The hot water function/tap stopped working after 4-6 months

It keeps water cold and is easy to load. However, after 4-6 months the hot water stopped being hot. It is funny because I was always careful to turn it off at night when I left the office. I didn’t want to burn out the hot water heater.... It is sitting next to a Keurig from which my patients and I can get hot water so I didn’t send it back.

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