Sterilight's Platinum HW (hot water) series incorporate the Sterilume-HW (high output, high temperature) UV lamps. The lamps feature an advanced proprietary coating allowing for consistent UV output over the entire life of the lamp, which is one year or 9000 hours. These high output lamps offer a uniform temperature distribution allowing for consistent UV output at critical applications, such as hot water. As Legionella are found in hot water applications, the Platinum HW (hot water) series offer the best disinfection solution as they can handle high temperatures due to the highly advanced engineering of the HW lamps. All Sterilight UV lamps have a full one-year warranty.