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It is perfectly possible to use that pipe, as long as the water pressure is sufficient, it will not affect the use. You can ask the plumber master to connect a tee to this pipe...
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The water heater must be installed in the public bathroom, and the pipe can be connected to the main bathroom!
It's not a matter of a few bathrooms, but also the size of the house, and it is impossible for a small house to have two bathrooms!
If you live alone or as a couple, there is no need, if you have other family members and children, think about it.
As long as you have a large space, the pipeline is easy to solve. Just asked the engineering department.
If you have more than 2 rooms, you need to have 2 bathrooms, so you can imagine that everyone has to use the bathroom when you get up in the morning, and 1 is very inconvenient.
Even if there is no odor, there will be moisture, so try to separate it. >>>More