I'm trying to take a proactive approach here for possible water heater leaks and am looking for a bit of guidance. I currently have a 30 gallon low boy type water heater sitting in a plastic drip pan which leads no where. It's on an outside wall and I was hoping to pipe the drain directly outside where I would quickly notice any potential leaks. My only concern would be critters crawling pack through the pipe and into my house. Would putting a check valve on the line keep any intruders out or is there a better solution here? Thanks!