Bottomless firewood oven energy-saving water heater

The utility model discloses a firewood oven energy-saving water heater, which comprises a water heater body, an inlet pipe, an outlet pipe, a valve, a water faucet, a glass tube and a supporting leg. The water heater is a closed hollow cylinder ring; the wall surface of the water heater body is provided with a rectangle opening. The utility model can make full use of waste heat, has high heat utilization, low construction cost and convenient installation and use, and can save firewood so as to not only save labor and materials, but also protect the forest. Moreover, the utility model has great popularization value in the countryside.