Other causes of ectropion are scarring, burns, trauma (called cicatricial ectropion), spasm of the orbicularis muscle, which may affect either the upper or lower eyelid, or paralysis of the orbicularis muscle in which only the lower eyelid is affected.
It is possible that there is nothing wrong with your water heater. There is a pressure relief valve on top that may be releasing water because your primary water pressure reduction valve for the house is worn out. The fact that the leak is intermittent suggests this.
A water pump with a bad seal shaft, a damaged heater core or a bad head gasket are also reasons for a vehicle leaking coolant. These causes are harder to identify and typically require a mechanic to fix. If a vehicle is leaking or low on antifreeze, it should not be driven.