Extreme hot water efficiency


The Intergas Xtreme is our latest central heating boiler. A fusion of performance, intuition and design, not to mention extreme hot water efficiency, the Xtreme reduces energy consumption without sacrificing comfort.

The only boiler awarded 'Best in Test'
xtreme 36
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For today’s discerning user

We designed the Intergas Xtreme central heating boiler with today’s discerning user in mind. You demand greater energy efficiency and higher performance in terms of home heating and hot water than ever before. The Intergas Xtreme meets these demands in every respect, delivering the comfort and peace of mind you expect.


The Xtreme incorporates the tried-and-tested back-to-back two-in-one aluminium heat exchanger. Our patented design, with its fully integrated copper circuits, ensures optimum heat transfer while minimising heat loss. The central heating water and cold tap water flow directly through the heat exchanger so the flue gases cool to the maximum and condensation heat is used optimally.

The Xtreme also has a built-in flue gas recovery unit at the back of the heat exchanger, which is connected to the flue. It extracts the excess energy from the condensate water and this energy is used to preheat the water for domestic hot water or heating, depending on which mode is being used. This reduces still further the amount of gas needed to reach the required temperature, while lowering both CO2 emissions and energy bills.