Oil condensing boiler

The oil boiler with a large modulation range

The modulating A2 constantly adjusts its output in line with demand. The ROTEX A2 is ideally suited to replacing older boilers, thanks to the great flexibility it offers when integrated into existing systems, plus its low weight and compact dimensions. Thanks to the Smart Start function, the ROTEX A2 is also a good choice in new buildings. It can already handle the lowest heat requirements and delivers the highest DHW convenience.

System advantages

An oil heater as made for you

The A2 oil condensing boiler is ideal for heating modernisation due to its small footprint and simple chimney refurbishment.

Innovative technology

Next generation modulating burner. With ISM modulation up to 500 watts.

Future-proof and flexible

With ROTEX thermal store direct combination with solar system or woodburning stove with back boiler possible.

Control via smartphone

Intuitive electronic regulation and control with the ROTEX app.

Product description

A boiler with a large modulation range

The heat demand of a building varies widely depending on weather conditions and utilisation patterns. The modulating A2 constantly adjusts its output in line with demand. This ensures optimum energy utilisation. It has a particularly large modulation range of 1:25. This can even be broadened to 1:64 with the new Smart Start function.

The A2 oil fired boiler defines the current state of modern condensing boiler technology. Minimal emissions, ease of operation and maintenance and maximum energy efficiency characterize the A2 oil condensing boiler. It is ready for bio oil (B10) and all common fuel oil types.

Intelligent controls

The ROTEX RoCon digital control unit meets the most demanding standards and is intuitive to use. Values and parameters are displayed clearly. All operating modes and parameters can be set and changed quickly and easily. Key system parameters can be checked and adjusted by a contractor. The heating water temperature is regulated according to the outdoor temperature. The control unit automatically detects when it‘s winter or summer, switching heating mode on or off accordingly. It features individually adjustable time programs for convenient control of the heating circuit and domestic hot water heating. A room controller for regulating and monitoring the heating system can also be added.

The hybrid manager

Apart from A2 control functions, the RoCon hybrid control unit also manages the thermal store, which is the heart of the hybrid heating system. This comprehensive hybrid management system ensures the highest levels of system efficiency and optimum convenience for central heating and domestic hot water. With its intuitive menu navigation and optional control via smartphone with the ROTEX app, the ROTEX A2 is straightforward and reliable to use.

Enjoy convenient control of your ROTEX heating system from your smartphone

Our intuitive app offers you a wide range of options. Set the required heating temperature – easily and conveniently. The ROTEX Control app also enables you to change time programs and operating modes. Additional information is available, too – as well as the outdoor temperature, the app also displays weather updates and forecasts for the next three days.


ROTEX‘s oil condensing technology is a worthwhile investment

Choosing the right boiler for your oil heating system is a decision that will affect you for the next 15 to 25 years. Over this period, the cost of the fuel used will prove to be a much bigger outlay than the boiler‘s original purchase price. Therefore, this is the area where you can make the greatest savings.

Advanced oil heating system

A modern oil heating system will fit seamlessly into your home. Oil condensing boilers minimise emissions, are very easy to operate and convert fuel into available heat with virtually no losses. The fuel supply can be stored in the same room as the boiler thanks to modern safety tanks which are fitted with odour barriers. Combining the boiler with a solar thermal system and hygienic thermal store add the perfect finishing touches.

Suitable for boiler replacement or in new buildings

The ROTEX A2 is ideally suited to replacing older boillers. It can already handle the lowest heat requirements and delivers the highest DHW convenience, so it is also suitable for new buildings. The ROTEX oil condensing boiler is approved for installation directly next to safety fuel oil tanks. Room air independent operation is integrated as standard.

Structure and funktion

Intelligent Storage Management (ISM) - power output from 500 watts

Intelligent storage management not only maximizes energy efficiency, but also heating and hot water comfort. So even the smallest heat demand can be covered. At the same time, it leads to an optimized burner runtime and thus to lower pollutant emissions and higher energy efficiency.

With the optional Smart Start kit, the A2 can deliver 0-100 percent output to meet demand and provide continuous heat distribution. The content of the thermal store then serves as an active buffer, including for the heating system. With ISM optimisation, even the lowest heat requirements of 500 watts or more can be covered in the building, yet you can still have as much hot water as you need. Frequent cycling is avoided by optimising the oil condensing boiler’s burner runtimes. Fewer burner starts mean much lower emissions of harmful substances and increased energy efficiency. With this optimisation, ROTEX is well able to meet the steadily increasing need for a constant and immediate supply of hot water – especially with the trend for ever more luxurious bathrooms and multiple shower units in our homes, but decreasing heating requirements as building insulation improves

Provides clean and hygienic domestic hot water at all times

The ROTEX Sanicube thermal store is the perfect complement to the ROTEX A2 heating system, having been designed with the latest heating technology and domestic hot water hygiene standards in mind. It has been specially engineered to guarantee domestic hot water of the highest quality. Sludge and rust deposits, sedimentation and even the growth of dangerous legionella bacteria, such as can be found in many large tanks, cannot occur here.

Innovative heat storage concept - Hygienic, flexible and sustainable

Alle ROTEX Produkte mit dem ECH2O-Siegel zeichnen sich durch ein einzigartiges Wärmespeicher-Prinzip aus. Besonders platzsparend, mit höchstem Warmwasserkomfort und offen für zusätzliche Wärmequellen. The innovative heat storage concept is used on the A2 when you combine the oil boiler with a Sanicube thermal store.

Advanced fuel oil storage

In combination with the ROTEX variosafe twin wall, odourproof fuel oil tank, the oil can be stored in the same room as the boiler – even right next to it. You can then put the space previously used to store your fuel oil to better use, e.g. convert it to a hobby room or sauna. And no need to wall the tank off or use an oil drip pan. The ROTEX variosafe fuel oil tank with watersafe equipment is even approved for siting in areas prone to flooding. It is compact enough to fit through standard sized doors. Ideal for modernisation projects.

Energy efficiency class

Energy efficiency label for heating systems – safe in the knowledge it‘s ROTEX

All ROTEX products are tested and meet the criteria of the Ecodesign Directive. For both individual products and packaged solutions, energy labels are a reliable indicator of the precise efficiency class. Perfectly matched in terms of their individual components, our complete systems provide both maximum convenience and the highest safety standards.

The combination with a thermal solar system is the most effective way to improve the efficiency class of the entire system.

Information about the energy efficiency labels

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