1. Battery: According to the public information of Bosch wall-hung boiler in official website, the Eurostar thermostat of Bosch wall-hung boiler has two battery slots, so two batteries are used, so the Eurostar thermostat of Bosch wall-hung boiler has batteries.
2. The battery is two No.7 batteries: there are two battery slots, so it needs the No.5 battery or No.7 battery as the power supply. The thermal efficiency of Eurostar GAZ6000W far exceeds that of ordinary traditional stoves. Even under partial load, the thermal efficiency is not less than 90%. In addition to more accurate system design, key components such as adjustable variable frequency fans are also indispensable for high efficiency. In addition, Eurostar can also be matched with a powerful OT controller, which makes it possible to further save energy in the system. "solarinside" of Eurostar control system makes it easier for boilers to connect with solar energy system, saving more energy.