Energy-saving water heater

The utility model discloses an energy-saving water heater. A burner and a gas chamber (4) are arranged inside a casing. The energy-saving water heater is characterized in that the burner is composed of four fire jet pipes (3), the upper ends of the fire jet pipes (3) penetrate through the same partition board (9), the lower ends of the fire jet pipes (3) are connected with the gas chamber (4), an air inlet damper (5) is arranged on the fire jet pipe (3) close to the gas chamber (4) and is provided with a rotatable blocking board (6), and the blocking board (6) can adjust the size of an air inlet of the air inlet damper (5). The energy-saving water heater has the advantages that the water heater is simple in structure, unique in design, more efficient in combustion and capable of saving gas and reducing exhaust fume, and further cannot pollute environments.