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Bosch C1210ESNG

Therm C1210ESNG 18" Natural Gas Tankless Water Heater With 225,000 BTU Max Input, Electronic Ignition, Built In Freeze Protection, 150 PSI Max Water Pressure, Condensing, In Grey
★★★★★ ★★★★★

Therm C1210ESNG 18" Natural Gas Tankless Water Heater With 225,000 BTU Max Input, Electronic Ignition, Built In Freeze Protection, 150 PSI Max Water Pressure, Condensing, In Grey

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Items labeled Quick Ship will ship within 2 business days from our East Coast warehouse. Actual delivery times will vary based on your location. If you are ordering multiple items and not all items qualify for Quick Ship, the order will ship when all items are available to ship. Quick Ship may not apply to multiple quantities of the same product.

Quick Specs: View More

  • Width: 17.88"
  • Height: 30.5"
  • Depth: 11.25"

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This is the highest performance, fully condensing gas tankless water heater from Bosch. 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’s South Coast Air Quality Management District). Available at AppliancesConnection


The Bosch Group has been a leading global supplier of technology and services in the areas of Automotive, Industrial Technology, Consumer Goods and Building Technology for over 100 years. The company was founded in Stuttgart, Germany, in 1886 and today has more than 300 subsidiaries in over 150 countries. Every Bosch product is built with one goal in mind; to enhance the quality of your life every day by providing solutions which are both innovative and truly beneficial.


  • Up to 98% thermal efficiency
  • 225,000 BTU maximum input
  • 12.1 gallons per minute capacity at 35F degree rise
  • 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 solar thermal, recirculation, and space heating applications
  • Built for durability and serviceability with 15-year warranty and 20+ year life expectancy
  • Natural Gas Unit


Condensing/Non-Condensing Condensing
Application Residential or Commercial
Max Input (BTU) 225,000
Min Input (BTU) 25,000
Capacity at 35°F Rise (gpm) 12.1
Capacity at 55°F Rise (gpm) 7.7
Intelligent Cascading Up to 24 Units
Min Flow Rate 0.5 GPM
Temp Range (°F) 100-140
Temp Stability (°F) +/- 2
Default Temp (°F) 122
Energy Factor n/a
Thermal Efficiency 94%
Installation Options Indoor or Outdoor (for outdoor, kit required)
Dimensions (w x h x d) 17 7/8" x 30½" x 11¼"
Weight (lbs.) 88
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, Stainless Steel
Vent Maximun Run 63'
Energy Star Rated n/a
For models C 1210 ES/ESC : 35°F capacity is based on installation with a mixing valve to overcome typical pressure loss through the water heater and system. -


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Overall Rating ☆☆☆☆☆ ★★★★★ 4.5
Ease of Use 5.0
Meet Expectations 5.0
Bang for Your Buck 4.5
Average rating out of 2 reviews

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Customer Reviews

 from Lincolnton, GA
Overall Rating: ☆☆☆☆☆ ★★★★★ 5
Ease of Use: 5
Meet Expectations: 5
Bang for Your Buck: 5

Recommended Product:

Great product which does an exceptional job at heating my water. Very durable with great warranty!

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 from Knoxville, TN
Overall Rating: ☆☆☆☆☆ ★★★★★ 4
Ease of Use: 5
Meet Expectations: 5
Bang for Your Buck: 4

Recommended Product:

Great tankless unit with great thermal efficiency. I would recommned this water heater to all my family and friends.

Was this helpful? 👍 0 👎 0

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  • Brand:Bosch
  • SKU:C1210ESNG
  • Stock Id:345303
  • Product Number:C1210ESNG


  • Fuel Type:Natural Gas
  • Tankless:Yes


  • Width:17.88"
  • Depth:11.25"
  • Height:30.5"

    Technical Details

  • Color:Grey
  • Weight:88 lbs
  • Voltage:120 Volts
  • Exterior Width:18"
  • Usage:Residential