Two separate boilers to be able to deliver espresso and steam independently, without altering the thermal equilibrium also severe working conditions, thanks also to the volumetric pump and the possibility of direct connection to the water mains. AISI316 stainless steel water / steam boiler controlled by pressure switch, with exclusion switch for energy saving. AISI 316 stainless steel coffee boiler with temperature control managed by a PID thermostat, which allows you to adjust the temperature of the water supplied by the group in a range from 80 to 100 degrees ° C in order to optimize extraction according to the different types of coffee and different roasts, while maintaining constant thermal stability.