The Seaco Xelsis an Saeco Exprelia both use the same Saeco technology for brewing, cleaning and maintenance. They both have stainless steel boilers, and use the same 15 bar pump for brewing which is plenty of pressure to create the 8 to 9 bars required to brew quality espresso. The water reservoirs both hold a generous 54 ounces of water for brewing and steaming, and the milk carafe used by both these machines have the same 17.25 ounce volume.