We have made gas technology to perfection.
The first step to more efficient heating.
Vaillant gas condensing boilers offer a reliable heating solution to increase the efficiency of your heating and reduce your heating costs at the same time. They heat your home quickly and evenly by converting a large proportion of the energy from the burnt gas into heat. Plus, they are compatible with various gas types and some can even be operated with hydrogen. The following information will give you a good overview of whether a gas condensing boiler is the right heating solution for you.
Advantages of Vaillant Gas Boilers
Small device, big impact.
- Efficient and reliable technology.
For over 150 years, we've combined proven technology with high efficiency and powerful performance in our gas boilers, ensuring you enjoy warmth without worry.
- Double the efficiency, half the worry.
Opt for a hybrid heating system by pairing a heat pump with a gas boiler, ensuring energy-efficient, eco-friendly warmth and reliability for your home.
- Ready for green gases.
Prepare your home for the future. Our condensing boilers are compatible with bio-natural gas and bio-LPG. Some can even be converted to run on 100 % hydrogen.
- Tailored warmth with tailored savings.
Cost-effective and space-saving, our versatile gas boilers fit perfectly in any home, offering efficient warmth for the budget-conscious.
How gas boilers work
The power of condensing technology.
Gas condensing boilers operate with a straightforward, efficient approach. They use gas to heat water, which is then circulated through your home's radiators and hot water supply. By recovering heat from flue gases, these boilers effectively lower heating costs and emissions. Modern systems enhance efficiency with condensing technology (see illustration below), capturing heat from both gas combustion and the water vapour in flue gases. Unlike non-condensing systems where this vapour escaped through the chimney, condensing boilers reclaim this heat, extracting more warmth from the same fuel.
1. Gas burner: By mixing gas and air, we create an inflamable gas mixture, which can be burnt to create heat.
2. Heat exchanger: The heat exchanger transfers the generated heat to the water in the heating system. This warm water is fed into the heat distribution system via the pipes.
3. Heat distribution system: The heat distribution system acts like another heat exchanger. It transfers the heat from the water to the ambient in your home. During this process the water cools down again.
4. Condensing heat exchanger: The cooled water that returns to the boiler is used in the condensing heat exchanger. Here, it helps capture extra heat from the flue gases. As the water vapor in the gases cools down, it turns back into liquid water, releasing additional heat. This process allows the boiler to recover more energy, making it even more efficient.
Types of gas boilers
Find the ideal Vaillant boiler for your home.
Gas boilers come in two types, each offering unique benefits and the option for expandable storage. Decide which is right for your home: floor-standing or wall-mounted. For hot water preparaton, you can also choose between direct hot water preperation or the use of a separate storage.
Wall-hung gas boilers.
Wall-hung gas boilers, such as our , are a smart, space-saving choice, designed to be mounted at the wall. They require a chimney connection, ensuring efficient operation. These boilers are not only cost-effective but also adapt their output to meet your home's heating needs. As they are working independently of room air, there is no need for a permanently open window.
Available as standalone heating appliances or as combi boilers with integrated hot water preparation, they maximise space efficiency. For homes with higher hot water demand, consider adding a hot water cylinder heated by the gas boiler to ensure highest comfort.
Floor-standing boilers.
Floor-standing gas boilers, such as our , require a floor area of about 3 m² for installation. Known for their high output, they are ideal for apartment buildings and larger commercial properties, needing a chimney connection to discharge exhaust gases.
These boilers can serve as compact units for heating and hot water or be paired with a cylinder. Compact appliances are especially suitable for flats and small houses, offering heating and hot water preparation in one device.
Reliable heating solutions for modern homes
The right boiler for every situation.
- 1/3Wall-hung boiler gas, condensing, combiecoTEC plusIdeally suitable for replacements in existing buildings.Get more details
Ideally suitable for replacements in existing buildings.
- Automatic adaption to fluctuating gas types and qualities
- Future-proof sustainability ready for up to 20% of hydrogen
- Extendable with renewables like solar, thermal, or photovoltaics for even more efficient heating
- Easily connected to myVAILLANT connect internet gateway via plug and play for smart heating
- Handy monitoring with our new design and operating concept
Especially in existing buildings with gas grid connections, our ecoTEC plus boilers are a swift and the most popular solution to replace old gas boilers ecologically and efficiently: Made of a material that's 80% recyclable, they're easily installed using the given connections, provide reliable quality and can even utilise up to 20% of hydrogen for outputs of 10-30 kW – making it a future-proof choice that can reduce consumption and operating costs.
- 2/3Wall-Hung Boiler Gas, Condensing, CombiecoTEC introWall mounted gas condensing combi boiler for heating and hot water.Get more details
Wall mounted gas condensing combi boiler for heating and hot water.
- Meets essentials needs of heating and hot water comfort
- Ideal replacement solution for old boilers
- Compact dimensions and minimalistic design
- High energy efficiency offered by the condensing technology
- High quality at a reasonable price
The ecoTEC intro is a gas condensing boiler that combines heating and hot water in one device. It is one of the smallest and lightest wall-mounted gas condensing boilers in the market and the perfect solution for an apartment size of approx. 80 m2. The LED boiler display and the touch buttons allows you to easily adjust your heating profiles or set the temperature to your liking. It offers high quality at an attractive price. Operating costs are low, as it uses up to 30% less energy than older heating systems.
- 3/3Compact Boiler Gas, Condensing, Shift-Load-CylinderecoCOMPACTFloor standing gas condensing boiler including hot water tank.Get more details
Floor standing gas condensing boiler including hot water tank.
- Elegant and compact design with a footprint of just 0,41 sqm
- Heating and hot water preparation in one device
- Saves gas and electricity due to self-optimizing condensing technology
- Energy-and therefore cost-saving type of hot water cylinder
- Can be controlled via app as an option
Whether it's a larger apartment, a single-family home, or a multi-family house - you'll always make a good choice with the ecoCOMPACT VSC. A domestic hot water cylinder with a capacity of 90, 150 or 200 litres is integrated in the modern gas condensing boiler, so you can enjoy high heating and hot water comfort. With its sleek appearance the ecoCOMPACT cuts a fine figure even in the living area because all components are hidden inside the unit's housing. Our ecoCOMPACT is energy saving not only because of its hot water cylinder, in which less water is continuously heated but also because its high-efficiency pump automatically reduces its output when heat demand is low.
Frequently Asked Questions
Still have questions? We have the answers.
In relation to the adjusted efficiency, this is approx. 86% for a gas non-condensing boiler and approx. 96% for a gas condensing boiler, which corresponds to a difference of 10% less gas consumption; higher efficiencies are also possible under good system conditions