Frequently asked questions

Any more questions? We have compiled the most frequent questions for you in the FAQs. Were you unable to find what you were looking for? Just get in touch with us. We will happily take the time to answer any questions you may have. 



The BlueGEN has integrated heat recovery. This allows the waste heat from the fuel cell module to be used to heat up to 200 litres of water a day – that is enough for an average household’s daily use in Germany. This water can be used as domestic hot water, and in certain cases to supplement the heating as well.

Thanks to its high efficiency, the BlueGEN emits only about 240 g of CO2 per kilowatt hour (kWh) with an electrical output of 1.5 kW. Compared to for example the German power grid, with emissions of about 527g per kWh (in 2016) you can therefore cut more than half the CO2 emissions.
Due to the operational mode of the fuel cell the value of CO and NOX are also significantly lower compared to a conventional gas appliance.

No, various safety systems and gas valves prevent gas from escaping.

If there is a gas failure, the BlueGEN will stop operation and send a fault report.

If there is a power cut, the BlueGEN will automatically disconnect from the network and reduce output to a minimum in order to power itself. Thus the BlueGEN continues to operate and will increase output as soon as the power grid is available again.

The BlueGEN needs oxygen from the air for the internal process of converting natural gas.

The internal process of converting natural gas is most efficient when using water. Water consumption depends on what heating system is connected and amounts up to 1.5 litres an hour, in practice about 36 litres a day.

Without heat recovery, the maximum flue gas temperature is around 200 °C. However with active heat recovery, the temperature is considerably lower.

An Internet connection is absolutely necessary for remote monitoring and control. The average data volume is around just 10 MB a month.

The temperature of the water depends on the temperature of the heat storage and the volume flow of the overall hydraulic system. At 2l/min the BlueGEN  increases the temperature  between 1 and 6 °C. So if the water within the heat storage has a temperature of 30 °C in the tapping zone, the BlueGEN would raise this temperature by about 4 °C and the water would re-enter the tank with a temperature of 34 °C. The following applies here: The higher the storage temperature is, the less the temperature will increase. At a water temperature of 65 °C, the temperature would be increased by about 1 °C.

The BlueGEN sets up its own VPN tunnel for the connection to the SOLIDpower servers. Available Internet access is all that is needed for this; access to the firm’s network is not required.

The BlueGEN does not have a physical emergency-off switch. However the system has been fitted with intelligent and repeatedly tested controls, which are able to put the appliance into the so-called survival mode or shut down the appliance completely, should a problem occur.

Yes, if you can ensure sufficient ventilation.

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