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Vaillant ecoFIT Pure 25kW, 30kW, 35kW Combi

The Vaillant ecoFIT Pure Combi boiler is one of the quietest and most reliable combination boilers on the market today.

If you’re looking for a high-performance gas condensing combination boiler for your home, you’ll struggle to find better than the ecoFIT Pure Combi by Vaillant. Designed to suit almost any property and lifestyle, this efficient boiler offers low energy consumption and is small enough to fit inside most kitchen cupboards. It’s also unbelievably quiet and compatible with smart heating controls to enable you to control everything from your smartphone.

How Much Does this Boiler Cost?

As the Vaillant ecoFIT Pure Combi is available in three heat outputs of 25kW, 30kW and 35kW, prices vary according to the kW output and typically range between £850 and £1,100. You might be able to find a better deal than this if you shop around and compare prices from different boiler suppliers and installers. Before doing so, make sure you get in touch with a Gas Safe registered engineer to find out whether this boiler will meet your needs and, if so, which output is the best match for your home and requirements.

How will I know if this Boiler is Suitable for My Home?

Like all combination boilers, the Vaillant ecoFIT Pure Combi doesn’t need to be installed with a cold water tank or a hot water cylinder. As combi boilers don’t need separate components and take up less space than other boiler types, they are generally recommended for homes where space is limited. That’s not to say that the Vaillant ecoFIT Pure Combi is only a good choice for flats and small houses, though. Because this boiler comes in three heat outputs, it’s also ideal for medium and large properties with one bathroom.

To determine if a combi is the right type of boiler for your home, you must consult a Gas Safe registered engineer. In addition to telling you the right boiler type, they will be able to help you work out which output is capable of meeting your heating and hot water needs.

Is it a High Efficiency Boiler?

It sure is. The Vaillant ecoFIT Pure Combi is an A-rated boiler with an efficiency of 89%. Thanks to its powerful heat exchanger, the boiler is able to offer low energy consumption. It can also lower its maximum output to just 20% when it realises that you need less heat to keep your home comfortable, helping to save energy and reduce your fuel bills.

Does this Boiler have a Good Range of Controls and Features?

You’ll get a great range of controls with this one, such as a reset button, system pressure gauge and central heating and hot water temperature control switches. Vaillant does offer some optional controls as well, including the vSMART app based heating control that comes with weather compensation to reduce your energy bills and allows you to control your heating and hot water via your smartphone. Other decent features include an LED display and an aluminium heat exchanger that enhances performance and helps to prolong the boiler’s life. On top of all of those wonderful things, the ecoFIT Pure Combi is Quiet Mark approved, making it one of the quietest boilers around.

How long is the Warranty on this Boiler?

The Vaillant ecoFIT Pure Combi comes with a 2-year parts and labour warranty as standard. If you choose a Vaillant Advance installer to fit the boiler, you may be offered a longer warranty between 7 and 10 years.

ecoFIT Pure Combi Size and Price Range

ModelTypeDimensionsMaximum Flow RateOutputEfficiency RatingTypical Price
ecoFIT Pure Combi 25CombiH – 790 mm
W – 390 mm
D – 295 mm
14.1 l/min25 kWA 90% and above£850
ecoFIT Pure Combi 30CombiH – 790 mm
W – 390 mm
D – 295 mm
14.1 l/min30 kWA 90% and above£1000
ecoFIT Pure Combi 35CombiH – 790 mm
W – 390 mm
D – 295 mm
14.1 l/min35 kWA 90% and above£1100

Summary of Important Information

  • Priced between £850 and £1,100
  • Heating output of 25kW, 30kW or 35kW
  • Hot water flow rates of 10.4, 12.2 or 14.1 litres per minute
  • Dimensions of 700mm (H) x 390mm (W) x 295mm (D)
  • Uses gas as its fuel source
  • A-rated for efficiency
  • Smart compatible
  • 2-year warranty as standard

Pros and Cons

According to Which?, the Vaillant ecoFit Pure Combi is one of the best boilers your money can buy. Our only gripe is the length of the warranty. Below, you can find all the pros and cons of this boiler.


  • Awarded Which? Best Buy with a score of 80%
  • Fits in a kitchen cupboard
  • Suited to small, medium and large-sized homes
  • No need for separate cylinder or loft tanks
  • High-quality components
  • Easy to install and maintain
  • Top and rear flue options – flexible siting possibilities
  • Quiet Mark approved
  • Provides maximum energy efficiency – reduce fuel bills and carbon emissions
  • Compatible with vSMART app based heating control – monitor and control your heating and hot water anytime and anywhere


  • 2-year warranty – would prefer a longer standard guarantee
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