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.
The most obvious signs that a water heater may be leaking CO comes not from the heater but from people in the house. Headache, dizziness, weakness and upset stomach are the most common signs of CO poisoning. Vomiting and chest pain, even confusion, also can occur, according to the Centers for Disease Control.