At the heart of the Breville RM-BES900XL Certified Remanufactured Dual Boiler is its dual stainless steel boiler heating system with electronic PID temperature control. You can extract your shot at the right temperature, delivering optimal flavor, while simultaneously steaming your milk to cafe quality with the swivel steam wand. There is a Heat Exchanger and another element in the group head, ensuring the entire system maintains a consistent temperature. The Dual Boiler also features an Over Pressure Valve. This commercial feature limits the 15 Bar Italian pump 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. But there"s much more to this machine for the coffee geek. At the same time we"ve kept it simple with user-friendly features. An optional Auto Start setting preheats the machine at a programmed time; a top-fill 84 fl. oz. (2.5L) water tank ensures easy access and the dedicated hot water outlet makes it faster to pre-heat cups or prepare an Americano. There is also a shot clock and pressure gauge to help you improve your barista skills over time. All you"ll need are some freshly ground beans and a bit of practice to rival the best cafe.