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Vaillant ecoFIT Pure System

The Vaillant ecoFIT Pure System offers flexibility, low emissions and high energy efficiency for homes of all sizes.

This powerful boiler by Vaillant has been awarded Which? Best Buy status and the Quiet Mark accreditation. The boiler’s compact size allows for kitchen cupboard installation and its high-quality build hasn’t gone unnoticed by engineers and customers. If you’re looking for a reliable gas boiler that is smart compatible and has a high-efficiency rating, you should definitely take a closer look at the ecoFIT Pure System.

How Much Does this Boiler Cost?

The Vaillant ecoFIT Pure System series is made up of five models, including heat outputs of 12kW, 15kW, 18kW, 25kW and 30kW. Prices vary according to these outputs and typically range between £840 and £1,160 including VAT. Don’t forget, you’ll need to factor in the cost of installation, so it might be best to get quotes that include the price of the boiler and the fitting work. As prices also differ between suppliers and installers, we also suggest you shop around and compare quotes to increase your chances of finding some great deals.

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

Vaillant’s ecoFIT Pure System is a system boiler and, like all boilers of this type, will need a separate cylinder for storing your hot water. Most people with a system boiler keep the cylinder hidden away in their airing cupboard. System boilers are often found in homes with multiple bathrooms because they can provide a constant supply of hot water to taps, even when they are all running at the same time. Another plus point is that they don’t require any tanks in the loft.

As this system boiler comes in a range of outputs, it’s best to ask a Gas Safe registered engineer to assess your heating and hot water demands to help you determine the right size. Whilst visiting for your property, an engineer will be able to confirm if a system boiler is the best type of boiler for your home and lifestyle.

Is it a High Efficiency Boiler?

It’s an incredibly efficient A-rated system boiler with an ErP rating of 94%. To be honest, they don’t come much better than this, which is why this boiler is Energy Saving Trust endorsed. The Vaillant ecoFIT Pure System is also rather smart because it can reduce its maximum output to as low as 20% whenever it detects that your home needs less heat. So, not only will this boiler use less energy but it should save you a heap of cash on your fuel bills.

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

Yep. One of the nice things about this boiler is the bright LED display that is clearly visible when installed in a dimly lit area of your home. User controls include the usual suspects, such as a reset button, pressure gauge and heating and hot water temperature switches. If you want to improve performance and efficiency, you can buy some excellent optional controls and accessories including uniSTOR hot water cylinders and the vSMART app-based control that lets you manage your heating when you’re at home or away. Other key features include top and rear flue options for flexible siting possibilities and an impressive aluminium heat exchanger.

How long is the Warranty on this Boiler?

The ecoFIT Pure System has a 2-year parts and labour warranty as standard, but you may be able to extend this when you hire a Vaillant Advance installer to fit the boiler.

ecoFIT Pure System Sizes and Prices

ModelTypeDimensionsMaximum Flow RateOutputEfficiency RatingTypical Price
ecofit pure system 12SystemH – 700 mm
W – 390 mm
D – 295 mm
N/A12 kWA 90% and above£840
ecofit pure system 15SystemH – 700 mm
W – 390 mm
D – 295 mm
N/A15 kWA 90% and above£950
ecofit pure system 18SystemH – 700 mm
W – 390 mm
D – 295 mm
N/A18 kWA 90% and above£1000
ecofit pure system 25SystemH – 700 mm
W – 390 mm
D – 295 mm
N/A25 kWA 90% and above£1050
ecofit pure system 30SystemH – 700 mm
W – 390 mm
D – 295 mm
N/A30 kWA 90% and above£1160

Summary of Important Information

  • Priced between £840 and £1,160
  • Heating output of 12kW, 15kW, 18kW, 25kW or 30kW
  • Dimensions of 700mm (H) x 390mm (W) x 295mm (D)
  • Uses gas as its fuel source
  • A-rated for efficiency
  • Solar compatible
  • Smart compatible
  • 2-year warranty as standard

Pros and Cons

There is so much to like about the Vaillant ecoFIT Pure System that combines German engineering with UK manufacturing. For a full list of the pros and cons, see below.


  • Awarded Which? Best Buy with a score of 80%
  • Fits in a kitchen cupboard
  • Suited to small, medium and large-sized homes
  • 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 solar thermal – additional savings
  • Compatible with vSMART app based heating control – monitor and control your heating and hot water anytime and anywhere


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