The invention is a drinking fountain with simple structure does not need a warm-water storage tank, which will reduce the production cost, saving energy, providing cheap selling price, which has market competitiveness. It can lower the temperature of hot water to make warm water when you need. Users can choose what they want either hot water or warm water immediately. Features: 1. It can heat the unboiled water gallbladder with FIR ceramic heater. 2. The thermal efficiency up to 90% and save 30% electricity fee. It can save lots of energy to make unboiled water to become hot water faster.