The K3500 is a commercial-grade single-serve coffee brewer from Keurig — designed primarily for offices, breakrooms, and other high-traffic environments rather than typical home kitchens.
It’s meant for continuous use and back-to-back brewing. It’s built tough and configured for heavy usage (e.g. many people throughout the day).
Instead of a small water reservoir like many home Keurigs, the K3500 is designed to be plumbed directly into a water line. That means you don’t have to refill water manually — ideal when you need many cups over time.