The Dual Boiler offers commercial features and performance, in a domestic footprint. Espresso perfection requires precision temperature and pressure control, consistently, every time. At the heart of this machine is its dual stainless steel boiler heating system. The espresso boiler, for the espresso shot, is PID temperature controlled, while a separate steam boiler offers instant and powerful steam on demand. So you can extract your shot at the right temperature, delivering optimal flavor, while simultaneously steaming your milk to cafe quality. What's more, there is another element in the group head, ensuring the entire system maintains a consistent temperature. The Dual Boiler also features an Over Pressure Valve (OPV) which limits the maximum pressure throughout the extraction, preventing bitter flavors in the shot. It also offers a true low pressure pre-infusion, which gradually increases the pressure to gently expand the grinds for an even extraction.