuit. Since this energy is free, you can save on your bill if you use a condensing model.
Versatility
Gas is suitable for all types of boilers, whether conventional, condensing or low-temperature. You can also use it to supply your home. It is also cleaner than other fuels like coal or wood. This saves you from having to clean all the time and increase your household chores even more.
Heating comfort
Since it is centrally heated, the heat from the gas boiler is more even and better distributed. This is a significant advantage compared to other types of heating such as electric heating. It uses different technologies and works with natural gas without any problem. This makes it very easy to use.
Space saving
You won't have to buy gas cylinders if you are connected to the natural gas in the area where you live. Your home is automatically refuelled and the conductors are all built into the walls. The gas boiler is also the least bulky solution on the market, as you won't have to dedicate a space to store fuel. Its compact size means that it can easily be placed in any corner of your home and you can install it yourself, without the need for professional help.
Easy to maintain
Gas heaters require no special maintenance. All you need to do is have your boiler inspected by a professional once a year to maximise its lifespan. You can also clean the central heating system with soap and water if necessary.
In our opinion, the best brands of gas boilers in 2022 are :
This French brand joined the BOSCH group in 1996. ELM LEBLANC is specialized in the field of heating systems and in particular in boilers for domestic use. The products of this brand are designed and assembled in the UK. We classify without hesitation the products of this brand under the sign of the permanent innovation and the respect of the environment.
French brand created more than a century ago and member of the BDR Therméa group, CHAPPEE offers thermal comfort solutions adapted to its customers. We appreciate the user-friendliness and practicality of the products marketed under this brand.
ATLANTIC products have existed since 1968. It is a brand of French design and manufacture. In the field of domestic thermal solutions, we recognize the know-how and experience of this company and welcome its very competitive offers in terms of quality-price.
The De DIETRICH brand includes French companies in the pharmaceutical and chemical industries as well as in the household appliance and heating sectors. It has proven itself over three centuries of existence. We particularly appreciate its efficient and elegant solutions in the field of thermal comfort.
With the arrival on the market in the 1960s of the first wall-mounted combination boilers, the French brand SAUNIER DUVAL distinguished itself with its SD 216 model. Since then, it has continued to contribute to the development of thermal comfort by investing in innovative projects to satisfy its customers. We admire the sustained efforts of the brand to offer competitive and good quality products.
The diagram below will help you to get an idea of the typical prices for each price range (entry-level, mid-range and high-end).
However, more expensive does not necessarily mean better.
We therefore advise you to always consult our ranking before deciding, rather than blindly relying on price ranges.
Insulate your pipes
Prevention is better than cure, so consider insulating your heating ducts to avoid heat loss. Remember to do this before winter arrives. Most home improvement stores sell inexpensive lagging material that can be installed in minutes.
Turn off the boiler and save money
Once
the weather warms up, you can turn off your boiler. If you have a combination boiler, you can simply turn it on "hot water only" and turn off the heat. But to avoid problems when winter returns, it's best to turn on your boiler once a month for 15 minutes during the summer.
Keep the pressure on
Boilers don't work properly when the pressure is too low. The correct pressure is between 1 and 1.5 bar. This is easy to check, as there is a dial on the front of your boiler. If you need to adjust it, be sure to consult your manual.
Clean your boiler
Over time,
sludge can build up in your boiler system, which will naturally affect its efficiency. You can have it thoroughly cleaned by a professional who will use a strong detergent. This will remove all the sludge and debris from the pipes and ducts. You'll get maximum heat at a lower cost. It also helps extend the life of your boiler.
Perform periodic maintenance
Boilers need to be serviced regularly. Remember to take care of it regularly, your boiler will last longer and run more efficiently. For extra care, call a heating service technician. And take the opportunity to check your boiler's safety and performance and make any necessary repairs.
The best gas boiler depends on your needs and your budget. Read our buying guide to find out which products are the best at the moment.
The boiler must be serviced every year. It is advisable to carry out the maintenance before the heating period.
Boiler maintenance is a legal requirement for safety reasons. If you do not comply with this obligation, you will not be covered by insurance in the event of an accident.
The technician checks the safety devices. He also cleans the extractor, the heating body, the burner and the pilot light. The professional issues a maintenance certificate at the end of the service.
Maintenance ensures a longer life for your equipment. During the overhaul, the professional checks for possible malfunctions, which are often responsible for accidents.
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