Novel water tank

The utility model discloses a novel water tank, which comprises a tank body and a heat exchange pipe assembly, wherein the heat exchange pipe assembly is coiled on the outer wall of the tank body, and a water inlet and a water outlet are arranged on the tank body. The utility model has the key points that the heat exchange pipe assembly comprises at least two parallel heat exchange branch pipes, and an inlet and an outlet are both arranged on each heat exchange branch pipe. High-temperature gaseous cooling media are uniformly divided into the heat exchange branch pipes of each small loop through a gas-distributing mode, so that the utility model avoids the loss or the reduction of the heat exchange capability of several circles of heat exchange pipes close to the outlets, and improves the heat exchange efficiency of the water tank, thereby the hot-water production capability of a heat pump hot-water machine is enhanced. In addition, under the same hot-water production capability, the circle number of the heat