The answer to 'water heater overflowing' is that the most common causes are a faulty pressure relief valve, sediment buildup, or a problem with the tank itself. Symptoms include water leaking from the tank or pressure relief valve, and the tank making strange noises. Solutions may involve replacing the pressure relief valve, flushing the tank to remove sediment, or in some cases, replacing the entire water heater.
It's important to address a water heater overflow promptly, as it can lead to water damage and other issues. In many cases, a DIY fix may be possible, but for more complex problems or if you're uncomfortable working with plumbing, it's best to call a professional plumber to diagnose and fix the issue.