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The bathroom water is not hot, maybe you haven't done a good job of keeping warm, and then put more water for a while to see if the water temperature has risen.
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That means it's still a long time in the bathroom, and you need to wait for a while.
The closed circuit in the living room and another room may not be available to you. Buy two joints "a few dollars" and you can connect them yourself.
You are not very clear, in short, the distance from the gas water heater to the faucet should not be too far, otherwise the water to the faucet will not be very hot.
If the pipe of the toilet can release water when the solar energy in your home was originally installed, then it is possible that the pipe is blocked by sediment after a long period of use, resulting in you not being able to release water, so you can try to unscrew this triangle valve and flush it with tap water to see if there is any sediment, and it should return to normal after dredging.
If it doesn't flow back, it may be that the water has been stored in it for a long time, and the water has deteriorated, or it may be that there is a problem with the tap water.
If the toilet is not blocked, but the pressurized water is not strong, it should be the accessory under the toilet.