Oil condensing boilers

High efficiency

Modern condensing appliances are designed to use virtually the entire energy content of the fuel to transform it into heat. Compared to standard and low-temperature technology, condensing boilers reuse the heat energy of water vapour emitted during combustion in the exhaust gas. The condensation heat is then returned to the system, which enhances the heat yield and help save fuel, such as heating oil. Oil-fired condensing boilers thus achieve the highest efficiency with the lowest fuel consumption.

Condensing boilers running on oil are especially suited for off grid isolated buildings, for both residential and commercial purposes.

Quality heating fuel

Low-sulphur heating oil (or extra-light (EL) heating oil) is a quality fuel, produced in accordance with existing standards. It is ideally suited to the requirements of condensing boiler technology and demonstrates several essential advantages over normal heating oil: it has a low sulphur and a low nitrogen content. The flue-gas emissions are thus minimised. EL heating oil can also be used in burners without preheating. This results in boilers with high levels of efficiency throughout the year and a high degree of reliability, therefore reducing the maintenance requirements for boilers and burners.

Combining renewable energies

The oil condensing technology can be easily teamed with a solar thermal system. The solar collectors support the domestic hot water preparation and contributes to meeting the space heat demand. The combination of a solar thermal system with an oil-fired heating system reduces oil consumption by 10–20%.

Moreover, liquid biofuels (produced from biomass) are already added to heating oil. They have a high energy density and can be burned without almost any residue or pollutants using modern combusting technology. One example is the so-called “bio-heating oil”, a blend of low-sulphur heating oil and at least 3% of biofuel. Bio-heating oil can significantly help to reduce the demand for mineral oil, reduce greenhouse gas emissions and preserve resources. However, these benefits can only be achieved if biofuel production is sustainable, if it does not compete with food production for resources, and if biofuels are used efficiently.


  • Increased efficiency and reducing emissions
  • Reducing demand for heating oil
  • Combinable with solar energy and biofuels
  • Suitable for modernisation in existing buildings and new buildings, especially in remote areas and those not connected to gas networks