Vitoradial 300-T - Efficient with condensing technology

Take advantage of these benefits

  • Available with either gas or oil burner
  • Up to 97 percent of the fuel used (oil) is converted into heat
  • Environmentally responsible operation thanks to long burner runtimes; large water content means less burner cycling
  • Compact design with the low appliance height (important for modernisation projects)
  • Easy-to-use Vitotronic control unit with plain text and graphic display

High efficiency with two-stage heat recovery

The Vitoradial 300-T is the innovative combination of the Vitoplex 300 low temperature boiler with an Inox-Radial heat exchanger directly attached, for the utilisation of condensing technology.

The proven convection heating surfaces combined with the corrosion-resistant heat exchanger enable highly efficient two-stage heat recovery.

The Vitoradial 300-T is suitable for operation with all commercially available types of extra light (EL) fuel oil and natural gas. Its output is 101 to 545 kW.

The compact design with low build height makes the Vitoradial 300-T an ideal choice when modernising, e.g in apartment buildings.

The user benefits from easy cleaning of the combustion chamber and low maintenance costs.

Utilising condensing technology with the Inox-Radial heat exchanger

The Inox-Radial heat exchanger provides condensing technology even for medium-sized boiler systems, such as the Vitoradial 300-T. It raises the boiler's efficiency by 8 percent, to a total of 97 percent.

This principle ensures that combustion and condensation occur in physically separate locations and the combustion gases condense without leaving any residues behind.

Comfortable and powerful Vitotronic control

Comfortable and powerful Vitotronic control

The Vitotronic control system with a large colour touch display allows fast commissioning by means of an assistance function as well as simple operation. Via the integrated LAN interface, the boiler can be directly connected to the Internet for remote monitoring. The Vitosoft 300 service tool communicates directly via WLAN. Energy consumption can be easily viewed via the control energy cockpit.

Product cross-section


Output (kW)
101 to 545 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
Application range
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Apartment buildings, large residential buildings, commerce, municipal offices, new build and modernisation projects
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
Integral Therm-Control start-up system for easy hydraulic connection – no shunt pump or return temperature raising facility required
Produktschnitt Öl-Brennwertkessel Vitoradial 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.