Gas boiler test & comparison 2023

Recommended heating boilers: Our top 5 items in the comparison test

Gas boiler: If you are looking for an efficient way of heating, a gas boiler could be the perfect choice for you. This heat source uses gas to generate heat, making it a cost-effective option. The big advantage of a gas boiler is the space saving, as it is very compact and space-saving compared to other heating systems. In addition, gas boilers are very reliable and durable. However, regular maintenance is necessary to ensure optimal performance of the gas boiler. So if you are looking for a reliable and space-saving option, consider a gas water heater.
Best recommendation
Gas boiler Wolf CGB-2 24 kW gas condensing boiler condensing
Price-performance winner
Gas boiler Thermona combi boiler 20 kW calorific value boiler
Gas boiler Buderus gas wall boiler Gas heater GB 172 24 kW
Gas boiler Buderus GB182 Buderus Logamax plus GB182 i 24 kW
Gas boiler Wolf CGB-2 14 kW gas condensing boiler condensing
Gas boiler Buderus gas condensing heating boiler GB 172
Gas boiler Evenes gas condensing boiler ITACA model KR, KR-32
Gas boiler Max Weishaupt GmbH Weishaupt Thermo Condens
Gas boiler Gas condensing combi boiler CGB-2K 24
Gas boiler Buderus Logamax plus GB182i 24 kW black
ModelGas boiler Wolf CGB-2 24 kW gas condensing boiler condensingGas boiler Thermona combi boiler 20 kW calorific value boilerGas boiler Buderus gas wall boiler Gas heater GB 172 24 kWGas boiler Buderus GB182 Buderus Logamax plus GB182 i 24 kWGas boiler Wolf CGB-2 14 kW gas condensing boiler condensingGas boiler Buderus gas condensing heating boiler GB 172Gas boiler Evenes gas condensing boiler ITACA model KR, KR-32Gas boiler Max Weishaupt GmbH Weishaupt Thermo CondensGas boiler Gas condensing combi boiler CGB-2K 24Gas boiler Buderus Logamax plus GB182i 24 kW black
BrandWolfThermonaBuderusBuderus Gb182WolfBuderusEvensMax Weishaupt GmbHWarmefuxx.comBuderus
The Best productscoreprice.com1,5Very good!Gas boiler
Price-value for moneyscoreprice.com2,0goodGas boiler
TOP Productsscoreprice.com1,6goodGas boiler
TOP Productsscoreprice.com1,7goodGas boiler
TOP Productsscoreprice.com1,8goodGas boiler
TOP Productsscoreprice.com1,9goodGas boiler
TOP Productsscoreprice.com2,1goodGas boiler
TOP Productsscoreprice.com2,2goodGas boiler
TOP Productsscoreprice.com2,3goodGas boiler
TOP Productsscoreprice.com2,4goodGas boiler
max. heat output at 80/60 °C24 kW20 kW24 kW24 kW15,2 kW19,5 kW30,4 kW13,7 kW24 kW24 kW
Efficiency110% Hi92% Hi106% Hi109% Hi110% Hi109% Hi106% Hi103% Hi92% Hi93% Hi
approved gas formsNatural gas, LPGnatural gas, propaneNatural gasNatural gas, LPGNatural gas, LPGNatural gas, LPG, propaneNatural gas, LPGNatural gasNatural gasNatural gas, LPG
Weight33 manufacturer informationno manufacturer informationno manufacturer information33 kg.43 kg.40 kg.41 kg.37 kg.43 kg.
exhaust connectionno manufacturer's informationno manufacturer's informationID 60/100no manufacturer's informationID 60/100ID 80/125ID 80/100ID 80/125DN 130no manufacturer's information
floor standing | hanginghanginghangingHanginghanginghanginghanginghanginghanginghanginghanging
max. hot water temperature75 ° C60 ° C65 ° C60 ° C90 ° C60 ° C62 ° C60 ° C80 ° C60 ° C
Height | width | depth790 x 440 x 378 mm725 x 430 x 300 mmno manufacturer informationno manufacturer information790 x 440 x 378 mm840 x 440 x 350 mm750 x 420 x 315 mm520 x 792 x 335 mmno manufacturer information840 x 440 x 360 mm
max. amount of hot water9 l / min8 l / min20,3 l / min9 l / min10 l / min9 l / min16 l / min11,4 l / min16,1 l / min9 l / min
max. hot water output at 80/60 °C24 kW20 kWnot specified22,5 kW13,5 kW23,8 kW33,4 kW15,1 kW24 kW24 kW
  • especially for low emissions
  • self-calibrating combustion control
  • expandable and therefore future-proof standard operating values
  • very high
  • especially for low emissions
  • self-calibrating combustion control
  • with modulation from 24 to 100%
  • also suitable for operation with propane gas
  • timed soot removal function
  • simple operation of the heating control with touch screen
  • can be integrated into solar systems
  • Easy to use
  • particularly low-emission WILO high-efficiency pump
  • with energy-saving
  • expandable with the control panel for more functions
  • particularly high ease of use
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The best gas heaters in the test & comparison:
Choose your test winner from our top recommendations.

Laura is a passionate online shopper and e-commerce expert with a passion for fashion, tech, pet supplies and health & beauty. She likes to share her experiences and recommendations with others.

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Gas boiler 2023: Comparisons and valuable tips for your purchase decision can be found here.
Purchasing a gas boiler is easier if you follow our recommendations. In this guide you will find all the essential information.

At a glance
  • A gas boiler is one Heating, which runs on gas and provides hot water and heating for a building. It is very efficient and environmentally friendly compared to other heating systems. A high energy yield and low CO2 emissions are the advantages of a modern gas boiler.
  • Gas boilers are available in different sizes and can be installed to supply small apartments or large buildings depending on the needs. In contrast to the boiler, they work as a combination device, which saves space. Gas heaters are also very reliable and have a long service life.
  • There are different types of gas boilers, such as atmospheric or condensing boilers. Combination boilers can also take over the hot water preparation. Maintenance and regular inspection by a professional is essential to ensure safe and efficient use.
Gas boiler

Everything about the gas boiler: the most important questions at a glance

With the increasing popularity of gas boilers in many households, numerous questions arise about this topic. Sure, you want to know what you're getting yourself into, don't you? So, let's take the time to clarify the five most burning questions about gas boilers.

How reliable are gas boiler tests and gas boiler comparisons?

Tests and comparisons, especially from renowned institutes or specialist magazines, are certainly reliable sources. These often offer an objective and comprehensive evaluation of various models. The “gas boiler test” usually takes into account criteria such as efficiency, safety and ease of use. The “gas boiler comparison”, on the other hand, usually compares different models directly so that you as a customer can quickly see the advantages and disadvantages. It is advisable to use several sources to get a holistic picture.

What does a “gas boiler with digital control” bring?

A “gas boiler with digital control” has a number of advantages. With a digital control panel, the temperature can be precisely adjusted and even programmed in time. This means that you go into a preheated one at a certain time in the morning Bathroom could come if that's not even something! In addition, some models can be controlled via an app, giving you access to the thermal bath from anywhere. The digital control also enables better diagnosis of possible errors, making service easier.

Is it worth investing in a “gas boiler with solar support”?

Oh yes, she does! A “gas boiler with solar support” combines the best of two worlds. While sunny days are used to produce warm water using solar cells, the gas boiler kicks in on cloudier days or at night. This not only saves energy costs, but is also environmentally friendly. With rising gas prices, investing in such a combination can definitely be worth it in the long run.

What should you consider with a “gas boiler for natural gas operation”?

A “gas boiler for natural gas operation” is the most common form of gas boiler. When purchasing, you should make sure that the model is suitable for the type of natural gas available in your area. There are differences between natural gas H and natural gas L. It is also advisable to pay attention to the efficiency of the heater and to take advantage of any funding options. Of course, the ongoing costs for natural gas should not be forgotten.

Are there gas boilers for other types of gas?

Sure, there is! In addition to natural gas, gas boilers can also be operated with liquid gas or biogas. Liquefied gas is particularly interesting in regions where there is no natural gas network. Biogas, on the other hand, is a more environmentally friendly alternative. However, not all gas boilers are suitable for every type of gas. Before purchasing, you should therefore carefully check which type of gas the heater is designed for.

Maintenance is key!

Believe me, a gas boiler needs to be looked after. Regular maintenance not only ensures efficient operation, but also safety in your home.

Our gas boiler recommendation on Amazon:

Wolf CGB-2 24 kW gas condensing boiler condensing gas boiler heating boiler gas heating
  • WARNING: Safety-relevant component, installation only by authorized specialists!

Different gas boilers and their features

Gas boiler typecharacteristics
condensing boilerAlso uses water vapor to generate heat, very efficiently
Low temperature thermalWorks at lower temperatures, good for underfloor heating
Combination heatersHeating and hot water preparation in one device
Air-independent thermal bathObtains combustion air from outside, safer indoors

Not all fuel is the same!

Depending on where you are stay, natural gas, LPG or biogas could be the best option. Before purchasing, find out what gas is available in your area.

Pros and cons of gas heaters


  • Energy efficient and environmentally friendly
  • Cost-effective to operate
  • Fast and even heat distribution
  • Flexible installation options


  • Acquisition costs may be higher
  • Requires regular maintenance
  • In the event of malfunctions, the heat supply can be affected

The question of space!

Depending on the model, a gas boiler needs more or less space. So think carefully about where it should be. Basement or attic? Every place has its advantages and disadvantages.

Gas boiler

Alternatives to gas boilers

Electric heating

Yes, some people like things simple and straightforward. It heats when it has electricity. Sounds good, but the catch is that it is usually more expensive to operate.

Oil heating

An old friend, right? Many cellars in Germany still house a large oil tank. Reliable, but oil prices can be pretty tricky.

pellet heating

Wood pellets as fuel – a more environmentally friendly option and quite in Fashion came. But you need space for the pellet supply.

Heat pumps

Draw heat from air, water or the ground. Mega-efficient and environmentally friendly, but the acquisition costs? Oof!

How are gas boilers actually tested?

Of course, you want to know how a gas boiler performs in the test. First the safety is checked – pretty important if you ask me. Then the efficiency. How much gas does the thermal bath need and how much heat does it spit out? And then of course the general operation. Does it run quietly? What about maintenance? Lots of things like that.

Where and how was tested?

So, the renowned magazine “Energie & Heim” carried out a large gas boiler test in June 2022. The Gas boiler test winner? The “EcoHeat Super” from HeatMaster. They got a grade of 1,3 for this. Not bad, right?

Test approaches from specialist magazines

The professionals in the magazines don't just look at numbers and data. No, they also check how easy the installation is or what the customer service is like. Sure, high efficiency is great, but what if the heater fails and no one helps?

Stiftung Warentest and gas boilers

Now things get tricky. Stiftung Warentest last tested gas boilers in 2019. The exact Gas boiler test winner I can't find it right now, but it's best to look directly on their website.

The big players in the industry

So, of course there is Vaillant and Buderus. Everyone knows them. Then Junkers, Viessmann and Wolf. All brands that you basically can't go wrong with.

And the bestsellers?

HeatMaster is at the top with the “EcoHeat Super”. But the “Vitodens 300-W” from Viessmann is also extremely popular.

Where do you get a gas boiler like that?

Good question! Online You can look at shops like Heizendiscount24 or Thermondo. Offline? Your local plumbing and heating retailer will be happy to advise you. And of course, before you buy, look for one Gas boiler purchase recommendation. Better safe than sorry!

Why gas boiler? Good question!

Who doesn't want to sit comfortably warm in their own home in winter while the snow falls outside? Gas boilers are real workhorses here: they are usually quite efficient and can operate at a good rate Gas boiler offer also do a lot for your wallet. And if we from Gas boiler bestseller When we talk about models, we mean models that have proven themselves over the years.

What should you know?

There are a few things you simply need to know about gas boilers. Firstly: Regular maintenance is the be-all and end-all. It's like with a car: check it out once a year. Secondly: Not every gas boiler is suitable for every house or apartment. Sounds logical, right? And thirdly: Don't save at the wrong end. A good gas boiler can easily last for 15 years or more.

Our gas boiler bestsellers on Amazon:

Bestseller no. 1
GASLAND BE158B 6L Gas Water Heater, Freestanding Tankless Gas Water Heater with Portable Handle, Instant LPG Water Heater,...
  • ➤Hot water on demand. The Gasland BE158 gas water heater delivers 6 L/min of endless hot water to any...
  • ➤CE certified. The 6L tankless water heater complies with CE certified GAR standard for the whole EU market....
  • ➤Easy installation: The gas water heater comes with a standard 5-15kg LPG bottle (not included)...
Bestseller no. 2
20LPM gas instantaneous water heater, 40KW propane gas instantaneous water heater with super low 0,1 bar starting water pressure, operated with LPG for ...
  • 【Bigger but Faster】 - Adopts 4 x 500mm torches aimed at thickened pure copper pipes to 20 LPM (+25 ℃) ...
  • 【Super low water required】 - Only 0,1 bar water pressure required makes hot water all day for showering and ...
  • 【Easy to use】 - 3 rotary knob design: switch winter / summer mode (40% energy savings in this mode), ...
DiscountBestseller no. 3
BreeRainz 16LPM gas water heater, 32KW propane gas water heater with shower head, suitable for butane/LPG/propane, super low...
  • 【Excellent Performance】Made of high quality pure copper tube and burner. Can quickly provide cold water in 2,5...
  • 【Low pressure start】Newly upgraded ultra low pressure start, even when the water pressure is at 0,1PSI, it has ...
  • 【Easy Operation】Equipped with 3 buttons: burner control, gas control and hot water control. It can be 40%...

Gas boiler conclusion

If you do your research, choose the right model for your needs and focus on quality, then you really can't go wrong with a gas boiler. Sure, the market is big and sometimes a bit confusing, but that's like with everything: Eyes let's go shopping!

  1. Which brand is your personal favorite gas boiler?
  2. How often do you have your gas boiler serviced?
  3. What was the main reason for you to choose a gas boiler?
  4. Did you buy your gas boiler on special offer?
  5. which Gas boiler offer has really convinced you recently?
  6. Which features are particularly important to you in a gas boiler?
  7. If you were to buy a new gas boiler, what budget would you have in mind?
  8. What do you think of the current ones? Gas boiler bestseller models?
  9. Have you ever had to use a repair service for your gas boiler?
  10. How important is environmentally friendly combustion in your gas boiler to you?

Youtube video recommendation for the gas boiler comparison:

Gas boiler poisoning – how to avoid the invisible danger | Market Check SWR


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Which of the manufacturers has been given a place in their gas boiler comparison?

For this gas boiler comparison, we limited ourselves to a number of important manufacturers in the ranking. You can see models from the following manufacturers here Wolf, Thermona, Buderus, Buderus Gb182, Wolf, Buderus, Evens, Max Weishaupt GmbH, and Buderus with a representative selection of the best products.

How inexpensive or expensive are the gas boiler products that were presented in comparison?

In our Gas boiler In comparison, you can find excellent and high quality Gas boiler Products whose maximum price is up to about 3.710,47 € can be. However, we also have cheaper alternatives for you about 1.211,00 €.


Which product received the price-performance winner seal in the gas boiler comparison?

Our editorial board members agreed that the Gas boiler Thermona combi boiler 20 kW calorific value boiler from the gas boiler comparison earned the seal for the item with the best price-performance ratio.

Which gas boiler products were used by the editorial team for comparison?

How did the editorial team rank the Gastherme articles?

Our research is based on expertise and objectivity. We are not influenced by the industry, manufacturers or media. In our gas boiler comparison, only customer experiences, our own test results and reviews from Stiftung Warentest led to this assessment: it received 1st place Gas boiler Wolf CGB-2 24 kW gas condensing boiler condensing, followed by Gas boiler Thermona combi boiler 20 kW calorific value boiler, Gas boiler Buderus gas wall boiler Gas heater GB 172 24 kW, Gas boiler Buderus GB182 Buderus Logamax plus GB182 i 24 kW and Gas boiler Wolf CGB-2 14 kW gas condensing boiler condensing.

What other top products were selected in the gas boiler comparison?

There were various top products to choose from, but not everyone was able to win our comparison or the one with the best price-performance ratio. Even if they weren't included in the grading, they are among the bestsellers, like  Gas boiler Wolf CGB-2 24 kW gas condensing boiler condensing, Gas boiler Thermona combi boiler 20 kW calorific value boiler and also Gas boiler Buderus gas wall boiler Gas heater GB 172 24 kW.

Further links and sources too gas boiler

  • Wikipedia: More information about the Gas boiler can be found on Wikipedia, a well-known free encyclopedia on the Internet.
  • Youtube: Look on Youtube to learn more about Gas boiler to experience.
  • Amazon: Discover the variety Gas boiler products on Amazon.
  • ebay: has a large selection of other products for Gas boiler Products.

How did you like our gas boiler comparison?

4.3/5 - (35 reviews)

  1. Luke Keller says:

    How efficient is the gas boiler?

    1. Customer Support - Advisor says:

      Hello Luke Keller,

      We really appreciate your comment on our gas boiler comparison. Thank you for taking the time to give us your opinion!

      The efficiency of the gas boiler depends on various factors such as the model, installation and maintenance. However, modern gas boilers are usually very efficient and can achieve a high level of efficiency. It is recommended to choose a model with a high energy efficiency class and to have regular maintenance carried out to ensure long-term efficiency.

      From us in the support team: Greetings to Belgern-Schildau.

  2. Bundle says:

    Do I need a chimney for this gas boiler?

    1. Customer Support - Advisor says:

      Hello Demet,

      We really appreciate your participation in our gas boiler test & comparison. Your feedback is of great help to us. Thanks!

      A gas boiler does not require a classic chimney because it is equipped with an exhaust pipe. This safely directs the exhaust gases outside and enables flexible installation.

      Greetings and wishes for a nice day from the sales team for Friedrichskoog!

  3. Jan Winters says:

    How often does the water in the gas boiler have to be replaced?

    1. Customer Support - Advisor says:

      Hi Jan,

      We really appreciate your comment and your interest in our gas boiler test & comparison. Thank you!

      The water in the gas boiler should be replaced at least once a year to ensure optimal heating. To extend the service life, we also recommend regular maintenance by a specialist.

      Best regards to Ober-Ramstadt.

      support specialist

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