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Bosch 7703311073 Therm C 1210 ES NG 225,000 BTU Input Indoor Condensing Tankless Water Heater (Natural Gas)

SKU kpi041-7703311073
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Product details

SKU: kpi041-7703311073
Manufacturer: Bosch Water Heater
Manufacturer Part Number: 7703311073
Capacity: 225000 BTU
Shipping Weight: 89
Depth: 11.25
Width (inches): 17.875
Height (inches): 30.5

Product description

Bosch Therm C1210ES Tankless Water HeaterThe Bosch Therm C 1210 ES Condensing tankless water heater is the highest performance, fully condensing gas tankless water heater from Bosch. This 225,000 BTU heater is designed for residential applications and can deliver hot water up to 140 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 High Temperature Kit cannot be used with this heater.The Bosch Therm C1210 ES is the direct replacement for the Bosch GWH C 920 ES.


  • 82% thermal efficiency .82 energy factor
  • Direct vent, room-sealed combustion
  • Vents vertically or horizontally with 3" stainless steel (AL29-4C)
  • Ability to cascade units for increased flow rates
  • Outdoor installation using optional kit
  • Suitable for recirculating applications
  • Available in natural gas (NG) or liquid propane (LP)
  • Power Input LP: 199,000 BTU/Hr
  • Maximum Flow to Activate 0.65 gallons per minute (gpm)
  • Modulating Gas Valve Min Firing Rate: 19,900 BTU/Hr
  • Max Firing Rate: 199,000 BTU/Hr

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 - 140
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) <2.5/120
Remote ControlOptional Wireless TSTAT2 Available

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