The answer to 'why is my water heater leaking water' is that there are several common causes, including a faulty temperature and pressure (T&P) relief valve, a cracked tank, or sediment buildup. Leaks can also occur at the inlet and outlet connections or around the tank itself.
Symptoms of a leaking water heater include water pooling around the base, rust or corrosion on the tank, and reduced hot water supply. If the leak is coming from the T&P valve, it may be a sign of high pressure buildup in the tank, which can be dangerous. Sediment buildup can also lead to banging or rumbling noises from the tank.