Bosch 2700ES NG Aquastar 7.2 GPM Indoor Tankless Natural Gas Water Heater

Bosch 2700ES NG Aquastar 7.2 GPM Indoor Tankless Natural Gas Water Heater Bosch 2700ES NG Aquastar 7.2 GPM Indoor Tankless Natural Gas Water Heater
List Price: $1,475.00
Sale Price: $1,070.00

Natural gas tankless water heater with electronic ignition delivers over 7 GPM at (45 F.) enough to run up to 3 major applications (showers) at 1 time. Built in power vent allows for vertical or horizontal vent termination up to 26'. Exhaust vent size: 3"

How Does a Natural gas water heater Work ?