The answer to 'why is my pipe no hot water' is that there are several common causes, including a malfunctioning water heater, a problem with the water supply, or a blockage in the pipes. The most likely symptoms are no hot water coming from the faucet, lukewarm water, or the water heater not heating up properly.
Some potential solutions include checking the water heater's thermostat and heating element, clearing any blockages in the pipes, or repairing or replacing the water heater if it's not functioning correctly. In many cases, it's best to call a professional plumber to diagnose and fix the issue, as they have the expertise and tools to properly identify and resolve the problem.