Bosch Therm C 1210 ESC NG Tankless Gas Water Heater, Commercial Indoor Condensing, 225,000 BTU Max, 12.1 GPM

SKU: 826543
Brand: Bosch Model: Therm C 1210 ESC NG Condition: New
4 (1 Review)

Bosch Therm C 1210 ESC NG Gas Tankless Water Heater

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The Bosch C 1210 ESC NG Commercial Gas Tankless Water Heater is an indoor, fully condensing, high performing, commercial 225,000 BTU gas tankless water heater. Capable of 12.1 gallons per minute, this condensing tankless water heater captures exhaust gas heat to preheat cold incoming water. Whereas traditional non-condensing models do not, this tankless water latest technology reduces emissions and increases efficiency, far beyond the scope of the emissions standards for 2012 Low NOX. This Bosch commercial tankless water heater has a maximum temperature of 180 degrees.

Designed as a space saver with easy access and serviceable parts, Bosch Therm C 1210 ESC NG gas tankless water heater can be used in solar thermal, recirculation, tank loading, radiant floor and space heating residential applications. This Bosch gas tankless Water heater comes equipped with a wall hanging bracket, an adaptor for the exhaust vent and an inlet adaptor for combustion air. And, with electronic ignition and a patented burner design, the water heater has plenty of amenities.

Although perfect for your home, this Bosch Therm C 1210 ESC NG Tankless Water Heater is not designed or approved for boats, mobile homes or other mobile applications.


  • ASME certified
  • Up to 98% thermal efficiency
  • 225,000 BTU maximum input
  • 12.1 gallons per minute capacity at 35F° 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-DWV
  • Concentric 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


  • Application: Commercial
  • Capacity at 35°F Rise (gpm): 12.1
  • Capacity at 55°F Rise (gpm): 7.7
  • Condensing
  • Condensing Heat Exchanger: Aluminum
  • Default Temp (°F): 122
  • Dimensions (w x h x d): 18' x 30" x 11"
  • Energy Factor: n/a
  • Gas Connection: 3/4" NPT
  • Max Water Pressure: 150 psi
  • Installation Options: Indoor or Outdoor
  • Intelligent Cascading: Up to 24 Units
  • Max Input (BTU): 225,000
  • Min Input (BTU): 25,000
  • Min Flow Rate: 0.5 gpm
  • Min NG Pressure: 3.5" WC
  • Min Water Pressure: 30 psi
  • Outlet Connection: 3/4" NPT
  • Temp Range (°F): 100-180
  • Temp Stability (°F): +/-2
  • Thermal Efficiency: 94%
  • Vent Maximum Run: 63'
  • Energy Star Rated: No
  • Venting Options: PVC, CPVC, ABS, Stainless Steel
  • Weight (lbs.): 88
  • Inlet Connection: 3/4" NPT

Customer Reviews

Bosch water heater

Since there was a $780 difference between getting this Bosch water heater online vs. purchasing it from my local shop, I decided to get it here although I confess that I was a bit nervous. However, the unit arrived intact and it's been two months since we installed it. It performs great provides a reliable supply of hot water.


on 07-10-2014 by John

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Questions & Answers

What is the difference between the Bosch Therm C 1210 ESC NG and the Bosch Therm C 1210 ES NG?

by Michael L. on 03-04-2014

The Bosch Therm C 1210 ESC NG Tankless Water Heater is rated for commercial use while the Bosch Therm C 1210 ES NG Tankless Water Heater is only for residential use.

on 03-07-2014
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