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Intergas Xtreme Combi Boiler

Intergas Xtreme Combi

The Intergas Xtreme Combi is available in a range of outputs to meet the demands of many households.

Packed with energy-saving features, the Intergas Xtreme Combi is a user-friendly gas condensing boiler that is best suited to homes with only one bathroom. It comes in three heat outputs and has two heat exchangers to ensure extremely high efficiency is achieved. Designed to ensure less fuel is used to keep your home warm and comfortable, this combination boiler can reduce carbon emissions at home and lower your energy bills too.

How Much Does this Boiler Cost?

The Intergas Xtreme Combi can be purchased with an output of 20kW, 26kW or 32kW and you can expect to pay between £1,275 and £1,400 (including VAT) to own one of these models. You need to put aside some cash to pay for the boiler to be installed as well, which can cost anything from £500 to £1,500. If you decide to buy this boiler, make sure you get a handful of fixed-price quotes from a range of Gas Safe registered installers to enable you to compare prices and find the best deal.

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

A combi boiler can be installed without tanks in the loft or a hot water storage cylinder, making the Intergas Xtreme Combi a great choice if you don’t have a lot of storage space at home. This type of boiler heats water from the mains before delivering it to your taps but it will struggle to cope with multiple baths or showers running at the same time, so it’s only suitable if you don’t have high hot water demand. As this boiler comes in a variety of kW outputs, you need to figure out which size is best for your home and needs.

The easiest way to calculate the right boiler size for your property is to ask a heating engineer. They’ll need to know a few things first, such as how many radiators you have in your home and your heating and hot water requirements, before they can help you determine the correct boiler size/output.

Is it a High Efficiency Boiler?

It sure is. The Intergas Xtreme Combi has a passive built-in flue gas heat recovery unit, designed to raise energy efficiency to another level. This unit reclaims more heat from waste gases than conventional condensing boilers, meaning less energy is required to produce hot water and therefore further cuts down on harmful emissions and reduces your fuel bills. The boiler itself is A-rated for efficiency, with a rating of 93%.

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

The Xtreme Combi from Intergas has a fully integrated touch screen control panel and displays information about the boiler’s operational mode. It has an expansion vessel, a combined PRV and condensate connection, integral filling loops, dual OpenTherm inputs and the passive built-in flue gas hear recovery unit we mentioned earlier. This boiler also has a two-in-one heat exchanger to optimise heat transfer while minimising heat loss to reduce energy consumption, and this heat exchanger comes with a 10-year warranty.

How long is the Warranty on this Boiler?

The Intergas Xtreme Combi comes with a free 7-year parts and labour warranty, which must be registered by you or your installer within 30 days of the boiler being fitted.

Summary of Important Information

  • Expect to pay between £1,275 and £1,400
  • Heating output of 20kW, 26kW or 32kW
  • Hot water flow rates of 12, 19 or 20 litres per minute
  • Xtreme 24 Dimensions of 766mm (H) x 450mm (W) x 277mm (D)
  • Xtreme 30 Dimensions of 766mm (H) x 450mm (W) x 277mm (D)
  • Xtreme 36 Dimensions of 826mm (H) x 450mm (W) x 277mm (D)
  • Uses gas as its fuel source
  • A-rated for efficiency
  • 7-year warranty as standard

Pros and Cons

We believe that the Intergas Xtreme Combi is a great value for money boiler with some fantastic features, impressive energy-saving technology and a generous warranty, and it seems as though we’re not the only ones. The brand has an Excellent score on Trustpilot, however, it also has a below-average Which? score, so you may want to read online reviews before buying this boiler.


  • Suited to small and medium-sized homes with one bathroom
  • Easy to install, use and service
  • Unique two-in-one heat exchanger with a 10-year warranty
  • Built-in passive flue gas heat recovery – lowers emissions and energy bills
  • Extreme hot water efficiency
  • Innovative control system
  • Excellent rating on Trustpilot – correct at time of writing in November 2020
  • 7-year warranty


  • Intergas has an overall Which? score of 52%
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