Viessmann vs Vaillant Boilers – Which is the Best

April 15, 2023 | News

Vaillant VS Viessmann

When it comes to purchasing a new boiler, the decision can be a bit overwhelming as there are many brands available in the market. Among the leading brands, Viessmann and Vaillant are two of the most renowned names in the industry. Here, we will compare both brands and help you choose the best boiler for your needs.

Viessmann vs Vaillant – What’s the difference?

Viessmann and Vaillant both offer a range of boilers that differ in terms of features, specifications, and prices. Viessmann boilers are generally cheaper than Vaillant boilers, but that doesn’t mean they compromise on quality. In fact, the Vitodens 050-w is one of the best-selling combi boilers in the UK, and the Vitodens 100-W is another popular model that receives excellent customer feedback.

On the other hand, Vaillant is a family-owned business and the UK market leader. They are credited with pioneering the combi-boiler and setting standards in the heating market. Their ecoTEC Plus System is well-known for its high-quality components and efficiency.

Viessmann vs Vaillant Boiler model comparison

Before deciding on a specific boiler model, it’s important to determine which type of boiler best suits your needs. Conventional boilers are usually found in older properties and require a lot of space due to two tanks in the loft and a hot water cylinder. The Vaillant ecoFIT Pure Regular is an excellent option for this type of system as it comes with a high-spec aluminium heat exchanger and is controllable via an app.

System boilers, on the other hand, are similar to conventional boilers but require just one tank rather than two. The Vaillant ecoTEC Plus System is a popular choice in this category as it comes in a range of heating outputs, meeting the needs of both small and larger-sized homes.

Combination boilers or combi-boilers are a popular choice in the UK, as they act as both a water heater and central heating unit, requiring no storage cylinders or water tanks. The Vaillant ecoFIT Pure 25kW is an excellent option if space is an issue, as it is small enough to fit into a kitchen cupboard and known for its ease of installation and maintenance. The Viessmann Vitodens 050-W Combi Boiler, meanwhile, is one of the smallest wall-mounted boilers available, achieving top-rated efficiency and up to a seven-year warranty.

Viessmann vs Vaillant – Energy Efficiency

When it comes to energy efficiency, both brands are impressive. The Viessmann Vitodens 050 achieves 92% efficiency under the UK’s Seasonal Efficiency of Domestic Boilers (SEDBUK) scheme, while the Vaillant EcoTEC Pro achieves an A grading under the European system, but with an efficiency percentage of 89.3%. Although both boilers are highly efficient, the Viessmann model has a slight advantage in terms of energy savings.

Best Boiler Warranty – Viessmann or Vaillant

When it comes to warranties, both brands offer 2-10 years as standard, but Viessmann’s Inox-Radial stainless-steel heat exchanger comes with a 10-year warranty. This gives homeowners added protection against future repair bills and pushes Viessmann into first place for the best boiler warranty.

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Which is the most reliable boiler brand – Viessmann or Vaillant?

While it’s difficult to say for sure, both companies have a reputation for producing high-quality and reliable boilers. Ultimately, the reliability of a boiler will depend on a range of factors, such as how well it is installed, how well it is maintained, and how heavily it is used.

However, if we take a closer look at the warranty periods offered by both companies, Viessmann appears to come out on top in terms of reliability. Viessmann offers a 10-year warranty on their Inox-Radial stainless-steel heat exchanger, which is a major component in the boiler. This gives homeowners peace of mind and protection against future repair bills.

On the other hand, Vaillant offers a standard warranty of 2-5 years, depending on which boiler you choose. However, extended warranties of up to 10 years are available if the boiler is installed by an engineer who is trained and accredited by Vaillant. While this may be more expensive, it could provide substantial savings in the long term.

When it comes to feedback from homeowners, both Viessmann and Vaillant boilers have received positive reviews. Trustpilot, for example, scores Viessmann at 4.6/5 and Vaillant at 4.7/5. Ultimately, choosing between the two will depend on your individual needs, budget and preferences.

Price is also a factor to consider when choosing between Viessmann and Vaillant boilers. Viessmann boilers are often cheaper than those from Vaillant, but this does not necessarily mean they are of lower quality. Viessmann has a reputation for producing high-quality, efficient and reliable boilers at an affordable price.

Some examples of Viessmann and Vaillant boiler costs include:

Model Hot Water Output Heating Output Price
Viessmann Vitodens 050-W 35kW 33kW £899.99
Vaillant ecoFIT Pure 835 35kW 35.8kW £1329.99
Viessmann Vitodens 050-W 29kW 24kW £824.99
Vaillant ecoFIT Pure 825 25.2kW 26.5kW £1059.99

As mentioned earlier, the cost of installation will also need to be factored in.

In conclusion, both Viessmann and Vaillant are reputable brands that produce high-quality boilers. While there are some differences between the two, such as warranty periods and prices, both offer efficient and reliable products. When deciding between the two, it’s important to consider your individual needs and preferences, as well as the cost of the boiler and installation.


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