Bosch Therm C 1210 ES – Gas Tankless Water Heater

BTU: 25,000 - 225,000

Household Capacity: 12.1 gallons per minute capacity at 35F degree rise

Product Features:

Therm C 1210 ES
Highest performance, efficiency and flow rate

Product Specifications
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).

Therm C 1210 ES Specifications
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.


Features & Benefits
• 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
• 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