Rheem RTG-64XLN 6.4 GPM Low NOx Outdoor Tankless Natural Gas Water heater
Rheem RTG-64 DVLN prestige Nox Indoor Direct Vent Condensing
Rheem RTG-64XLP 6.4 GPM Low NOx Outdoor Propane
Rinnai V65IN 6.6 GPM Indoor Low NOx Tankless Natural Gas Water Heater
Rinnai V65EN 6.6 GPM Outdoor Low NOx Tankless Natural Gas
Noritz NR71-SV NG Indoor/Outdoor Tankless Natural Gas Water Heater 6.3 GPM
Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas 6.6 GPM