再談房子的熱水問題

各位大蝦要詳細的情況，tenant 回信如下，本人還是不知何種問題所在，再請各位明白的大蝦幫忙分辨：

The tenant replied me about the hot water problem:

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Sometimes hot water does not come in the master bedroom shower at all. or none of the faucets

If we are using shower in both bathrooms, the water pressure is very low and water is not hot.

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Thank you!