I have a Shark Genius steam mop - (scored it with Kohl's cash and a 30% off coupon - I paid $25 for it!) - I haven't it had it too long, have used it about a half dozen times and have been very pleased with it! I use it on the least amount of steam on our hardwoods and highest steam for tile. Like Amie said though, maybe check w/ the floor warranty before using it on your hardwood.
https://www.amazon.com/Shark-Genius-...-garden&sr=1-5