Bosch Greentherm C1050 ES NG Natural Gas Tankless Water Heater

The Bosch Greentherm model C 1050 ES has Energy Factor 0.95, and is equipped with an automated and fully modulating bypass for unsurpassed DHW temperature stability. Energy star rated.

  • Improved energy factor of 0.95
  • Inlet water filter featuring easy external access
  • Concentric up-and-out venting for single boilers and two to four unit single pipe cascades
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SKU: B-GT-C-1050-ES-NG Categories: ,

Water Heater Description

Operating on a 199,000 BTU per hour input, this natural gas tankless water heater water boasts a 96% thermal efficiency rate. Best of all, it is suitable for both indoor and outdoor installations and is easily installed on most any platform. Minimum activation flow rate of 0.65 gallons per minute.

Manufacturer SKU: Greentherm C 1050 ES

Manufacturer PDF: 73H995007A-BoschGreenthermGasTankless-L13_US_US_1.pdf

Water Heater Specifications




Natural Gas


Tankless (whole house)

Ignition Type

Direct Spark Ignition

Energy Star


Water Heater Warranty

Waterheaters.com will honor all warranties in accordance with manufacturer policies and procedures. Manufacturer warranty issues should be addresses directly with the manufacturer.

15 year limited warranty on heat exchanger | 3 year warranty if used in uncontrolled recirculation applications | 10 year warranty on heat exchanger if used in controlled recirculation applications, such as by an aquastat | 10 year limited warranty on heat exchanger if used in combination DHW and hydronic forced air heat | 5 year warranty on all other parts | 1 year labor warranty