Bosch T-9900 160k BTU Residential Indoor Tankless Water Heater

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With its many features for ease and comfort, the Bosch T9900 7736503730 is a good all-around tankless water heater for your home.


  • 9 maximum gallons per minute, 160,000 BTU natural gas tankless water heater
  • Operates at up to a 98% thermal efficiency and is ultra-low NOx compliant
  • Designed for whole-house water heating, on demand and with no interruptions
  • Supports up to a 180°F water output
  • Easy-read digital display for accurate temperature setting
  • Integrated freeze protection and auto-tuning for optimal performance
  • Average life expectancy of up to 20+ years according to the manufacturer
9 Maximum Gallons Per Minute (GPM)

With a maximum heating flow rate of 9 GPM, the Bosch T9900 7736503730 is designed to work in a wide variety of applications. For an example of what some common applications may use in terms of gallons per minute, see below:

  • Kitchen Faucet: 2-3 GPM
  • Shower: 1.5-3 GPM
  • Dishwasher: 2-4 GPM
  • Washing Machine: 3-5 GPM

Bosch offers a 5-year part replacement warranty and a 1-year reasonable labor warranty that covers all components incorporated in the water heater itself at the time of manufacture. All Bosch accessories carry a 1-year parts warranty when installed in the field. On top of these, Bosch offers a 15-year limited lifetime heat exchanger warranty on residential applications. For more information on this unit’s warranty and to register your unit, click here.

Product Specifications
More Information
Bosch T-9900 160k BTU Residential Indoor Tankless Water Heater
Weight (in lbs) 78.700000
Exhaust Flue Requirement Plastic / PVC
Manufacturer Bosch
Additional Information Integrated Pump For Hot Water Recirculation
Additional Information Connection size: 3/4" NPT
Additional Information Water pressure: 18-150 PSI
Furnace Efficiency / AFUE 98%
Exhaust Pipe 3" primary 2" secondary
Venting Type Vented
Energy Star Yes
Electrical 120V AC, 60Hz
Ignition Type Electronic ignition
Fuel Type Natural Gas, Gas
Height 31.5"
Width 18.5"
Depth 9.75"
Warranty 15 Years Heat Exchanger, 5 Year Parts, 1 Year Reasonable Labor
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Safety Information PROPOSITION 65 WARNING
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