Yes. There are two pipes from the solar water heater to the room, namely the outlet pipe and the water inlet pipe, and the heating wire is installed on the solar outlet pipe. The solar heating wire therefore passes through the water pipe. Solar energy refers to the energy of thermal radiation from the sun (see the three modes of propagation of thermal energy: radiation), and its main manifestation is often called solar rays.
From the point of view of using solar water heaters, there is no problem in running the water pipes through the bathroom drain.
The flow of water pipes from the drain pipe is not an inevitable factor in water pipe leaks. Water leaks occur due to abnormal conditions or abnormal conditions in the connecting parts of water pipes.
From the bathroom exhaust point of viewain, running the water pipe from the drain pipe will aggravate the exhaust effect, and when the water temperature in the water pipe is low, condensation will occur on the outer surface of the pipe. Water pipes need an insulating outer layer.