Internet of Things (IoT) technology is fast growing as the major force which changes the world. It is gradually entering our daily lives in the form of connected TVs, smart watches, Bluetooth smart light bulbs, and even more intelligent devices such as Wi-Fi air conditioners. This paper presents the design and implementation of a prototype IoT-based system of home water purifiers that enables predictive maintenance, named the i-Water system. The designed system enables water purifier suppliers to monitor and gather information on working status of their customers’ devices in real-time. The profiles of water purifiers are stored and processed by a cloud server on a 24/7 basis. This allows the equipment suppliers to provide better customer support and enhance business efficiency.