Leakage is one of the frequently encountered issues with the ball valve on a water heater. This can occur at the connection points or around the valve body itself. For example, if the seals around the ball valve on a water heater are worn out, water can seep through. Another reason for leakage could be improper installation. If the ball valve on a water heater is not tightened correctly during installation, it may start to leak over time. To diagnose a leakage in the ball valve on a water heater, a visual inspection is the initial step. Look for any signs of water droplets or dampness around the valve. You can also check the water pressure. If the water pressure is too high, it may put excessive stress on the ball valve on a water heater and cause it to leak. To repair a leaking ball valve on a water heater, if it is due to a worn-out seal, replacing the seal is often the solution. Tightening the valve connections properly can also stop the leakage if it is caused by loose installation.