Condensing Oil Boilers

By using a Viessmann condensing boiler to convert fuel oil into heat, you are making an active contribution towards using resources efficiently and saving energy, thanks to the boiler's unbeatably high efficiency of 98 percent (relative to the gross calorific value (Hs)).

Our oil condensing boilers come with the future built in. They are designed to accommodate a changeover from fossil oil to fuel oil mixed with a certain percentage of bio-oil, which means that they can be run partially on renewables.

Oil boilers are still one of the most frequently used heating systems. No wonder, because the fuel is rich in energy and the system is considered safe. If homeowners decide to buy a Viessmann condensing boiler for oil, they also make an active contribution to conserving resources and energy. Because with an unrivalled high efficiency, the heating oil used is converted into heat by up to 98 percent.

Viessmann oil condensing boilers are already future -proofed. Because ex works they are prepared for a switch from fossil oil only to heating oil with a proportion of bio-oil and can thus also be operated with regenerative energy sources. In this way, every owner of an oil-fired heating system with oil condensing boiler makes an active contribution to climate and environmental protection. Viessmann has the right oil condensing boiler for every heating requirement.

You can further cut your costs and carbon footprint by using solar heating technology in conjunction with your oil condensing boiler.

To take advantage of the free energy provided by the sun, we recommend that every new oil fired condensing boiler is combined with solar collectors. When you operate one of these boilers in conjunction with Vitosol solar collectors to support heating, the requirements of the Renewable Energies Heat Act and the Renewable Energies Heat Act (EWärmeG) (Baden-Württemberg) are met. This means you can apply for public subsidies for your investment.

As well as providing oil condensing boilers, we offer heating oil tanks that ensure economical, space-saving and problem-free storage of heating oil. The tanks in our Vitoset range are safe for use in heating systems in a range of properties, including family homes, apartment buildings, residential complexes or commercial buildings. Whether you’re building a new property or extending or renovating an existing one, our Vitoset tanks could be ideal.

With the free ViCare app, your new oil condensing boiler can be conveniently controlled online - even when you’re away from home. The only thing you need in order to experience this digital operating convenience is the Vitoconnect Internet interface, which can be set up by your heating engineer on request during the installation.

With the free ViCare App, your new oil condensing boiler can then be conveniently controlled online via app - even from your holiday resort or workplace. For this digital operating convenience, only the Vitoconnect Internet interface is required, which can be set up by your heating engineer on request during the new installation.

During the combustion of heating oil, hot flue gases are produced in addition to heat, which in older boilers are routed outside through the chimney. This is necessary for two reasons. On the one hand, some components of the flue gases are very acidic and can damage the system itself and the flue gas lines in the long term. On the other hand, the flue gases must not condense, as otherwise they become too heavy and can no longer escape from the chimney. This constructional procedure leads to the fact that the heat hidden in the exhaust gases remains unused.

Compared to older condensing boilers for oil from Viessmann, condensing boilers also use this latent "heat of condensation". This is released when the flue gases cool down and the resulting hot water vapour condenses. In this way, up to 98 percent of the energy content of the heating oil is converted into heat. Detailed descriptions of this procedure can also be found in the section Functioning of oil condensing technology.