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Last updated: 4th April, 2024


How a New Vaillant Boiler can Reduce Energy Bills

How a New Vaillant Boiler can Reduce Energy Bills

Key takeaways

  • All Vaillant ecoTEC boilers are A rated for efficiency and are space saving to boot.
  • A new boiler can save you over £800 a year when replacing an old, broken boiler.
  • Vaillant utilise the 6 'Green Rules' when it comes to performance and being kind to the environment.

Vaillant are manufacturers of boilers that are not only excellent at heating your home, but are also extremely efficient when doing so, a win-win situation for any homeowner!

In this blog we’ll be taking a look at how a new Vaillant boiler can reduce your energy bills due to its amazing performance.

A little about Vaillant Boilers

Vaillant is a renowned international boiler manufacturer, whose origins began in Germany, in 1874! 

Still operating across the world and as one of Europe’s most successful family businesses today, Vaillant continues to pioneer and stratify energy efficiency blended with heating functionality and application throughout their products.

Vaillant boilers’ 140+ year heritage is not only testament to their engineering prowess, but also their ability to adapt and utilise advancements in modern technology.


Environmentally Friendly

Vaillant is one of the world’s leading manufacturers of environmentally friendly heating and cooling technology.

Taking precedence in their ethos and products is sustainability in order to contribute to achieving climate protection targets.

Vaillant boilers claim via the installation of one of their new high efficiency boilers you can save more than 30% energy as well as reducing CO2 emissions by a further 30%.


The front line of Vaillant’s calculated green revolution is their ecoTEC range of boilers, premium, powerful and environmentally conscious.

ecoTEC boilers are more than just a heating appliance, they are an investment in terms of longevity and potential for return.

What Makes a Vaillant ecoTEC Boiler Special?

Vaillant’s range of ecoTEC models consists of combis, system and heat only (regular) boilers, and across this celebrated range you can find models than contain some or all of these features:

  • A rated in terms of energy efficiency (ErP)

  • Extremely compact design to allow for storage in an airing cupboard

  • Compatible with the Vaillant vSMART control app

  • Quiet Mark award recipient for stellar work in sound reduction (operational volume)

  • 85% recyclable

  • Green IQ

Vaillant’s Green IQ hallmark ensures ultimate energy efficiency, providing the lowest fuel consumption rates and subsequently the lowest fuel bills.


How Can A New Boiler Reduce Energy Costs?

Naturally, the newer a central heating system, the more efficient it is due to engineering and design progression. Outdated or failing systems could be the reason for your shock when seeing your monthly energy bills. 

Most UK boilers are running at 80% energy efficiency with some antiquated models operating at 60% or less! These sub optimal levels of output are as avoidable as they are shocking.

Age of Boiler

Efficiency Percentage

Efficiency Rating (ErP)

0+ Years

90% +


10+ Years

85% +


15+ Years

80% +


20+ Years

70% +


25+ Years

60% +


The direct correlation between a boiler’s age and its efficiency is clear to see in the newer systems’ ErP, so it may be worth upgrading your model to an energy efficient boiler.

A high level boiler shouldn't be looked at as an expense, but as mentioned above, an investment that will save you money in the long run. 

New boilers are designed to last longer than older models. This means you won't need to replace your boiler as often, which can save you money in the long run.

If you choose a cheaper ‘budget’ appliance to save on initial costs the chances are you could end up paying more in maintenance and repair fees due to inadequate design and poor performance.

Vaillant boilers come with advanced controls that allow you to set your heating and hot water schedules to suit your needs. This means you can heat your home and hot water only when you need it, rather than wasting energy on heating an empty house or hot water tank.

New boilers are often better insulated than older models, which can help prevent heat loss and improve overall efficiency.

Selecting the Right Vaillant


Combis or combination boilers, combine all components and aspects of a heating system (central heating and hot water production) into one succinct and powerful unit.

Their economic size, quick flow rates and dual functionality means combis are extremely efficient and effective when heating a multitude of property sizes, being best suited for small to medium sized homes with 1-2 bathrooms.


System boilers perform best in homes with a high hot water demand, specifically either larger properties with a higher number of residents or properties with two or more bathrooms. 

System boilers store hot water in a separate cylinder which provides constant flow access but requires additional (minimal) storage space.

System boilers can service multiple flow outlets at one time, meaning no one in a larger home would be standing around waiting for a shower.

Heat Only

A heat only boiler provides the heat for a home's central heating system and hot water cylinder. A heat only boiler is suited to servicing larger properties with multiple bathrooms/radiators or a business premises with a high water demand. 

Heat only boilers do require sufficient installation space within a property, as they use two storage tanks (feed & expansion) as well as the aforementioned hot water cylinder. 

Although a combi is generally considered more space saving, a modern heat only boiler is still compact and can supply more bathrooms with hot running water than a combi can.

Vaillant utilise the 6 Green Rules

Energy Efficient

Vaillant’s onus of sustainability and energy efficiency is reflected in their innovative products and low-emission technologies, designed to protect natural resources. The ecoTEC exemplifies Vaillant’s dedication to these principles. By significantly reducing CO2 emissions, these boilers contribute to a cleaner environment, with zero emissions at the point of use.


Vaillant is dedicated to delivering durable and robust products that are made using high-quality materials. Their commitment to quality is demonstrated through their rigorous standards of diligence and precision. 

Vaillant devices undergo a wide range of state-of-the-art tests that evaluate their performance under various climatic, technical, and physical operating conditions. 

These tests ensure that their products meet the highest quality standards and offer long-lasting service life. With their focus on quality, Vaillant provides reliable and sustainable solutions for their customers' needs.


Vaillant is committed to a responsible sourcing of materials and suppliers, and takes an environmentally friendly approach to production and logistics. For example, Vaillant prioritises materials with a high metal content to increase the lifespan of their products. 

Vaillant works closely with their suppliers to develop a zero-defect strategy that is implemented throughout their entire value chain. Additionally, Vaillant production sites use green electricity, further contributing to their sustainable practices. 

By prioritising sustainability and responsible sourcing, they are able to offer high-quality products that are both durable and environmentally friendly.


Vaillant is committed to providing an excellent quality of service, and guarantees the availability of spare parts for up to 15 years after installation. Their appliances are designed for easy accessibility during repairs, and with their focus on repair-ability, they are able to extend the lifespan of their products, reducing waste and saving valuable resources. 

By offering durable and easily repairable products, the company aims to provide sustainable solutions that benefit both their customers and the environment.


Vaillant prides itself on creating intelligent and user-friendly products that are simple to install and operate. This includes intuitive controls, smart home apps, and transparent energy monitoring features that help users optimise the energy usage of their appliances. By providing these innovative and user-friendly solutions, Vaillant empowers their customers to run their appliances with greater efficiency and ease.

End of Life

Vaillant has a strong commitment to preserving natural resources and promoting eco-friendly disposal of products. 

Vaillant achieves this by designing our products with maximum recyclability in mind, ensuring that as many materials as possible can be repurposed and reused.

Vaillant aims to reduce waste and promote responsible use of resources. Vaillant’s focus on eco-friendly practices extends beyond just the creation of our products, as they strive to ensure that the end of life disposal of their products is handled in an environmentally responsible manner.


iHeat deliberately stocks the best products from trusted brands for competitive prices, and now we are proud to include extremely energy efficient Vaillants to our range, the only online boiler installation company to do so.

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