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Vaillant ecoTEC Exclusive with Green iQ System

The Vaillant ecoTEC Exclusive System boilers has a heat output of 27kW and promises to be the ultimate energy efficiency boiler.

Vaillant believes that the ecoTEC Exclusive with Green iQ System offers the best boiler control, efficiency and performance. It’s Quiet mark approved, A-rated for both heating and hot water efficiency and can even work with LPG if you aren’t connected to the mains gas grid. As the boiler is also smart compatible and has a decent warranty, it certainly seems like an appealing option for most modern homes.

How Much Does this Boiler Cost?

If you’re interested in the ecoTEC Exclusive Green iQ System, you’ll need to set aside around £1,300 (price includes VAT). Prices do vary from one supplier to the next, so it’s worth shopping around to see if you can get the boiler for less. As many suppliers and installers are happy to beat like-for-like quotes, don’t be afraid to ask about this when comparing boiler and installation prices.

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

As this is a system boiler, you’ll need a separate cylinder for storing your hot water which is usually installed in an airing cupboard. On the plus side, you won’t need any tanks in your roof space. System boilers are generally recommended for homes with high hot water demands and more than one bathroom because they cope well when multiple taps or two showers running at the same time. This particular boiler has an output of 27kW, making it ideal for medium and large properties.

To know for sure whether the ecoTEC Exclusive with Green iQ System is a good option for your home, we suggest you ask a Gas Safe registered engineer. Your chosen engineer will be able to assess your property and needs to ensure you select the correct boiler type and output.

Is it a High Efficiency Boiler?

Yes. This boiler is ErP A-rated with a SEDBUK seasonal efficiency of 89.6%. It has Vaillant’s Green iQ mark which is the brand’s smartest and greenest technology that reduces consumption, emissions and energy costs. The boiler can also automatically adapt its heat output when it thinks you need less heat, which means you’ll waste less energy and save more money on those fuel bills.

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

It does. The Vaillant ecoTEC Exclusive System has an extra-condense heat exchanger to maximise efficiency and ensure you save as much money as possible. It has a wide modulation ratio of up to 1:10 and 85% of the boiler’s components are recyclable. And as we’ve already mentioned, the boiler is Quiet Mark approved, meaning you shouldn’t hear a peep out of it when running. User controls are concealed and include a reset button, pressure gauge and heating temperature control. Furthermore, this boiler is compatible with uniSTOR cylinders, as well as the vSMART app-based control that enables you to use your smartphone or tablet to manage your heating and hot water and keep an eye on how much energy you’re using each day.

How long is the Warranty on this Boiler?

This boiler comes with a 5-year parts and labour warranty as standard. Vaillant sometimes enables customers to upgrade to a 7 or 10 year warranty, so it’s worth looking into this if you go on to purchase the ecoTEC Exclusive Green iQ System.

Summary of Important Information

ModelTypeDimensionsMaximum Flow RateOutputEfficiency RatingTypical Price
ecoTEC Exclusive Green iQ System 27SystemH – 720 mm
W – 440 mm
D – 338 mm
N/A27 kWA 90% and above£1300
  • Expect to pay around £1,300
  • Heating output of 27kW
  • Dimensions of 720mm (H) x 440mm (W) x 338mm (D)
  • Uses gas as its fuel source
  • A-rated for efficiency
  • Solar compatible
  • Smart compatible
  • 5-year warranty as standard

Pros and Cons

Apart from the fact that the boiler requires a separate hot water cylinder, there’s nothing not to like. Below, you can check out all the pros and cons of the Vaillant ecoTEC Exclusive with Green iQ System.


  • Awarded Which? Best Buy with a score of 80%
  • Suited to homes with more than one bathroom
  • High-quality components
  • Easy to install and maintain
  • Wide modulation ratio – adapts to your needs
  • Extra-condense heat exchanger – extremely high efficiency levels
  • Green iQ Mark – the lowest fuel consumption and running costs
  • 85% recyclable
  • 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
  • Works with LPG if required – perfect for properties off the gas grid
  • 5-year warranty


  • Requires separate cylinder
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