Vitoladens 300-C - First choice if it comes to modernisation

Take advantage of these benefits

  • Highly efficient and compact floor standing oil unit condensing boiler
  • Maximum energy utilization with minimum dimensions
  • Biferral composite heating surface with stainless steel Inox-Radial heat exchanger
  • Two-stage or modulating Compact blue flame burner for open and balanced flue operation
  • Quiet operation through integral silencer
  • Standard seasonal efficiency  up to 98 %
  • Easy-to-operate Vitotronic 200 control unit with plain text and graphic display

The future proof condensing boiler

Investing in a Vitoladens 300-C pays off in only a few years thanks to the reduced annual consumption of costly fuel oil. Our condensing boiler uses far less than older boilers on account of its high efficiency, ensuring savings on fuel oil and costs every year. With its space saving assemblies, this oil condensing boiler is extremely compact and can be installed practically anywhere. This makes it ideal when modernising heating systems. In new build, the space it would have taken up can be used for other purposes.

Powerful and efficient

With three output stages up to 28.9 kW, the oil condensing boiler is suitable for detached or two-family houses. The two-stage or modulating Compact blue flame burner with integral silencer matches its output to the heat demand, ensuring maximum energy efficiency. The technology is designed for use with all commercially available types of fuel oil. 


Product cross-section


Output (kW)
10.3 to 28.9 kW
Standard seasonal efficiency [to DIN]
98 % (Hs) [gross cv] / 104 % (Hi) [net cv]
Energy efficiency class
All types of commercially available low sulphur fuel oil can be used – including fuel oil DIN 51603-6-EL A Bio 10: low sulphur fuel oil EL with up to 10 % bio-components (FAME)
Application range
Detached and two-family houses, new build and modernisation projects
Einfaches RGB
Vitotronic 200 control unit with plain text and graphic display, can be operated by means of the Vitotrol app
DHW heating
Additional DHW cylinder required, resulting in a high level of DHW convenience
Additional features
With its space saving assemblies, this oil condensing boiler is extremely compact and can be installed practically anywhere
Produktschnitt Öl-Brennwertkessel Vitoladens 300-C


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.