Upgrade your building’s operations. The Hubbell Prime NX Plus is high-efficiency condensing gas water heater ideal for retrofits. It operates at up to 99.9% efficiency with inputs from 1250 to 4000 MBTU. Includes an stainless steel heat exchanger and an optimized burner which meet the requirements of the ASME Boiler and Pressure Vessel Code. Fully integrated digital control system for monitoring critical operating parameters. Compact design and packaged in an outdoor-rated enclosure.