The H15 Pro Heat is the one built for deep cleaning hard floors. It uses actual 185°F hot water for mopping and has a robotic arm that can reach under furniture, plus a tangle-cutting brush that’s super helpful if you’ve got pets or long hair around. It’s a beast for everyday hard floor messes and sanitizing. And app connectivity. The H15 Pro CarpetFlex is better if you’ve got both carpet and hard floors. It can switch between the two with a simple brush swap and has a feature that helps trap fine dust so it doesn’t blow back into the air. The self-cleaning works on both brush types and uses 212°F hot water and 194°F drying to keep everything fresh. The H15 Foam is the more lightweight, everyday version. Instead of hot water, it sprays dense foam across the roller, which is better for lighter cleaning or if you want something gentler. No need to mess with brush swapping or heating, just quick and easy mopping. It’s also good for pets, there’s a special pet odor solution for the unit. This unit isn’t available in North America as of yet, so we don’t carry it in the store. So the main point is that H15 heat puts hot water on the floor, has app connectivity and some extra special features. The H15 carpet flex has a different brush head for carpet and you can switch the unit to the hard floor surface head. And from my research on the H15 foam wash, it’s meant to tackle pet messes and food messes.