Water is the most valuable natural resource after air without which a man cannot survive. The growing demand is forcing fresh water beyond natural replenishment rates. This nictitates finding water conservation opportunities. We recognize that there is significant cold water wastage at public places as users try to find a proper setting of the mechanical water mixer. There is in need of a smart system that can handle the demand of water and simultaneously serve the users with water at a constant and comfortable temperature as well as regulated pressure. In this paper, a smart centralized water mixing system has been proposed that provides water to users at a reasonable temperature and flow rate. This will help in eliminating mechanical mixing and use of manual valves. The proposed system is designed using different sensors and controllers in such a way that it is easy to install and it also overcomes the drawbacks of the present system with enhanced features and proper quality of service. The fixed ratio system and the proposed systems are simulated using the tools provide by Matlab. The obtained results show that with the integration of Wireless Sensor Network (WSN) and a control system with the conventional physical system, we can serve users with water at the desired temperature and flow rate. The proposed system provides significant water and energy conservation on top of improved quality of service to users.