I do not recommend buying any of the Haan products. Go with the Shark instead. Our house is all tile and hard wood. With 2 kids and 2 dogs we steam frequently. Our water is notoriously hard, so we use distilled water in the tanks AND use the cleaning solution recommended by Haan to make sure the media that moves the water from the tank to the steamer never fills with calcium or other contaminates.
Since 2011, we have gone through 4 HAAN SI-70 Multi Purpose Floor Steamers. Each time, the company tried to blame it on our hard water or improper maintenance. Bull crap. We use as pure of water as you can find AND use the cleaner.
We switched to the Shark brand steam mop and it is WAY better. It puts out more steam, the pads are bigger and scrub better, and you can flip over the pad so you don't have to switch out pads so much. We love it, our maid loves it, and we haven't had any degradation in performance since we've had it, unlike the HAAN ones.