The answer to 'drain no hot water' is that the most common causes are a malfunctioning water heater, broken thermostat, or sediment buildup in the tank. Symptoms include no hot water coming from the tap and the water heater not heating up. Solutions may involve repairing or replacing the water heater, thermostat, or flushing the tank to remove sediment.
For minor issues, homeowners may be able to troubleshoot and fix the problem themselves. However, for more complex problems or if you are not comfortable working on a water heater, it's best to call a professional plumber to diagnose and repair the issue properly and safely.