Xtreme 24

Xtreme 24

Unique 2-in-1 heat exchanger
Built-in flue gas recovery
Extreme hot water efficiency
Innovative control system

Energy label AEnergy label A XL

  • 20 kW power
  • CW3

Xtreme 24

The Xtreme boiler has been designed with today’s discerning consumers in mind. They demand greater energy efficiency and higher performance from their boiler, but also want comfort, warmth and reliability, and that’s exactly what the Xtreme delivers.

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Article number 35004
Signature Output 20
Maximum CH water temperature °C 90
Nominal load lower value tap water kW 3.60 - 25.10
DHW Flow Rate at ΔT 25°C l/min 14.50
DHW Flow Rate at ΔT 35°C l/min 12
DHW temperature (factory setting) °C 55
Height mm 766
Width mm 450
Depth mm 279
Weight kg 39


  • Flyer Intergas Xtreme


  • Operation instructions Xtreme
  • Installation manual Xtreme (57.72 MB)


  • Spare parts manual Xtreme
  • Y plan diagram with external relay option (Xtreme , Xclusive)
  • Y plan diagram (Xtreme, Xclusive)
  • X Plan diagram (Xtreme , Xclusive)
  • X Plan diagram (Xtreme , Xclusive) low voltage option
  • Underfloor diagram (Xtreme, Xclusive)
  • S Plan X Range diagram weather compensated (X-Range)
  • S Plan diagram (Xtreme, Xclusive)
  • Warranty Terms and Conditions
  • Gas boiler commissioning checklist