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Last updated: 8th April, 2024


Vaillant Ecotec Pro Review

Vaillant Ecotec Pro Review

Key takeaways

  • Vaillant Ecotec Pro combi boilers offer versatility and efficient performance.
  • The range includes models suited for various home sizes with user-friendly features.
  • They deliver cost savings on energy and are backed by effective maintenance support.

Vaillant's Ecotec Pro combi boiler series is renowned for providing efficient heating and hot water to homes without the need for a separate water tank.

The Vaillant Ecotec Pro series represents a line of combi boilers that combine high efficiency with compact design. These boilers are engineered to meet the heating and hot water needs of a variety of homes without consuming excessive energy. With their ease of use and installation, the Ecotec Pro range has become a favoured choice in the UK household market, well-regarded for its reliability and performance.

Part of their appeal lies in the variety of models available in the range, suiting different property sizes and demands. From the streamlined Vaillant Ecotec Pro 24, suited for smaller homes with one bathroom, up to the more robust options like the Pro 28 and Pro 30, designed for larger spaces, there is a model to fit most domestic settings. 

Advanced features include quiet operation, user-friendly controls, and smart thermostat compatibility, all of which contribute to a comfortable and cost-effective home heating system.

Maintaining these boilers is also facilitated by a well-structured service regime, which, coupled with their A-rated energy efficiency, ensures lower heating bills and a lesser environmental impact. However, while the initial cost might be a consideration, the long-term savings and reliable functionality effectively provide value for money, making the Ecotec Pro a solid investment for savvy homeowners.

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Overview of Vaillant Ecotec Pro combi boiler-

Vaillant's Ecotec Pro combi boiler series is renowned for providing efficient heating and hot water to homes without the need for a separate water tank. This range exemplifies the precision engineering expected from Vaillant, a respected name in the heating industry. A highlight of the Ecotec Pro line is the thoughtful design allowing for installation in compact spaces, making it suitable for homes where square footage is at a premium.

Specifications of the Ecotec Pro boilers vary between models. For instance, the Ecotec Pro 28 features a flow rate of 11.1l/m, effectively supplying heat to a standard-sized home with up to 12 radiators. On the other hand, the Ecotec Pro 30 model is characterised by its slightly larger dimensions (720mm x 440mm x 340mm); yet, it remains a compact choice, especially when compared to some alternatives on the market.

Users looking for a combi boiler that is even more space-conscious may consider the Vaillant ecoFit Pure 825. However, should they require a similar flow rate to the Ecotec Pro 28, the Worcester Bosch Greenstar 28CDi Compact is a comparable alternative.

The Ecotec Pro combi boilers utilise modulating technology, which conservatively adapts energy usage to the immediate heating demand. This approach ensures that heating is delivered efficiently and only when needed. Furthermore, the Ecotec Pro models underscore Vaillant's commitment to producing premium-grade gas boilers that balance price with performance, and reliability with innovation.

Vaillant Ecotec Pro combi boiler Key Features and Technologies

Engineered for efficiency and reliability, the Vaillant Ecotec Pro combi boiler boasts a range of features and technologies that stand out in the market. This carefully designed system addresses various household heating and hot water requirements with a compact size that fits in standard kitchen cupboards.

Energy Efficiency

The Vaillant Ecotec Pro is applauded for its energy-efficient performance, adhering to the ERP directive with an ErP 'A' grade rating. This combi boiler utilises a modulating pump to reduce electricity usage and ensure optimal efficiency during operation. The range includes models from 24 to 30kW, suitable for various property sizes.

Heating and Hot Water Performance

Reactive to instantaneous hot water demand, Vaillant Ecotec Pro boilers deliver central heating output with precision. Their modulating technology is designed to ramp up swiftly to meet heating or hot water needs, and then scale down efficiency as demand wanes, preventing energy wastage.

Noise Levels

Vaillant’s commitment to noise reduction has resulted in the Ecotec Pro achieving Quiet Mark status. This accreditation underscores the combi boiler's operation at low noise levels, therefore contributing to a tranquil home environment.

Smart Controls and Connectivity

Including innovative controls such as the VRT 350 or VRT 50 thermostat, alongside compatibility with Vaillant’s vSMART smart thermostat, the Ecotec Pro offers advanced connectivity. These smart controls allow users to manage heating systems remotely for added convenience and energy savings.

Compact Design and Dimensions

With dimensions of 720mm x 440mm x 340mm, the Vaillant Ecotec Pro can be easily accommodated within most kitchen cupboards, similar in size to the Vaillant ecoFit Pure 825. Its compact size makes installation and maintenance both simple and discreet.

Warranty and Manufacturer Support

Vaillant offers a standard 7-year guarantee which can be extended when registered through Vaillant Advance. This robust warranty, along with the manufacturer’s reputation, adds peace of mind for owners in terms of support and service.

Accreditations and Awards

The boiler’s exceptional performance has not gone unnoticed, earning it the prestigious Which? Best Buy award. Such accolades reaffirm Ecotec Pro’s stellar reputation amongst both consumers and industry experts.

Ecotec combi Product Range and Models

The Vaillant Ecotec combi range offers three main models tailored to different home sizes and needs, each with distinctive output and efficiency levels. These combi boilers are designed to provide both central heating and hot water without the need for additional hot water storage tanks.

Vaillant Ecotec Pro 24

The Ecotec Pro 24 is ideally suited for smaller properties, such as those with up to 3 bedrooms and a single bathroom. It has a central heating output of 18.9kW and is known for its compact size, making it an unobtrusive fit in most kitchens or utility spaces.

Vaillant Ecotec Pro 28

For medium-sized homes requiring a tad more power, the Ecotec Pro 28 presents a viable option. It offers a flow rate of 11.1 litres per minute, which is adequate for homes with up to 12 radiators. Its higher capacity ensures that hot water is readily available, even in busier households.

Vaillant Ecotec Pro 30

The Ecotec Pro 30 combi boiler is part of the upper range in terms of capacity. It measures 720mm x 440mm x 340mm, fitting into most standard kitchen layouts. This model caters to slightly larger homes that demand more from their heating systems.

Comparisons with Other Models

Vaillant's Ecotec Pro boilers face competition from models such as the Vaillant ecoFit Pure 825 and the Worcester Bosch Greenstar 25Si Compact. The ecoFit Pure 825 is an even more compact option in this segment, while Worcester Bosch offers a similar level of energy efficiency and reliability.

Combi vs System and Regular Boilers

The Ecotec combi boilers are a compelling choice for homes without the space for separate hot water tanks. In contrast, system and regular boilers can be more suitable for properties with multiple bathrooms, as they utilise a tank to avoid pressure drops during high demand. The 'I series' — Vaillant's system and regular boilers — provides alternative solutions for those with different requirements.

Each Ecotec model bears an ErP 'A' rating for energy efficiency, with performance levels reaching up to 94%. This can translate to lower heating bills and a reduced carbon footprint for the user. Combining this level of efficiency with the convenience of a combi system places these boilers competitively in the market.

Installation and Setup

Navigating the installation and setup of a Vaillant ecoTec Pro boiler is straightforward when approached with the correct knowledge and preparation.

Installation Process

For homeowners, the Vaillant ecoTec Pro series proves less daunting to install than one might expect. A qualified Gas Safe registered engineer is imperative to ensure a secure and compliant setup. In particular, ecoTec Pro models offer ease of access with removable side panels, streamlining the process. However, it's pivotal that the installer adheres to all manufacturer guidelines to maintain the product's warranty and operational efficiency.

Installation Costs and Considerations

Installation costs can be varied and typically hinge on the scope of the job. The price usually starts from £2,200, including VAT. Yet details such as the complexity of the pipework, the condition of existing connections, and access for the installer can affect the final quotation. Before commencing, homeowners should discuss clear cost outlines with their chosen Vaillant Advanced Installer, who may deliver more accurate estimates after a site survey.

Boiler Positioning and Mounting

EcoTec Pro boilers are compact enough to be housed neatly within standard kitchen cupboards, measuring in at 720mm x 440mm x 338mm. Proper mounting is critical; the boiler should be affixed securely to a wall that can support its weight. Points of consideration include clearance around the unit for maintenance and compliance with building regulations concerning ventilation and flue placement.

Pairing with Radiators and Thermostats

Coupling the Vaillant ecoTec Pro with radiators and a thermostat system finalises the setup. The model handles varying numbers of radiators efficiently, ensuring a consistent heating experience. Compatibility with smart thermostats such as Nest and Hive allows for further control and energy savings. Users should engage with their engineers to map out an optimal configuration that suits the heating demands of their space.

Maintenance and Servicing

Regular upkeep is pivotal for the longevity and efficiency of the Vaillant ecoTec Pro gas boiler. Owners should consider the boiler's well-regarded reliability, understand their servicing commitments, and utilise Vaillant's customer support to maintain optimal performance.

Routine Servicing

Routine servicing, essential to ensure the boiler operates at peak efficiency, involves a series of checks and cleans. A typical service for the Vaillant ecoTec Pro series may include:

  • Inspection of the boiler and controls to ensure they are functioning properly.

  • Checking for corrosion and leaks in the system.

  • Cleaning the boiler's heat exchanger.

  • Reviewing the gas pressure and flow.

  • Flue test to confirm no unsafe emissions.

Vaillant recommends annual servicing to uphold the boiler's reliability, and servicing by a Vaillant Advance installer can ensure adherence to warranty conditions.

Manufacturer Support and Customer Service

When unforeseen issues arise, Vaillant provides robust support to its customers. The manufacturer's warranty on the ecoTec Pro series — usually covering a period between 2 to 5 years — can be extended if the installation is done through a Vaillant Advance installer. This partnership ensures that genuine Vaillant parts are used and the highest servicing standards are maintained.

For ongoing support, Vaillant's customer service can be reached through a dedicated helpline, offering assistance and advice on maintenance. Additionally, Vaillant makes it easy to book a service visit online, providing customers with a user-friendly interface and peace of mind.

Energy Savings and Efficiency

The Vaillant ecoTec Pro range offers significant energy savings and efficiency, reflecting in reduced carbon emissions and lower energy bills. Performance meets environmental consciousness without compromising on user comfort.

Reducing Carbon Footprint

The ecoTec Pro boilers are designed to minimise wasted energy and, consequently, the homeowner's carbon footprint. They boast high efficiency levels, with the ecoTec Pro 30 model, for example, having an energy efficiency rating of an A (89.3%) under the ErP directive. Reducing energy waste is not only beneficial for the environment but also aligns with the current push for greener, more sustainable living.

Understanding Efficiency Ratings

Efficiency ratings, such as the ErP (Energy related Products) rating, are crucial for understanding a boiler's energy performance. The ecoTec range is highly reputable for its high efficiency, and the ErP rating allows consumers to compare products based on their environmental impact. A higher rating indicates a boiler will use less fuel to produce the same amount of heat, meaning less energy is squandered.

Impact on Energy Bills

Effective utilisation of fuel directly affects energy bills, as it determines the amount of energy required to heat a home. The ecoTec Pro series' high energy efficiency does not only cut down one's ecological impact but also translates into tangible savings on monthly expenditures. Reduced energy consumption leads to lower bills, ensuring the homeowner can enjoy a warm, comfortable home without overspending.

Cost Analysis and Value for Money

The Vaillant ecoTEC Pro combi boiler presents a blend of efficiency and reliability, making its value for money a focal point for potential buyers. This section dissects the cost in relation to competitors, long-term savings, and the overall pricing landscape.

Comparison with Competitors

When positioning the Vaillant ecoTEC Pro against its rivals, such as the Worcester Bosch Greenstar 25Si Compact and the Baxi series, it stands out for its efficiency ratings and robust build quality. The ecoTEC Pro can cost around £2,100 including VAT, which is competitive considering Worcester's equivalent models often occupy a similar price bracket.

Ideal boilers, another competitor, may offer lower initial prices, but the Vaillant brand is synonymous with durability, which can translate to fewer repairs over time. Vaillant boilers typically come with warranties of up to 10 years, giving them an edge over brands like Baxi, which have shorter standard warranty periods.

Long-Term Savings

The ecoTEC Pro's energy efficiency is a critical aspect of its long-term value. It boasts an 'A' rated energy efficiency, which can significantly reduce gas bills. Given the longevity of the unit, coupled with its lower operating costs, users can often recoup the initial investment over several years. The prospective savings are enhanced with features like the modulating pump that further decreases electrical usage.

Moreover, Vaillant offers a range of smart thermostatic controls that optimise heating and can add to the overall savings, making the ecoTEC Pro a smart choice for the cost-conscious buyer.

Pricing and Affordability

Prices for the Vaillant ecoTEC Pro series vary. The Vaillant ecoTEC Pro 28, for example, has a price point starting from £1,250 for the unit alone, with installation costs potentially adding a minimum of £750. These prices are before any promotions or deals offered by installers.

Consumers should be aware that the Worcester 4000 series, while in a reasonably similar price range, may offer distinct features that could sway decision-making based on individual needs. Affordability, therefore, is not just about the sticker price but also the long-term return on investment, efficiency savings, and warranty coverage that Vaillant provides.

Real-Life Usage

In examining the Vaillant ecoTec Pro series, it's apparent that homeowners favour it for its robust performance in residential heating and hot water supply. Let's explore where these boilers excel and where they present challenges for users.

Pros and Cons


  • Energy Efficiency: The Vaillant ecoTec Pro 30 has an ErP rating of A, reflecting high energy efficiency with levels reported around 89.3%, thus potential for lower gas bills.

  • Suitability for Homes: This series is well-suited for small to mid-sized properties. The ecoTec Pro 24 is recommended for homes with up to 3 bedrooms and 1 bathroom, while the Pro 30 caters to slightly larger spaces.

  • Customer Satisfaction: Vaillant boasts a strong customer satisfaction score, with a high likelihood of customer recommendations, underlined by Which? reports.


  • Cost: The initial purchase price of an ecoTec Pro boiler, especially models like the ecoTec Pro 28, is comparatively high, hovering between £980-1,050, excluding installation.

  • Size Limitation: While compact, in homes with multiple bathrooms, the ecoTec Pro 24 might not be sufficient due to potential pressure drops when demand is high.

Common Issues and Resolutions

Common Issues:

  • Pressure Drops: Users have reported occasional pressure drops, notably with the ecoTec Pro 24 when multiple water outlets are in use simultaneously.

  • Fault Rate: There is recognition within the industry for a real fault rate, as discussed amongst engineers and customer feedback.


  • System Upgrade or Additional Installation: For properties with higher demands, upgrading to a system or regular boiler may prevent pressure issues. Alternatively, installing a secondary boiler can support the existing system.

  • Regular Maintenance: Ensuring scheduled servicing can minimize the potential for faults and maintain boiler reliability.

  • Warranty Usage: In case of faults, Vaillant provides warranties, and utilising this support can resolve issues without extra cost to the customer.

To mitigate these issues, the choice of a Vaillant ecoTec Pro boiler should be attuned to household size and water usage patterns, complemented by diligent maintenance and prompt warranty service when needed.

iHeat New Boiler Costs

Boilers can be a daunting purchase for many people as they’re an appliance with a lot of responsibility, providing heat for you and your family is something you want to get right. Boilers aren’t exactly a quickly disposable item either, potentially lasting you a decade.

Effectively, new boiler cost can be split into two segments: the first is the actual boiler itself (unit price), and the second is the cost of the boiler being installed (set up) in your property by an expert engineer. 

Here at iHeat, we want to remove all of this undue stress and make the decision making process of upgrading to a new central heating system, as easy as possible.

Boiler costs can vary depending on a number of factors including their brand, model, fuel, output, warranty, labour and installation type. Typically a new boiler will cost between £1,845 and £3,500, below is a list of average boiler installations offered by iHeat (guide only).

Installation Type

Price (inc VAT)

Combi to combi swap


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System to combi conversion


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New boiler install


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Back boiler to a combi


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System to system


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Frequently Asked Questions

Is Vaillant ecoTEC Pro good?

The Vaillant ecoTEC Pro is considered a reliable and efficient boiler. Its high satisfaction scores among users and commendations from expert engineers suggest it is a good investment for household heating and hot water needs.

What is the difference between Vaillant ecoTEC Plus and Pro?

The key differences between the ecoTEC Plus and Pro lie in their features and efficiency. The ecoTEC Plus models generally offer more advanced features and higher efficiencies, suitable for larger homes, while the ecoTEC Pro is designed with simplicity and cost-effectiveness in mind, ideal for smaller properties.

How old is Vaillant ecoTEC Pro?

The age of a Vaillant ecoTEC Pro can vary. As a model range, it has been on the market for several years. Users should check the manufacture date on their specific unit to determine its age.

How many radiators can a Vaillant ecoTEC Pro 28 run?

A Vaillant ecoTEC Pro 28 is suitable for up to 12 radiators, making it apt for medium-sized properties with a standard number of radiators.

Is Vaillant ecoTEC Pro 28 a good boiler?

The Vaillant ecoTEC Pro 28 is a compact and efficient combi boiler. It is designed to fit in standard kitchen cupboards and is recommended by plumbers and users alike for its performance and reliability.

What is the new Vaillant ecoTEC Pro?

The Vaillant ecoTEC Pro series has evolved over time, with regular updates to improve its efficiency and functionality. The latest models should be checked directly with Vaillant for the most up-to-date specifications and features.

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Article by
Stephen Day | Co-founder
Gas Safe registered and FGAS certified engineer with over 20 years experience in the heating and cooling industry.