The article discusses the possibility of using a water heater that does not require electricity to heat a large tank, such as a 100-gallon trough. -The fire was caused by an electric trough heater that was not correctly grounded and did not have a cage around it to prevent the heating element from contacting the trough. -The horse owner had previously used the same heater in a galvanized tank without incident. -Several other people have also experienced similar incidents. -The article provides safety precautions for using electric trough heaters, such as keeping cords away from horses, using suitable extension cables, using GFCI outlets, using a dedicated trough heater designed for the type of trough, and ensuring correct grounding to prevent the horse from being shocked or electrocuted.