I do not empty my irons after every use. My Rowenta says to use tap water and so I do. I also use tap water in my Sunbeam. Over the years various irons have required distilled water, or cleaning with vinegar, etc. But, with the self-cleaning irons, I don't have any leaking problems. But, then I use my iron a lot and have to refill several times a day. Best advice is to follow the instructions in the book for your particular iron.