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Bosch Gas Tankless Water Heaters Therm 800 ES
A Condensing Gas Tankless Water Heater for large sized residential applications
Bosch Therm 800 ES Gas tankless water heaters Bosch Therm 800 ES
The Bosch GWH C 800 ES model is another top performing, fully condensing gas tankless water heater from Bosch. This model offers high flow rates, efficiency and the most advanced features in tankless technology, yet requires only 199,000 BTU/Hr input.

This Bosch Therm 800 ES Gas Tankless Water Heaters is only sold to Licensed Installers.

For Licensed Installers - click here to purchase the Bosch Therm 800 ES

For Retail Bosch Tankless Water Heater - Click Here!



Bosch 800 ES Specifications:
  • Type - Condensing
  • Application - Residential or Commercial
  • Max Input (BTU) - 199,000
  • Min Input (BTU) - 19,900
  • Capacity at 35 (°F) Rise (gpm) - 10.5
  • Capacity at 55(°F) Rise (gpm) - 6.7
  • Intelligent Cascading - No
  • Min Flow Rate - 0.65 gpm
  • Temp Range (°F) - 100 to 140
  • Temp Stability (°F) - +/- 2 °
  • Default Temp (°F) - 122
  • Energy Factor - 91%+
  • Thermal Efficiency - 93%+
  • Installation Options - Indoor
  • Dimensions (w x h x d) - 17 7/8" x 31 1/2" x 11 1/4"
  • Weight (lbs.) - 74
  • Inlet Connection - ¾" NPT
  • Outlet Connection - ¾" NPT
  • Gas Connection - ¾" NPT
  • Max Water Pressure - 150 psi
  • Min Water Pressure - 13 psi
  • Min NG Presure - 3.5" WC
  • Venting Options - PVC, CPVC, ABS, Stainless Steel
  • Energy Star Rated - Yes


Bosch 800 ES Features:
  • Suitable for indoor and outdoor installations
  • 82%+ thermal efficiency
  • 199,000 BTU maximum input
  • 10.5 gallons per minute capacity at 35F degree rise
  • Electronic ignition
  • Direct vent, vertically or horizontally with Stainless Steel, PVC, CPVC or ABS-DWV
  • Concentric and twin pipe venting options
  • Minimum activation flow rate of 0.65 gallons per minute
  • 15 year limited warranty on heat exchanger; 3 year warranty if used in direct recirculating applications
  • 15 year warranty on heat exchanger if used if recirculated through a storage tank such as the Ariston mini-tank
  • Warranty 5 years on all other parts
  • Available in NG and LP models


View all Bosch Manufactured Products here

See Bosch 800 ES Models - click here

Bosch 800 ES PDF Manuals
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