800 ES Series High Output Condensing Tankless Water Heater
Residential Models


Bosch Tankless Water Heater at Just Tankless

The new GWH C 800 ES condensing unit offers a flow rate of up to 9.2 gpm, 92% efficiency, and the most advanced features in tankless technology, yet requires only 199,000 BTU/Hr input. It is designed to cascade for increased flow rates and will accommodate recirculating applications as well.

Efficient Condensing Technology: ProTankless GWH C 800 ES
  • 92% thermal efficiency – .91 energy factor
  • Condensing heat exchanger for maximum efficiency
  • Vents vertically or horizontally with 3" and 4" PVC, CPVC or ABS-DWV
  • Concentric and twin pipe venting options
  • Direct vent, room-sealed combustion
  • Ability to cascade units for increased flow rates
  • Suitable for recirculating applications
  • Outdoor installation using optional kit
  • Available in natural gas (NG) or liquid propane (LP)
  • 15-year warranty