Oil condensing boilers use state-of-the-art heating technology

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.

The image illustrates an oil condensing boiler with an integrated DHW cylinder.

Saving up to 35 percent energy with a modern oil condensing boiler

Older boilers are generally inefficient and often consume much more fuel than necessary. In the UK, there are many heating systems over 25 years old still in operation. By replacing a technically obsolete heating system with a highly efficient oil heating system with condensing technology and in combination with solar technology, end consumers could save up to 35 percent energy. 

Combining a new oil condensing boiler with solar collectors

The free energy from the sun for central heating backup and DHW heating is still underused. Solar technology has become more than advanced and very cost-effective in recent years. In addition, the acquisition is supported by the state with high subsidies. Today, every new oil fired condensing boiler should also be combined with solar collectors to use free solar energy, especially since Viessmann oil fired condensing boilers are already designed for the use of solar energy.

When operating an oil condensing boiler 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. The client can apply for public subsidies for this investment.

Vitoset heating oil tanks for your new oil condensing boiler

The complete system of a condensing boiler for oil also includes economical, space-saving and problem-free storage of heating oil. A heating oil tank from the Vitoset range is a safe solution for your oil condensing boiler for new builds, extensions or renovations - in single-family homes or apartment buildings as well as for residential complexes or commercial buildings.

Operating your new oil condensing boiler via the Internet

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.

How oil heating with condensing technology works

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.


The picture illustrates a heat exchanger that is essential for an oil condensing boiler.

Oil condensing boiler with Inox-Radial heat exchanger

Oil-fired heating is an environmentally friendly and economical heating technology with which energy can be saved efficiently. All Viessmann oil condensing boilers are equipped with the stainless steel Inox-Radial heat exchanger. This indestructible technology stands for a high efficiency of 98 percent and is characterised by a long service life and safe and efficient operation. Find the right oil condensing boiler for you and your heat requirements from this overview.


Efficient heating with oil condensing technology

Condensing technology not only utilises the heat generated by combustion as a measurable temperature of the hot gases (net calorific value), but also the water vapour content (gross calorific value). Condensing boilers are able to extract almost all of the heat contained in the flue gases and to convert it into heating energy.

Condensing boilers use high performance heat exchangers. These cool the flue gases before they escape through the chimney, to the extent that the water vapour contained in these gases is deliberately condensed. This releases additional heat which is transferred into the heating system.

With this technology, an oil condensing boiler achieves a standard seasonal efficiency [to DIN] of up to 98 % (relative to Hs). An oil condensing boiler is particularly energy efficient, looking after both your wallet and the environment.

Gross calorific value (Hs)

The gross calorific value (Hs) defines the amount of heat released by complete combustion including the evaporation heat latent in the water vapour of the hot gases.

Alle Öl-Brennwertkessel von Viessmann werden heute mit dem Inox-Radial-Wärmetauscher aus Edelstahl Rostfrei ausgerüstet.

Heating with oil

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.