Tankless Water Heater C 1050 ES

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Tankless Water Heater C 1050 ES

Tankless Water Heater C 1050 ES

The C 1050 ES model is 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.

Therm C 1050 ES Specifications:

  • Condensing
  • Residential or Commercial Application
  • 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
  • Min Flow Rate 0.50 gpm
  • Temp Range (°F) 100 - 140
  • Temp Stability (°F) +/- 2
  • Default Temp (°F) 120
  • Energy Factor .91
  • Thermal Efficiency 92%
  • Installation - Indoor
  • Dimensions (w x h x d) 17.875" x 30½" x 11¼"
  • Weight (lbs.) 74
  • Inlet Connection ¾" NPT
  • Outlet Connection ¾" NPT
  • Gas Connection ¾" NPT
  • Max Water Pressure 150 psi
  • Min Water Pressure 30 psi
  • Min NG Presure 3.5" WC
  • Condensing Heat Exchanger - Aluminum
  • Venting Options PVC, CPVC, ABS, Cat III, Stainless Steel
  • Vent Maximun Run 63'
  • Energy Star Rated

Features & Benefits:

  • Suitable for indoor and outdoor installations
  • 92%+ thermal efficiency
  • 199,000 BTU maximum input
  • 10.5 gallons per minute capacity at 35F degree rise
  • Minimum activation flow rate of 0.65 gallons per minute
  • Electronic ignition
  • Patented burner design
  • Exclusive safety and precision controls
  • Direct vent, vertically or horizontally with Stainless Steel, PVC, CPVC or ABS-DWV
  • Concentric and twin pipe venting options
  • Can be used in solar thermal, recirculation applications
  • Built for durability and serviceability with 15-year warranty and 20+ year life expectancy
  • Available in NG and LP models


  • 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
  • 5 year warranty on all other parts


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