The answer to 'water heater overflowing' is that a water heater overflowing is typically caused by a pressure buildup or a faulty temperature and pressure (T&P) relief valve. Symptoms include water leaking from the top of the water heater or the T&P valve, and the water heater tank may be making strange noises. This issue requires prompt attention to prevent water damage and potential safety hazards.
The most common causes are a blocked or malfunctioning T&P valve, a faulty thermostat, or a problem with the water heater's internal pressure relief system. In some cases, the water heater may simply be too small for the household's hot water needs, leading to frequent pressure buildup and overflow.