Vitoradial 300-T

Efficient heating with condensing technology

Low temperature oil/gas boilers, Three-pass boiler in cast sectional design ■ For operation with modulating boiler water temperature

  • Larger residential
  • Ideal for
  • Up to
    545 kW
  • Available for
  • Available for
  • Compact
  • Text & graphic
  • Made in
  • 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

Key Benefits

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.

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.

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. As a result, the boiler’s efficiency is increased 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.

Triplex pipes for a heating surface 2.5 times larger

The multi layered convection heating surfaces of the Vitoradial 300-T comprise telescopic steel pipes pressed together for heat transfer. The internal pipe surrounded by folded linear fins provides a heating surface 2.5 times larger than that of smooth pipes.

The heat transfer is subject to the different intervals between the press points, i.e. the back area of the triplex pipes, through which slightly less hot combustion gases circulate, transfers less heat to the boiler water. This way, the surface temperature remains above the dew point, the formation of condensate is counteracted and corrosion damage is prevented.

Compact design - ideal for renovations

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

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Product Data


The Vitoconnect 100 is a WiFi interface to establishes the connection allowing you to remotely operate your heating system by app, as well as supporting remote maintenance via Vitoguide.

Vitotrol app

With the Vitotrol app and a smartphone, controlling Viessmann heating systems couldn't be easier. Intuitive and convenient operation via the internet is possible from anywhere and at any time.

Technical Guide All

Data Sheet Type VR3, 101-545 kW

Installation Instructions Type VR3 101-335kW

Service Instructions Type VR3 101-335 kW

Installation Instructions Type VR3, 425 and 545 kW

Service Instructions Type VR3, 425 and 545 kW

Operating Instructions Vitotronic 100 CC1E

Operating Instructions Vitotronic 200 CO1E

Operating Instructions Vitotronic 300-K


Vitoradial 300-T

Vitoradial 300-T

Output (kW)

Vitoradial 300-T

101 to 545 kW

Standard seasonal efficiency [to DIN]

Vitoradial 300-T

97 % (Hs) [gross cv] / 103 % (Hi) [net cv]


Vitoradial 300-T

All types of commercially available low sulphur fuel oil can be used

Application range

Vitoradial 300-T

Apartment buildings, large residential buildings, commerce, municipal offices, new build and modernisation projects


Vitoradial 300-T

Vitotronic 200 control unit with plain text and graphic display, can be operated by means of the Vitotrol app

DHW heating

Vitoradial 300-T

Additional DHW cylinder required, resulting in a high level of DHW convenience

Additional features

Vitoradial 300-T

Integral Therm-Control start-up system for easy hydraulic connection – no shunt pump or return temperature raising facility required

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