Noritz expands its ecoTough Series of gas-fired residential condensing tankless water heaters with the NRC83, an Energy Star-rated unit designed for smaller homes and multifamily dwellings. Available in both indoor (two-pipe, direct-vent NRC83-DV) and outdoor (NRC83-OD) models, the new units have flow rates from 0.5 gpm to 8.3 gpm and temperature settings from 100°F to 140°. Installers can vent the indoor models with 3” or 4” Schedule 40 and 80 PVC or CPVC pipe.