Quick view NORITZ NORITZ Indoor Non-Condensing (Single Vent) 9.8 GPM 199,900 BTU Liquid Propane Gas Commercial Tankless Water Heater The NC1991 199,900 BTU Propane Tankless Water Heater has a maximum of 9.8 GPM with optional multi-sy MSRP: Was: Now: $0.00 Call for Pricing