Multifunctional pipeline for condensing volumetric gas water heater

The multifunctional pipeline comprises a first pipeline body and a second pipeline body, a horizontal section port of the first pipeline body is a first connecting port and is communicated with the bottom of a condensation volume type gas water heater body, and a vertical section port of the second pipeline body is a second connecting port and is communicated with the horizontal section of the first pipeline body. The vertical section of the first pipeline is located outside the condensation volume type gas water heater body and is close to the outer wall of the condensation volume type gas water heater body, a port of the vertical section of the first pipeline is a smoke exhaust port and faces upwards back to the ground, and a port of the horizontal section of the second pipeline is a condensate water exhaust port and is back to the condensation volume type gas water heater body. The gas-fired water heater is used for solving the problem that the gas-fired water heater is easy to corrode, two-in-one discharg