The answer to 'why is my pipe no hot water' is that there could be several common causes, such as a malfunctioning water heater, a problem with the home's plumbing system, or even an issue with the home's electrical or gas supply. Symptoms may include lukewarm or cold water coming from the taps, and the issue may affect just one fixture or the entire home.
Some possible solutions include checking the water heater's thermostat and heating element, inspecting for any leaks or blockages in the plumbing system, and ensuring that the power or gas supply to the water heater is working properly. In some cases, the issue may require the expertise of a professional plumber, especially if it involves more complex repairs or replacements.