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Bosch - Energy Star 83% Tankless Water Heaters

The Bosch 83% tankless water heaters will meet the demands of the busy household and can be installed almost anywhere. Our tankless water heaters offer higher flow rates, sealed combustion, vertical or horizontal venting, and an outdoor installation option.

  • 83% thermal efficiency
  • Direct vent, vertically or horizontally with AL29-4C stainless steel Category III venting
  • Exterior Mount
  • Direct Electronic Ignition no pilot light
  • Suitable for recirculating applications (3-year warranty)
  • Solar application-ready
  • Continuous hot water at up to 9.2 GPM
  • Heavy duty heat exchanger
  • Whole House Water Heating Solution
  • On-Board diagnostics and safety monitoring
  • Only on when you need It, no standby loss!
MODELConfigurationMax
MBtuH
Min
MBtuH
Flow Rate
GPM
UEFTemp.
Range
Dimensions
HxWxD
Weight
Lbs.
Therm 830 ES 175.0 0.0 0.50 83.00 100-140 30.5 x 17.875 x 11.25 67
Therm 660 EF 140.0 0.0 0.50 83.00 100-160 20.5 x 13.8 x 6.7 36
Therm 660 EFO 140.0 0.0 0.50 83.00 100-160 20.5 x 13.8 x 6.7 67
THERM 940 ES 199.0 0.0 0.50 83.00 100-140 30.5 x 17.875 x 11.25 67
THERM 940 ESO 199.0 0.0 0.50 83.00 100-140 30 x 18 x 11 67

Warranty Information

  • Heat Exchanger for 180 months - Residential
  • Heat Exchanger for 60 months - Commercial
  • Heat Exchanger for 24 months - If used in recirculating applications
  • All Parts for 60 months - Residential and Commercial

Available Documents