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Vaillant Boiler Reviews, Prices and Pros + Cons (2025)
- The price range of a Vaillant boiler is £1,015 - £2,470 in the UK.
- Vaillant manufactures combi, system and conventional boilers in the ecoTEC plus, ecoTEC exclusive, ecoFIT pure, ecoTEC pro, and ecoFIT sustain product lines.
- Vaillant has a Trustpilot rating of 4 out of 5.
Vaillant is a major player in the European heating, ventilation, and air conditioning industry, with an experience spanning over 150 years. The innovative German brand, based in Remscheid, is known for manufacturing some of the best boilers in the UK that cater to a wide range of heating needs, without compromising on energy efficiency.
In this comprehensive guide, you can read about the different boiler product ranges offered by Vaillant, their costs, and pros and cons. This way, you can determine if a Vaillant boiler is the right fit for your home.
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Which Vaillant boiler is the right fit for you?
The Vaillant product line includes the ecoTEC plus, ecoTEC exclusive, ecoFIT pure, ecoTEC pro, and ecoFIT sustain. All of these models are gas condensing boilers with an ErP energy efficiency rating of ‘A’.
| Boiler range | Types available | Energy efficiency rating | Warranty |
|---|---|---|---|
| ecoTEC plus | Combi, system, conventional | A | 5 years (can be extended to 10 years) |
| ecoTEC exclusive (with Green iQ) | Combi and system | A | 5 years (can be extended up to 10 years) |
| ecoFIT pure | Combi, system, conventional | A | 2 years (can be extended to 10 years) |
| ecoTEC pro | Combi | A | 2 years (can be extended to 7 years) |
| ecoFIT sustain | Combi | A | 2 years |
*Terms apply to extended options. 10-year guarantee when installed and registered with a boiler protection kit by a Vaillant Advance installer. 7 years when installed by a Vaillant Advance installer.
The ecoTEC plus and ecoFIT pure ranges offer combi, system, and conventional boilers, suitable for small, medium, and large households. For example, combi boilers are good for smaller homes with up to 2 bathrooms, and system and conventional boilers are ideal for large households with 4+ bedrooms and up to 20 radiators.
The ecoTEC exclusive range has combi and system boilers ideal for large houses or houses with high heating and hot water requirements. This range also has the Green iQ feature, which helps the boiler adjust itself to give only the exact heating output required. This results in lower gas consumption and lower energy bills. The ecoTEC pro and ecoFIT sustain ranges provide combi boilers that are good for smaller houses.
Vaillant boiler prices in the UK
Vaillant boilers price range from £1,015 to £2,470 (excluding installation), which makes it a mid to premium range brand. To put this into context, the cost of a new gas boiler for more affordable brands like Biasi is £635 to £750. However, boiler prices are influenced by the type of boiler, fuel type, and output size. Installation costs can add around £1,000 - £2,000 to the final cost.
Generally, combi boilers are the most popular boiler type because of their versatility and affordability. Vaillant offers combi and storage combi boilers, and the price range of a Vaillant combi boiler is between £1,015 and £2,470. The costs for the best combi boilers offered by Vaillant are detailed in the following table.
| Model | Outputs available (kW) | Fuel type | Cost (supply only) | Suitable for |
|---|---|---|---|---|
| ecoTEC plus | 26, 32, 36, 40, 40* (*storage) | Gas/LPG | £1,650 - £2,470 | Medium to large-sized households |
| ecoTEC exclusive (with Green iQ) | 35, 43 | Gas | £1,970 - £2,400 | Medium to large-sized households |
| ecoFIT pure | 25, 30, 35 | Gas | £1,245 - £1,760 | Medium sized-households |
| ecoTEC pro | 24, 28, 30 | Gas/LPG | £1,015 - £1,640 | Small to medium-sized households |
| ecoFIT sustain | 25, 30, 35 | Gas | £1,400 - £1,700 | Medium-sized households |
The price range of Vaillant system boilers is £1,145 - £2,100. System boilers come with an additional hot water storage cylinder and are appropriate for houses with 2 or more bathrooms with high heating and hot water demand. The table below features the costs of different system boilers manufactured by Vaillant.
| Model | Outputs available (kW) | Fuel type | Cost (supply only) | Suitable for |
|---|---|---|---|---|
| ecoTEC plus | 10, 15, 20, 25, 30, 35 | Gas/LPG | £1,145 - £2,100 | Small, medium and large-sized households |
| ecoTEC exclusive (with Green iQ) | 27 | Gas | £1,770 - £1,895 | Large sized-households |
| ecoFIT pure | 12, 15, 18, 25, 30 | Gas | £1,270 - £1,830 | Small, medium and large-sized households |
Vaillant conventional boilers cost around £1,065 - £2,135. Conventional boilers, also called regular or heat only boilers, provide heating and hot water with the help of an additional cold water feed tank (typically placed in the loft) and a hot water cylinder.
This storage setup is ideal for homes that require a large amount of hot water or have multiple bathrooms. However, conventional boilers are only recommended as direct replacements. Homes with 2+ bathrooms should consider a system boiler first. The following table showcases the conventional boiler models manufactured by Vaillant.
| ecoTEC plus | 12, 15, 18, 24, 30, 35 | Gas/LPG | £1,100 - £2,070 | Medium and large-sized households |
| ecoFIT pure | 12, 15, 18, 25, 30, 35 | Gas | £1,110 - £2,240 | Medium and large-sized households |
While these prices are a good estimate, it is always a good idea to contact an installer to get an accurate idea of the investment required. Thankfully, you do not have to worry about finding reliable installers on your own.
With GreenMatch’s seamless service you can get up to 3 quotes to compare and choose from. And the best part? It is a completely free service. All you need to do is fill out a short questionnaire.
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Vaillant boiler reviews: How are they rated?
Vaillant is one of the most trusted boiler brands in the UK, with a Trustpilot rating of 4 out of 5. Around 78% of the reviews are 5-star reviews, with the customers praising the customer service and the boiler quality. Apart from great customer reviews, Vaillant boilers have received other accolades as well.
The brand’s entire domestic boiler range received the ‘Best Buy’ status from Which? In 2020, for manufacturing some of the most efficient boilers with advanced technologies. Moreover, Vaillant was named ‘Brand of the Year’ in the ‘Energy and Heat’ category in a survey conducted by a research organisation in Germany in 2024. Another survey conducted by Cint & Selvitys consumer panel named the company ‘Brand of the Year’ in 2025, for the third time in a row in Belgium.
Vaillant boilers pros and cons
The main advantages of Vaillant boilers are reliability and high energy efficiency. The following section discusses the rest of the advantages and disadvantages in detail.
- Energy-efficient modulation: All of the gas condensing boilers provided by Vaillant are rated ‘A’ on the ErP scale. Some models, such as the ecoTEC plus, have high modulation ratios as well (1:10), which means that they are able to adjust their heat output to precisely match the heating requirements, rather than running at full power at all times. The Green iQ range of boilers is designed to adjust for optimum performance by monitoring gas combustion.
- Reliability: Vaillant boilers are recipients of several awards for their product and engineering quality. The company conducts rigorous testing from product development to series production. Great industry reputation, efficient boilers, and good customer support makes Vaillant a reliable boiler brand.
- Quiet mark accreditation: Most of Vaillant’s boilers have the ‘Quiet Mark Accreditation’, which means that they are great for indoor installations.
- Smart controls: The myVAILLANT app allows remote control of the boiler and optimisation of the heating schedule. Smart home integration, weather control, and intelligent learning are some of the features that enhance user experience.
- Wide range of models: Vaillant provides a solution for every household. There are compact combis for smaller houses and more powerful conventional and system boilers for houses with high heating and hot water demand. Additionally, ecoFIT pure and ecoTEC pro are the more affordable ranges compared to the premium ecoTEC plus and ecoTEC exclusive product ranges.
- Expensive: Vaillant boilers are comparatively more expensive than other brands on the market. For example, other premium brands like Worcester Bosch and Viessmann have more budget friendly options starting at £700-£800. The high upfront cost along with the installation costs can be a lot for homeowners on a budget.
How long do Vaillant boilers last?
Vaillant boilers last up to 10 to 15 years with proper maintenance. To extend the lifespan of the boiler, the following steps can be taken.
- Annual service: A yearly boiler service from a Gas Safe Registered engineer is important to spot problems early and to ensure the boiler keeps on running smoothly. This can cost between £70 and £130, or between £14 and £27 per month if you take out a service plan.
- Corrosion prevention: Sometimes, adding an inhibitor can prevent corrosion. If you think your boiler is susceptible to corrosion-related damage, this protective coating can help prevent corrosion and the buildup of limescale.
- Prevention of sludge buildup: It is a possibility that debris and sludge builds up inside the pipes over time. As a preventive measure, a magnetic filter can be installed to filter out sludge in the boiler system. This can cost around £100 to £300.
- Powerflush: For older boilers that have problems related to sludge buildup, a powerflush can be the solution. This process, which costs between £450 and £800, lasts 8 hours to 2 days, and can significantly extend the lifespan of the boiler.
How does Vaillant compare to other notable brands?
The decision to invest in a boiler is a significant one, and it is prudent to compare all the best brands on the market. The following table compares Vaillant to other popular boiler brands in the UK.
| Feature | Vaillant | Viessmann | Biasi | Worcester Bosch | Alpha | Baxi |
|---|---|---|---|---|---|---|
| Price | £1,015 – £2,470 | £700 – £3,555 | £635 – £750 | £800 – £3,800 | £650 – £1,250 | £650 – £3,000 |
| Warranty | 2 to 10 years | 2 to 12 years | 2 to 7 years | 10 to 12 years | 7 to 13 years | 2 to 10 years |
| Trustpilot rating | 4/5 | 4.4/5 | 3.5/5 | 4.6/5 | 4.7/5 | 4.6/5 |
* Prices are estimates only based on current market data. Please note that when comparing, some brands include gas, oil, LPG and electric boilers, while others do not. For an accurate quote, speak to a qualified engineer.
Vaillant is one of the most expensive brands on this list; however, they do not offer oil or electric boilers, which other brands do, which makes their higher-end costs much higher. The warranty is shorter than most of the other brands, and the Trustpilot score is lower as well. But, the warranty length is competitive, with a reasonably good extended offer, and the Trustpilot score is 4, which is not the lowest here, but does give them a 'good' overall user rating.
Are Vaillant boilers good for your household?
Vaillant boilers are known for their reliability, smart features and superior build quality. The brand offers different options suitable for different heating needs. The upfront costs can be a significant investment, but the dependable performance can offer peace of mind.
So, are you ready to upgrade your heating system? The best way to do so is by talking to an experienced installer. You do not have to spend countless hours searching and calling random installers to get the best deal. Simply use GreenMatch’s form to answer a few questions and get connected to up to 3 verified local installers for free.
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