Vitocrossal 300 CM3 - for flexible use in the medium output range

Take advantage of these benefits

  • Converts up to 98 percent of the energy used into heat
  • Quiet, economical and environmentally responsible
  • Smooth stainless steel heat exchanger surfaces create self-cleaning effect
  • Lambda Pro Control combustion controller for all gas types
  • A strong draught in the flue outlet makes it possible to use long pipe runs for ventilation air and flue gas

Reliable condensing technology

The Vitocrossal 300 is a gas condensing boiler with Inox-Crossal heat exchanger and MatriX radiant burner.

It can be used flexibly for many applications in the medium output range from 87 to 142 kW, such is heating in apartment blocks, as well as in public and commercial buildings.

Its vertically arranged heat exchanger surfaces exploit the condensation energy in its hot gases particularly well, with up to 98 percent of the energy used being converted into heat.

The Vitocrossal 300 is available with a factory-fitted MatriX radiant burner or prepared for fitting ELCO or Weishaupt pressure-jet gas burners.

Convenient Vitotronic control unit

System users and contractors benefit equally from the easy-to-use Vitotronic control unit: as the structure of its menu is logical and clearly laid out and the unit is backlit, rich in contrast and easy to read.

If in doubt, a help function informs users of the next steps to perform. The graphic user interface also displays heating curves and solar yield if a solar thermal system is connected.

Product cross-section


Output (kW)
87 to 142 kW
Standard seasonal efficiency [to DIN]
98 % (Hs) [gross cv] / 109 % (Hi) [net cv]
Energy efficiency class
Natural Gas & LPG
Application range
icon-wohngebaeude.png icon-gewerbe.png icon-kommunen.png
Apartment buildings, commerce, municipal offices, new build and modernisation projects
Easy-to-use Vitotronic control unit with plain text and graphic display
DHW heating
Additional DHW cylinder(s) required, resulting in a high level of DHW convenience
Additional features
Modulating MatriX gas burner with wide modulation range
Produktschnitt Gas-Brennwertkessel Vitocrossal 300 Typ CM3


A perfect match – System technology

"The whole is greater than the sum of its parts". Following this philosophy, Viessmann supplies more than high quality, reliable and effective heating components. In fact, all products are part of a matching total concept, where all components complement one another. After all, only perfect interaction between all system components can draw out the maximum potential of our innovative leading technology.

Viessmann system technology incorporates everything you need for a reliable and economical heating system: From the Vitotronic control unit with wireless remote control, powerful Vitocell DHW cylinders for the highest DHW convenience, right up to high grade solar thermal systems for cost effective central heating backup.