The Bosch Greenstar boiler uses a full modulating fan that increases its energy efficiency significantly, making it eco-friendly. The purpose of the modulation fan is to ensure that the boiler has the right amount of air at all times for optimal efficiency with combustion.
The Bosch Greenstar boiler also comes with a digital thermostat and an outdoor reset control. The interface can program as many as six automatic switching times during a 24-hour period. This interface can be installed inside the appliance or mounted on a wall for easier access. Modifying temperatures for different times of the day keeps the boiler from providing unnecessary heat levels when the house is empty.