A:Answer Hi Jose and thank you for your inquiry. Here are some of the differences: K525 comes in a grayish sliver color, it has an 80 oz water reservoir, the nightlight setting has customizable color options and it brews K-Mug and Vue pods 12, 14, 16 and18 oz cup sizes. The K425 Brewing System is black and silver, it has a 70 oz water reservoir, it brews K-Mug and Vue pods 12, 14 and 16 oz cup sizes, it doesn't have the nightlight setting and the LCD screen is a little bit smaller than on the K525. For a full brewer comparison checkout this link: http://www.keurig.com/Brewers/Home/Keurig%C2%AE-K475-Coffee-Maker/p/K475-Coffee-Maker#SLOT8. We hope this information is helpful.