Gas condensing boiler / solar combination ROTEX GCU compact

The ROTEX GCU compact combines modern gas condensing technology with a thermal store.

The gas condensing boiler/solar combination offers highest heating comfort and maximum water hygiene. The heating, hot water generation and a thermal store are accommodated in the smallest space. The direct combination with a thermal solar system or another heat generator is possible at any time.

System advantages

For the health of your family

Thermal store with hygienic freshwater technology.

Space-saving installation

Gas boiler and hygienic thermal store are combined in one device.

Future-proof and flexible

Direct combination with a solar system is possible and can be added anytime.

Highest heating comfort

Customized for your home: Power output 500 W to 33 kW through Intelligent Storage Management (ISM).

Product description

Highest heating comfort with maximum water hygiene

The ROTEX GCU compact combines modern gas condensing technology with a thermal store and solar storage tank in the smallest possible space. The ROTEX thermal store is a combination of domestic hot water tank and instantaneous water heater. The heat is not stored in the domestic hot water itself, but in the clearly separated tank water. Optimum tank stratification ensures that the provision of hot water is always guaranteed. The GCU compact sets completely new standards with regard to extra space and energy exploitation. An area of only 0.36 m2 (GCU compact 315/320) or 0.64 m2 (GCU compact 515/520/524/528) is sufficient to accommodate the complete heating, hot water generation and solar stratified storage tank.

The Hybrid control RoCon

The hybrid control RoCon also takes over the entire management of the thermal store, the heart of the hybrid heating system, alongside the regulation of the gas condensing boiler GCU compact. This comprehensive hybrid management ensures the highest system efficiency and optimum convenience for heating and hot water. Simple and consistent handling for the ROTEX GCU compact with intuitive menu navigation and control via your smartphone with the ROTEX App.

Innovative heat storage concept - Hygienic, flexible and future-oriented

All ROTEX products with the ECH2O label are characterized by a unique heat storage principle. Particularly space-saving, with the highest warm water comfort and open for additional heat sources.


The hybrid heating centre – open to all energy types

The GCU compact internal unit can furthermore be used as an efficient thermal store for additional heat sources. Apart from a solar thermal system, it can also be backed up for example by oil, gas and pellet boilers or wood burning stoves with back boilers. If you do not install a solar thermal system immediately, one can be retrofitted quickly and easily at any time.

Structure and function

Lambda - Gx: Automatic adjustment to the gas types for best controlled incineration

The GCU compact gas condensing boiler/solar combination is fitted with an automated combustion control. This means the system is able to adapt to different gas types, so enabling the gas condensing boiler to be operated efficiently. It ensures that the combustion of most types of gas, including LPG, can be very tightly controlled. Consistent application of condensing technology and the combination of a condensing boiler and thermal store, work together to keep energy consumption low.

Maximum water hygiene - every day

Thanks to its construction, the GCU compact has an integral, state-of-the-art stratification store for hygienic water provision. Sludge and rust deposits, sedimentation and even the growth of dangerous legionella bacteria, as can occur in many large containers, are now no longer possible.

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

Using Intelligent Store Management for gas condensing boilers and thermal stores simultaneously, maximises energy efficiency, as well as heating and DHW convenience. It can also cover the energy demand of low energy houses and highly insulated new buildings, which is minimal. In existing housing stock, intelligent control systems optimise burner runtimes and thus reduce emissions, while increasing energy efficiency.

Low scaling

On commissioning, the storage tank is filled with tap water which is not exchanged during operation. Thus, only the lime contained in this water can be deposited; all the heat exchanger pipes remain free of limescale, as does the electric immersion heater, which is available as an option. On the inner surface of the heat exchanger pipes, the high flow speed when the water is removed releases smaller scale deposits.

Long-life and safe

The materials used (plastic and stainless steel) ensure the ROTEX thermal store has a particularly long life and will provide you with hygienic hot water for decades.

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

Follow Us