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The difference is that the 400 doesn't come with a water filter kit.
Sorry, there was a problem. Please try again later.Hi Geo and thank you for your inquiry. The K400 has a 70 oz water reservoir and the K500 has an 80 oz water reservoir. The K500 has an XL color touchscreen, hot water on demand option and a customizable night light, the K400 does not. For more information on our brewers check out our brewer comparison page at http://www.keurig.com/Brewers/Home/Keurig%C2%AE-K475-Coffee-Maker/p/K475-Coffee-Maker#SLOT8. We hope this information is helpful.
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