The answer to 'why is my drain no hot water' is that there could be several common causes, such as a faulty water heater, a problem with the plumbing system, or an issue with the water supply. Symptoms may include lukewarm or cold water coming from the tap, a lack of hot water throughout the home, or the water heater not heating up properly.
Some potential solutions include checking the water heater thermostat, flushing the water heater to remove sediment, or inspecting the plumbing pipes for any blockages or leaks. If the issue persists, it's best to call a professional plumber to diagnose and repair the problem, as they have the expertise and tools to properly identify and fix the issue.