The full line of State Modulating Ultra Force High Efficiency Power Vent condensing water heaters has been designed to provide years of dependable service and feature industry leading technology. Models are available from 120,000 to 500,000 Btu/h and all deliver thermal efficiencies of 95% and higher. The unique helical coil heat exchanger limits weld joints for optimal service life while maximizing heat transfer. Modulating Ultra Force High Efficiency Power Vent is an industry leader in high efficiency commercial water heating. The current modulating models adjust firing rate to the specific demand further increasing efficiency and money savings.