Vitoladens 300-T - the world champion

Take advantage from these benefits

  • Durable biferral composite heating surface, proven in millions of boilers
  • Corrosion-resistant stainless steel Inox-Radial heat exchanger
  • Standard seasonal efficiency up to 97 %
  • Easy accessibility of the heat exchanger surfaces for cleaning
  • Flexible siting through open or balanced flue operation
  • Quiet operation through integral silencer
  • The main components are delivered separately (boiler body, heat exchanger, burner, etc.), making handling on site easier

With the Vitoladens 300-T, you'll always be on the safe side. For modernisation or new build,
this floorstanding oil condensing boiler will win you over with its high operational reliability and attractive price.

The world champion

The Vitoladens 300‑T oil condensing boiler is a real world champion. Very attractively priced, it is the world's bestselling boiler. This floorstanding condensing boiler boasts exceptional operational reliability and a long service life. It is economical in its consumption of valuable fuel oil, and the use of high quality materials and proven components keep maintenance costs to a minimum.

In the output range from 35.4 to 53.7 kW, the Vitoladens 300-T covers a great variety of applications – from detached houses and apartment buildings to smaller commercial operations.

In good shape

With its silver high-tech appearance, this condensing boiler will look good in any surroundings, an advantage as this boiler does not need to be hidden away in a conventional boiler room. It will look the part even in your hobby room or utility room.


Product cross-section


Output (kW)
35.4 to 53.7 kW
Standard seasonal efficiency [to DIN]
97 % (Hs) [gross cv] / 103 % (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
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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
Downstream self-cleaning stainless steel Inox-Radial heat exchanger for the utilisation of condensing technology
Produktschnitt Öl-Brennwertkessel Vitoladens 300-T


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.