I have a gas hot water service that moths get into for warmth but they keep putting the pilot light out resulting in cold showers. How to stop this from happening?

An outdoor light should attract them away from the utility closet. Some people have had good results with the electrocution traps but caution that any trap should be set up away from the house.

Simply place a screen around the bottom section of the heater. That should do it. Good luck, Tom