The answer to 'water line no hot water' is that the most common causes are a faulty water heater, a problem with the hot water supply line, or an issue with the home's plumbing system. Symptoms may include no hot water at all, lukewarm water, or inconsistent hot water. Solutions can range from simple DIY fixes like checking the water heater thermostat or flushing the system, to more complex repairs that require a professional plumber.
If the issue is with the water heater, it may need to be repaired or replaced. Problems with the hot water supply line could be due to a blockage, leak, or other damage that needs to be addressed. In some cases, the issue may be with the home's plumbing system, such as a problem with the valves or pipes that distribute hot water throughout the home.