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Last updated: 4th April, 2024


Viessmann Combi Boiler Costs

Viessmann Combi Boiler Costs

Key takeaways

  • Viessmann combi boilers are available for various budgets, with prices ranging widely based on models and features.
  • Efficiency and the potential for long-term energy savings are notable advantages of investing in a Viessmann combi boiler.
  • Proper installation and maintenance are essential for optimal performance and cost-effectiveness of Viessmann combi boilers.

Viessmann combi boilers are renowned for their efficiency and technological advancement.

In navigating the landscape of home heating, Viessmann combi boilers have emerged as a prominent solution for many households in 2024. A combi boiler, short for combination boiler, offers both hot water and central heating within a single compact system. Viessmann’s range, known for its efficiency and advanced engineering, encompasses a variety of models suited to different home sizes and consumer needs.

The cost of these combi boilers varies depending on a multitude of factors, including the specific model chosen, its features, and the potential for energy savings they offer over time.

The pricing for Viessmann Combi boilers begins at a competitive level, with options available from as low as £790, extending up to around £3,287 for more sophisticated units. These upfront costs reflect the boiler alone and do not take into account the additional expenses for Gas Safe installation which are necessary for a safe and compliant setup.

Dependable and energy-efficient, Viessmann boilers are engineered to convert fuel to heat with minimal waste, which can potentially lead to reduced heating bills and a lower environmental impact. The decision to invest in a new boiler system consequently involves not only an assessment of initial costs but also consideration for long-term savings and comfort.

Installation and maintenance are critical elements that influence the total cost of ownership of a Viessmann combi boiler. Proper installation by a certified heating engineer ensures the boiler operates at peak efficiency, which is crucial for both safety and cost-effective performance.

Regular maintenance also plays a role in extending the lifespan of the boiler, preventing unexpected repairs and ensuring the unit remains a reliable source of heat and hot water for the home.

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Understanding Viessmann Combi Boilers

Viessmann combi boilers are renowned for their efficiency and technological advancement. These boilers are designed to be a high-quality solution for modern home heating needs.

What Is a Combi Boiler?

A combi boiler, or combination boiler, is a type of gas boiler that provides both heating and hot water directly from the mains, on demand, without the need for a separate water tank or cylinder. Viessmann combi boilers are energy efficient and help reduce the energy spend which is significant, as around 55% of a home's yearly energy expenditure is attributed to heating.

The Viessmann Brand

Viessmann is an established player in the boiler market, recognised for their robust and reliable gas boilers. Their presence in the UK, while smaller compared to other brands, is characterised by a strong customer satisfaction rate. Viessmann's product range caters to various demands with models that are apt for diverse home sizes and heating requirements.

Viessmann Boiler Technology




Viessmann boilers boast high efficiency ratings, often between 90-94%, significantly reducing energy usage and costs.


Choices range from budget-friendly options to premium models, like the Viessmann Vitodens 050-W and the top-tier Vitodens 200-W.

User Comfort

Radiators are recommended to be set to around 20°C for optimal comfort, balancing efficiency and warmth.

Viessmann combi boilers use advanced technology to ensure efficient heating and hot water supply. They are designed with a focus on user comfort and are equipped with intuitive controls that allow homeowners to manage their heating with precision. The brand's investment in research and development results in boilers that both perform well and stand the test of time.

Cost Factors for Viessmann Combi Boilers

When considering a Viessmann combi boiler, homeowners must account for the price of the boiler itself, the installation expenses, and any additional costs that may arise during the process.

Boiler Pricing

Viessmann combi boilers are varied in pricing, starting around £790 and extending up to £3,287. The cost often correlates with the unit’s specs, such as heating output and flow rate, with higher capacity models commanding higher prices. For instance, the entry-level Viessmann Vitodens 050-W with a 25 kW output may be available for a cost closer to the starting range.

  • Vitodens 050-W 25kW: £750 - £860

  • Vitodens 100-W 26kW: £860 - £1,575

Installation Costs

The installation cost for a combi boiler by Viessmann is influenced by various factors, including the complexity of the job and the rates of the engineer or installer. A straightforward swap with existing compatible infrastructure will come in at the lower end, while pricing increases with the complexity and time required for the job. However, on average, customers might expect to add an additional £500 to £1,500 to the price of the boiler for installation.

Additional Costs

Additional costs may be incurred for upgrading pipework, removing old systems, or integrating smart controls for enhanced comfort and energy efficiency. Customers also need to be aware of potential post-installation servicing and ongoing maintenance expenses. Some additional elements can include:

  • Magnetic system filters

  • Thermostatic radiator valves

  • Power flush of radiators

Considering these factors and their variable nature, prospective buyers are encouraged to seek quotes from professionals to get accurate pricing tailored to their specific circumstances and boiler choice.

Viessmann Combi Boiler Models

Viessmann offers a range of combi boilers renowned for their reliability and performance. The selection provides exceptional value for money and caters to various household needs with distinct features across models.

Vitodens 050-W

The Vitodens 050-W is a compact combi boiler, ideal for small to medium-sized homes. It is known for its space-saving design and straightforward functionality, underscored by a robust build that stands the test of time.


Vitodens 050-W


High, with a lower flow rate


Suited for tight spaces

Fuel Utilisation

Uses natural gas or LPG efficiently

Vitodens 100-W

Vitodens 100-W emerges as Viessmann's bestseller, boasting a quiet operation and user-friendly interface, thus ensuring it satisfies a considerable segment of homeowners looking for a blend of efficiency and convenience.

  • Efficiency: Up to 98% conversion rate of gas into heat

  • Design: Sleek and size-conscious; fits unobtrusively within a home

  • Fuel Options: Adaptable to natural gas, LPG

Vitodens 200-W

The Vitodens 200-W is designed for those who prioritise advanced control and higher performance in their home heating systems. It typically serves larger properties with its superior efficiency and smart connectivity.

  • Control: Smart thermostats for enhanced usability

  • Performance: Top-tier in Viessmann's combi boiler range

  • Build Quality: Durable and designed for longevity

Vitodens 111-W

Tailored for homes with higher hot water demand, the Vitodens 111-W combines the efficiency of its siblings with a built-in storage tank to ensure a steady supply of hot water, even in peak times.

  • Capacity: High hot water capability thanks to an integrated storage tank

  • Dimensions: Larger size to accommodate the extra hot water storage feature

  • Utility: Excellent for families or homes with significant hot water usage

Efficiency and Energy Savings

Selecting a Viessmann combi boiler in 2024 may significantly lower energy bills due to its superior energy efficiency. These models are engineered to offer maximum thermal output while minimising fuel input, leading to both financial savings and environmental benefits.

Energy Efficiency Rating

Viessmann Vitodens combi boilers boast an energy efficiency rating of 92%-98%. This impressive range indicates that a scant 2-8% of energy is lost during operations, which is a noteworthy benchmark for such boilers. A higher grading equates to more effective fuel utilisation and, consequently, lower energy expenditure. As corroborated by the Energy Saving Trust, investing in a boiler with a high-efficiency rating can lead to substantial energy savings.

  • Viessmann Vitodens 100-W Combi: 98% Efficiency

  • Energy Consumption: Reduced

Reducing Carbon Emissions

In addition to financial savings on energy bills, opting for a Viessmann boiler aligns with eco-friendly practices by reducing carbon emissions. The efficiency of these boilers not only curbs household energy usage but also mitigates the impact on the environment. The less energy consumed, the fewer carbon emissions are produced. Selecting an energy-efficient combi boiler from Viessmann can thus be a conscious step towards a cleaner, more sustainable future.

  • Carbon Footprint: Significantly Lowered

  • Environmental Impact: Improved

Benefits of Viessmann Combi Boilers

Viessmann combi boilers stand out in the market with their blend of efficiency, space-saving design, and dependable performance.

Compact Design

The Viessmann combi boiler is an embodiment of space efficiency. Its compact structure makes it a suitable choice for homes with limited space, negating the need for separate hot water cylinders and thus freeing up valuable room.

Heating and Hot Water on Demand

These boilers are well-regarded for their ability to provide hot water and heating on demand, directly from the mains without the necessity for storage. This ensures that hot water is available whenever it's required, with impressive efficiency ratings of up to 94 per cent, meaning less energy is consumed to maintain comfort in your home.

Long-Term Reliability and Warranty

Reliability is a cornerstone of the Viessmann ethos. Their boilers are designed for longevity and come with long warranties, ensuring peace of mind for consumers. Viessmann's customer satisfaction remains robust, and the investment in one of their combi boilers is underpinned by solid after-sales support and warranty provisions.

Installation and Maintenance

When selecting a new Viessmann combi boiler, it is essential to consider both the upfront installation costs and the ongoing maintenance. These factors ensure the longevity and efficiency of the boiler.

Choosing an Installer

Selecting a certified engineer for the installation of a Viessmann combi boiler is paramount. Engineers must be Gas Safe registered in the UK, a testament to their skill in safely and effectively fitting gas boilers. Consumers may expect to encounter installation costs ranging from, but not limited to, £1,200 to £2,000, which can vary depending on the complexity of the job and geographical location. It's advisable to obtain multiple quotes to secure a competitive price.

Installation Guide

The process of installing a new Viessmann combi boiler typically involves several steps. Initially, the engineer will conduct an assessment to determine the appropriate boiler size and location. Installation includes the removal of the old boiler, fitting the new unit, connecting it to your existing pipework, and ensuring that all components, such as filters are properly installed. This is usually completed within a day, barring any unforeseen complications. Costs can fluctuate, influenced by factors such as the necessity for additional pipework or the complexity of the relocation.

Maintenance and Servicing

Regular maintenance is crucial for a Viessmann combi boiler's performance and longevity. Manufacturers often stipulate that yearly servicing is a condition of the warranty; thus, neglecting this can void the warranty agreement. Servicing should be undertaken by a Gas Safe registered engineer and includes checks and cleans of the boiler to prevent issues from arising prematurely. A standard service can cost around £60 to £100. However, these prices can vary, so it's wise to plan for these annual expenses.

Viessmann Combi Boiler Features

Viessmann combi boilers are engineered for efficiency and convenience, incorporating cutting-edge technology with user-centric design. They offer both robust heating solutions and instantaneous hot water supply within a compact form factor.

Heat Exchanger Technology

Viessmann combi boilers utilise a stainless steel Inox-Radial heat exchanger. This makes them not only highly efficient but also durable.

Smart Control Options

The integration of Wi-Fi connectivity in many Viessmann combi boilers allows for smart control options. Homeowners can manage their heating and hot water settings remotely via a smartphone app. These smart systems facilitate the monitoring and adjusting of energy usage, leading to potential cost savings and enhanced control over home comfort levels.

Customer Opinions and Reviews

Viessmann boilers have carved out a respectable place in the UK market, with homeowners expressing a notable level of contentment. Evaluations span from expert insights to owner anecdotes, each painting a varied picture of the customer experience.

Homeowner Experiences

Homeowners who have invested in Viessmann gas boilers mostly report a positive experience. A significant majority, 83%, express satisfaction with their boiler's performance. They often describe their Viessmann boilers as neat, compact, and quiet. Furthermore, instances of positive feedback have surfaced on platforms like Trustpilot, with some customers voicing their readiness to recommend Viessmann to others after their experiences on 15 January 2024.

Which? Best Buy Recognition

The Which? Best Buy endorsement offers a deep dive into the reliability and efficiency of gas boilers, and it’s a prestigious accolade in the industry. Viessmann has caught the attention of Which?, with its gas boilers needing a score threshold of 78% to earn the Best Buy status. The achievement of this threshold by Viessmann signifies a notable endorsement from engineers and reflects a strong concoction of reliability, homeowner satisfaction, and professional recommendations.

Comparing Viessmann to Other Brands

When evaluating the cost of Viessmann combi boilers, it's essential to examine how they stack up against alternative manufacturers. This section details comparisons with other combi boiler brands and assesses Viessmann's market positioning.

Other Combi Boiler Brands

Viessmann's most direct competitors in the combi boiler market include brands like Worcester Bosch and Vaillant. Specific comparisons note that the Viessmann Vitodens 200-W combi boiler's dimensions are typically more compact, at 700mm in height, 450mm in width, and 360mm in depth. Contrastingly, Worcester Bosch's Greenstar 8000 Life combi boiler is slightly larger with dimensions of 365mm in depth, 440mm wide, and 780mm high.

In terms of performance and efficiency, Viessmann boilers, such as the Vitodens 050, provide an efficiency rating of 92% according to the Sedbuk rating, higher than the 89.3% achieved by competitive Vaillant models. Maintenance and reliability are factors that favour Viessmann, with the brand receiving high accolades for both its reliability and customer satisfaction, a sentiment echoed by industry engineers and end-users alike.

Market Comparison and Positioning

In the competitive landscape of 2024, Viessmann sets itself apart by offering high-efficiency levels across its boiler models. Its 200-W series is reported to have an impressive 98% efficiency. The brand's commitment to using quality components is evident and rivals that of brands like Ideal, which has also enhanced the quality of components in its models, such as the Vogue Max.

Efficiency Comparison Table









Data not stated

Worcester Bosch

Greenstar 8000 Life

Data not stated


EcoTEC Pro


Viessmann's boilers are commonly recommended by their existing customer base, signifying the brand's solid reputation in the market. The quality, coupled with the efficiency of their combi boilers, often positions Viessmann as a top contender in the eyes of consumers seeking the best combi boiler for their home heating needs.


For those considering a Viessmann combi boiler, it's useful to explore the range of alternative heating solutions. These alternatives cater to varying household sizes, preferences, and fuel types and include system and regular boilers, electric and oil combi boilers, and storage combi boilers.

System and Regular Boilers

System boilers work with a separate cylinder for storing hot water, making them a reliable choice for homes with higher hot water demand. Unlike combi boilers, they can provide hot water to multiple taps simultaneously without a drop in pressure. Regular boilers, also known as traditional or conventional boilers, require both a cold water tank and a hot water cylinder. This type makes sense for properties where a loft space can accommodate the tank, and there is a necessity for a steady flow of hot water from several outlets at once.

Electric and Oil Combi Boilers

Homes that lack access to mains gas may consider electric combi boilers. These are compact and don't emit carbon monoxide, providing a cleaner alternative to gas boilers. Oil combi boilers, another choice for those off the gas grid, are typically larger units due to the integral oil tank but are efficient and can be a cost-effective solution for central heating and hot water, especially in rural areas.

Storage Combi Boilers

Storage combi boilers bridge the gap between the instantaneous water heating of combi boilers and the high volume capacity of system boilers. They come with an integrated hot water storage tank, making them capable of supplying hot water in larger quantities instantly, which is beneficial for homes with multiple bathrooms and simultaneous demand for hot water.

After-Purchase Support and Resources

Upon acquiring a Viessmann Combi Boiler in 2024, customers can rest assured that the company provides substantial after-purchase support. Viessmann UK ensures that support resources are readily accessible, offering comprehensive customer service options, detailed feature guidance, and robust warranty coverage.

Customer Support

Viessmann UK prides itself on its customer support infrastructure. Owners of Viessmann boilers can contact specialist advisors in Telford for any enquiries. The dedicated team can be reached via phone at 01952 675000 or via email, ensuring that expert support is just a call or click away. For more hands-on assistance, customers have the option to book a visit from a Viessmann Service Engineer, who will provide service at the customer's location.

Key Features

Viessmann Combi boilers are renowned for their efficiency and convenience. These units heat water on demand, removing the need for a hot water cylinder. Direct mains water feed eliminates any necessity for a cold water tank, streamlining the system. Customers benefit from a modern heating solution that is compact, space-saving, and designed to fit seamlessly into their domestic environment.

Warranty and Guarantees

The manufacturer's warranty enhances the appeal of a Viessmann Combi Boiler. Customers will find a range of boiler warranties, typically starting from 5-year warranties. These policies are a testament to the confidence Viessmann has in its products, offering customers peace of mind. Warranty terms and coverage details are carefully explained, ensuring that customers understand the protection provided for their investment.

Prior to investing in a Viessmann combi boiler, understanding the legal and safety framework is essential. It is not just about compliance; these measures ensure that the installation and operation are both safe and legally sound.

Regulations and Standards

Installing a combi boiler in the UK must adhere to stringent Building Regulations. Specifically, Part L focuses on the conservation of fuel and power. It mandates that new boilers must be at least 92% efficient according to the Energy-related Products (ErP) Directive. In regard to safety, the Gas Safety (Installation and Use) Regulations 1998 govern the installation, maintenance, and use of gas systems, requiring any work to be carried out by a Gas Safe registered engineer.

  • ErP Directive: 92% efficiency required

  • Gas Safety Regulations: Mandatory Gas Safe registration

Certifications and Compliance

When selecting a Viessmann combi boiler, confirm it has the CE marking, denoting its conformity with European health, safety, and environmental protection standards. Reputable boilers come with an energy label, rating their efficiency from G (least efficient) to A+++ (most efficient). Furthermore, regular maintenance conducted by accredited professionals is not just advisable, but often a condition of warranty and a key compliance factor. This ensures both optimal performance and safety.

  • CE Marking: Confirms European standard conformity

  • Energy Label: Efficiency rating from G to A+++

  • Maintenance: Essential for performance and warranty compliance

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.

Boiler costs 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

How much does it cost to install a Viessmann boiler?

The cost to install a Viessmann boiler can vary greatly depending on the model and installation complexities. On average, installation costs range from £1,200 to £2,000, including labour, building regulations documentation, and any additional parts needed.

How much is a Viessmann boiler UK?

In the UK, a Viessmann boiler's price can start from approximately £750 and go up to £3,500 or more. The final price depends on the specific features and efficiency of the boiler model chosen.

Is Viessmann better than Worcester?

Both Viessmann and Worcester boilers are reputable brands. Viessmann is renowned for its high efficiency, with some models like the Viessmann Vitodens 200-W being 98% efficient. The choice between the two often depends on individual requirements and preferences for heating systems.

How much does it cost to fit a combi boiler?

Fitting a combi boiler can cost from £1,200 to £2,000, a range that typically includes labour and necessary additional expenses like parts and documentation.

How long do Viessmann boilers last?

Viessmann boilers are known for their durability and can last up to 15 years or more with proper maintenance and servicing, reflecting the brand's commitment to manufacturing long-lasting heating systems.

Are Viessmann boilers efficient?

Viessmann boilers are designed for high efficiency, with models achieving over 90% efficiency. Some premium models, such as the Viessmann Vitodens 200-W, boast an impressive 98% efficiency.

Who makes Viessmann boilers?

Viessmann boilers are manufactured by the Viessmann Group, a German company with a strong reputation for producing innovative and efficient heating and cooling systems.

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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.