Originally Posted by randydevinney (Post 8067086)

Air can not get sucked into a pressurized system. If an electric water heater is spurting air and there is none in your cold water, the cause is ALWAYS a burned out element. The insulation breaks down and the element makes contact with the water. Current then flows from the element through the water. This heats water just like in a steam humidifier but generates a lot of gas. If you have the skill to safely test the element with a multimeter you will see. It is almost always the lower element.