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Bosch 7703311072 Therm C 1210 ESC NG Indoor Commercial Condensing Tankless Water Heater (Natural Gas)

SKU kpi041-7703311072
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Product details

SKU: kpi041-7703311072
Manufacturer: Bosch Water Heater
Manufacturer Part Number: 7703311072
Capacity: 225000 BTU
Shipping Weight: 89
Depth: 11.25
Width (inches): 17.875
Height (inches): 30.5

Product description

Bosch C1210ESC Tankless Water HeaterThe Bosch C 1210 ESC Condensing tankless water heater is the highest performance, fully condensing gas tankless water heater from Bosch. This 225,000 BTU heater is designed for commerical applications and can deliver hot water up to 180 degrees F with a 12.1 GPM flow rate.Unlike traditional non-condensing models, condensing technology captures heat from the exhaust gas and uses it to preheat the incoming cold water.

This increases efficiency and reduces emissions -- well ahead of the 2012 Low NOX emissions standards set by SCAQMD (California -- South Coast Air Quality Management District).This heater features an electronic ignition system and can vent through either 3 inch or 4 inch diameter PVC vent pipe either through the side wall or up through the roof. A concentric venting option is available.This heater comes with built-in freeze protection and a water filter that is externally accessible, but does not come with a PRV.The Bosch Therm C1210 ESC is the direct replacement for the Bosch GWH C 920 ESC.


  • ASME certified
  • Up to 98% thermal efficiency
  • 225,000 BTU maximum input
  • 12.1 gallons per minute capacity at 35F degree rise
  • Cascade up to 24 units to satisfy jobs of all sizes; up to 290 GPM
  • Minimum activation flow rate of 0.5 gallons per minute
  • Electronic ignition and patented burner design
  • Exclusive safety and precision controls
  • Built in freeze protection
  • Direct vent, vertically or horizontally with PVC, CPVC or ABS-DWVConcentric and twin pipe venting options
  • Can be used in tank loading, solar thermal, recirculation, radiant floor and space heating applications
  • Space saving design with 100% serviceable parts and easy access

Additional Information

Gas TypeNatural Gas
Product TypeWhole House
Heater StyleTankless
Condensing UnitYes
Capacity @ 35 Deg F Temp Rise (GPM)12.1
Capacity @ 45 Deg F Temp Rise (GPM)9.2
Capacity @ 55 Deg F Temp Rise (GPM)7.7
Maximum Input (BTUs)225000
Minimum Input (BTUs)25000
Maximum Output (BTUs)210000
Minimum Output (BTUs)23000
Altitude Test (Ft)8000
Temperature Range (Deg F)100 - 180
Venting OptionsPVC, CPVC, ABS, Cat III Stainless Steel
Venting Diameter (Inches)3 or 4
Vent Maximum Run (Ft)63
Gas Connection (Inches)3/4 NPT
Water Connections (Inches)3/4 NPT
Activation Flow Rate (GPM)0.5
Water Pressure Rating (PSI)30 - 150
Thermal Efficiency (%)98
Electrical Requirements (AMPS / V)<
Remote ControlOptional Wireless TSTAT2 Available

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