Vitocrossal 300 CT3B - top quality for commercial enterprises and municipal authorities

Take advantage of these benefits

Converts up to 98 percent of the energy used into heat
- Stainless steel Inox-Crossal heat exchanger ensures high operational reliability and a long service life
- Smooth stainless steel heat exchanger surfaces create self-cleaning effect
- Alternatively available with ELCO or Weishaupt pressure-jet gas burner
- Two return connectors for hydraulic connection optimised for condensing technology

Condensing technology up to 314 kW

The Vitocrossal 300 CT3B is a gas condensing boiler with Inox-Crossal heat exchanger and MatriX radiant burner. The burner delivers an output of up to 314 kW and adjusts its heat generation from 30 to 100 percent as required, to save energy. Further features include particularly quiet, economical and environmentally responsible operation.

Alternatively, the boiler is also available factory fitted with ELCO or Weishaupt pressure-jet gas burners. The design of the heat exchanger in the Vitocrossal 300 enables high output levels, yet retaining modest dimensions and a low weight. To facilitate handling, the condensing boiler can be delivered in two sections.

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.

Beratung - kostenlos & unverbindlich

Partner vor Ort

Eine individuelle Beratung erhalten Sie bei Ihrem Viessmann Fachpartner vor Ort. Bitte geben Sie für die Suche Ihre Postleitzahl, für genauere Treffer Ihre komplette Anschrift ein.

Product cross-section


Output (kW)
187 to 635 kW
Standard seasonal efficiency [to DIN]
98 % (Hs) [gross cv] / 109 % (Hi) [net cv]
Energy efficiency class
Natural gas E, LL and LPG
Application range
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Apartment buildings, large residential 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, up to 314 kW, with wide modulation range


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.