The Hilltake Roto Tanks are manufactured under state-of-the-art technology and designed to give you the most convenient and hygienic solution to the problem of drinking water storage. Roto tanks are the ever so friendly tanks you see every day everywhere in your daily life, rather it be the roof your house or your workplace. Roto tanks are the major product of our company that has made way to almost every Nepali’s homes and hearts. Advantages of Hilltake water tanks The first water tank storage system to obtain NS Certification.