Buy elegant and slim water purifiers that come with a 6-stage filtration system and auto-sterilization properties. Cuckoo tankless water purifiers are known for their space-saving design and the ability to deliver 100% instant hot water. These purifiers eliminate 99.99% of the germs, bacteria, mercury, lead, and other harmful contaminants from the water, thus ensuring that you get safe drinking water. The tankless purifiers have a slim design and they look pretty sophisticated. If you have a small space, the cuckoo tankless water purifier is your best bet. Check out the water purifiers from Titan, Prince Top, and Marvel if you are looking for a tankless and slim design.