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Gas central heating at a glance.

Everything you need to know to upgrade your heating system.
Gas boilers

Gas boilers are often a great choice.

Modern gas condensing technology is beneficial in many ways. It suits almost every home, offers high levels of comfort for heating and hot water and involves comparatively low costs and installation effort Additionally, it reduces energy consumption used for heating by up to 30% when replacing old boilers. On this page, you’ll find all relevant information about the different options, functionalities, advantages and costs.

gas boiler

Modernise once to multiply benefit.

From reasonable purchase prices and efficient operation to reduced environmental impacts and lesser space requirements within your home: Gas condensing technology for your heating has a whole set of advantages to it – not only compared to conventional gas and oil heating systems.

  • Highly efficient operation.

    Modern gas central heating with condensing boiler technology makes optimal use of the energy that’s produced during combustion.
  • Reduced emission values.

    Even though gas is mainly a fossil fuel, its use as a fuel creates significantly less environmentally harmful emissions compared to oil-fired heating systems.
  • Space-saving installation.

    The installation of oil heating tanks requires lots of space. As regular boilers can be wall-hung, they’re a particularly space-saving alternative to oil-fired systems.
  • Inexpensive acquisition.

    Compared to other heating technologies, gas boiler prices are surprisingly low. For this reason, they’re the ideal choice when it comes to cost-conscious heating.

We are happy to help you find the suitable gas boiler for you.

Operating principle How does it work.

The operating principle of a condensing gas boiler is rather simple, yet effective: it not only optimally utilises the supplied energy, but also the thermal energy of the flue gas.

In general, burning gas produces heat which is used to heat up water in the boiler. This water is fed through a pipe system into the radiators – which release the heat directly into the room. At the same time, the boiler extracts additional heat from the waste gases by condensing this water vapour to liquid water, thus recovering its latent vaporisation heat. As a result, this heat is also converted into heat that can be used for heating.

Thanks to its maximum use of energy, gas condensing technology reduces both heating costs and emissions.

Different types of gas boilers Fules for gas heating: the different types.

All of our gas devices are gas-adaptive and capable to work with following gas types:

Heating with natural gas.
Your boiler is supplied directly through the gas grid connection and thus provides efficient heat.

Heating with liquified gas.
If your home is off the public gas grid, liquified gas is a reasonable alternative. Using it requires a gas tank that’s installed in your basement or garden – even below ground level to make it almost invisible!

Heating with biogas.
If heating is an environmental matter to you, biogas is the way to go: Obtained from organic waste, it counts as a renewable energy.

The main differences in modern gas central heating systems are size- and performance-related. The different models provide solutions for limited space as well as increased power demand.

The name already hints at the fact that these are appliances space-savingly mounted to walls. Wall-hung boilers are comparatively inexpensive and need connection to a chimney. As they operate independent of room air and in a modulating manner, there’s no need for a constantly opened basement window and the performance adjusts continuously to your heating demand.

As opposed to wall-hung boilers, installation of standing boilers requires floor space of approximately 3 m². Their main advantage is high performance that especially benefits multi-family homes and larger commercial properties. Just like regular boilers, standing boilers need to be connected to a chimney, too, to discharge exhaust fumes.

Gas central heating

Replacement of your current boiler.

Repeating malfunctions, noise pollution, interruptions of the hot water supply or the need for reduced heating costs by means of more efficiency: Reasons for a replacement of your old boiler can be quite different. But it’s always a comparatively small invest and quick solution that provides increased comfort and significant saving potentials on the long run. Our boilers use latest gas condensing technology to increase not only comfort, but also efficiency over conventional systems – reducing heating costs by up to 30% when replacing your old boiler.

Is it time for you to replace your old heating? If so, here you find all the information you need.


How a hybrid system can get your boiler on the next level.

There are different technologies available to be combined with your gas boiler. One very common combination option is gas with a heat pump.

Heat pumps provide warmth in a far more ecological manner – but with limits when it comes to the reachable flow temperature.That’s why their capacities might not be sufficient in every case, like not optimally insulated buidlings. Yet, they’re an ideal choice when combining them with a gas central heating: The heat pump serves as your main heat supplier whenever outdoor temperatures allow for efficient use, while your gas heating system provides sufficient warmth and hot water in all other situations.

Costs of gas replacement Modernising your heating: potential costs and savings.

Whether you want to replace your old boiler or look for the ideal solution in a new construction: Gas central heating systems are generally less expensive than oil heating systems – and a combi boiler is cheaper than a floor standing one. This applies to boiler prices as well as to installation.

Individual costs of a new heating and its operation depend on:

• Price of new boiler and flue gas system

• Costs of installation

Factors that impact running heating costs include fuel consumption, gas prices, living space size, building insulation, heat distribution, and personal perception of warmth.

Modernising your heating system comes with several savings potentials:

• Reduction of fuel consumption and energy costs

• Reduced maintenance effort and costs

  1. How to start the process of finding your own gas boiler
  1. 1

    Find your perfect gas boiler

    Together with a certified partner you analyse your situation and find your future gas boiler.

  2. 2

    Get a free offer

    Your local Vaillant installer provides you with an offer including your specific components and installation costs

  3. 3

    Get your system installed

    Your local Vaillant installer installs your new gas boiler and takes care of your old one. He can offer you a 5 year warranty and a service contract.

  • 1. How can I save heating costs with a gas central heating?

    The easiest way to save on heating costs is to lower your room temperature by 1-2° C:

    Reducing room temperature by a single degree can already save up to 6% of heating costs. Thanks to the higher efficiency of modern gas central heating systems, you can even achieve similar savings without compromising your living comfort.

  • 2. How much does replacing an old gas heating system cost?

    The overall costs of replacing your old gas heating are subject to several factors – from prices of the boiler and its flue gas system to the costs for installation. Our certified installers are happy to provide you with a detailed cost estimate.

  • 3. Where’s the best place to install my new boiler?

    The ideal choice and placement of your new boiler depends on your housing situation: The given space and connections from older heating systems are decisive to determine the boiler that suits your home best. Floor-standing boilers require about 3 m² for installation, while wall-hung boilers can be space-savingly installed in unused niches and corners.

  • 4. How’s constant efficiency and safety of operating my heating system ensured?

    For maximum efficiency and safety, your new appliances should be subject to annual maintenance.

    To have one of our certified partners service your heating system on a regular basis helps to increase its lifespan significantly.

  • 5. Are there different appliances for radiators and underfloor heating?

    Our gas boilers are generally suitable for both, radiators and underfloor heating. How they’re set up depends on your heating type: Compared to older radiator models, gas condensing technology is ideally paired with underfloor heating. This way it offers the same increased efficiency that new low-temperature radiators provide.

  • 6. How do I identify my current Vaillant heating system?

    You should find the type plate with product name either on the appliance’s downside or behind the operating panel flap. If product details aren't specified on the appliance, either look it up in the user manual or get the information from your installer.

Browse through our brochures for all you need to know.

For more detailed information about gas central heating in general or Vaillant appliances, you can download the following brochures.