Bosch Greentherm T9900 SE 199,000 BTU Propane Tankless Water Heater - Tankless America
Bosch Greentherm T9900 SE 199,000 BTU Propane Tankless Water Heater - Tankless America

Bosch Greentherm T9900 SE 199,000 BTU Propane Tankless Water Heater

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Bosch Greentherm T9900 SE 199,000 BTU with built-in a recirculation pump provides you with endless, on-demand hot water for your home or business. This natural gas tankless hot water heater is designed for homes that have more demand on a daily basis. Created with Bosch's quality engineering and manufacturing, this unit is designed to run for up to 15 years if properly maintained.  Typically, all hot water heaters we offer can be on the way to you within 1-2 business days.

Why Choose Bosch? 

Bosch Greentherm is unique because all plumbing connections are made from the top of the unit. This saves you on labor and material cost since it takes less time and materials to transition from a tanked water heater to new tankless water heater. A quality system plus an easy install is what keeps Bosch at the top of rankings. 

General Information

  • Unit Type: Water Heater
  • Product Line: T9900
  • Unit Size: 199,000 BTU/H
  • Energy Source: Liquified Propane
  • Wifi Enabled: No (Add Wifi Kit)
  • Recirculation Pump Included: Yes
  • Isolation Valves Included: No (Add Isolation Valves)
  • Propane Conversion Kit: No (Add Propane Conversion Kit)

Product Details

  • Space-saving, state-of-the-art tankless design
  • Ultra-efficient with UEF ratings up to 0.96
  • High-resolution color LCD interface
  • Wi-Fi accessory & App increases functionality
  • Ability to control external pumps
  • Industry-leading 22:1 turn down ratio
  • 60ft venting using 2" pipe
  • Ultra-Low NOx Certified
  • Integrated freeze protection
  • Stainless Steel condensing heat exchanger

Installation Dimensions

  • 18 19/32" W x 31.5" H x 9 27/32" D
  • Weight: 77.2 lbs
  • Indoor hung
  • 2" exhaust & intake

Warranty Information

  • Standard Recirculation: 1-year labor, 5-year parts, 15-year heat exchangers
  • Uncontrolled Recirculation: 1-year labor, 3-year parts, 5-year heat exchangers
  • DISCLAIMER: Unit must be installed by Bosch ABC Contractor or a Licensed Plumber
  • Bosch requires a Licensed Plumber to call technical support in a breakdown emergency. 


  • Energy Star: Yes
  • UEF: 0.96
  • Efficiency: 99%
  • AHRI Certified: Yes

 Technical Specifications:

Flow Rate Unit T9900 SE 160
Maximum flow rate at a 35 °F (19.4 °C) rise GPM (l/min) 11.2 (42.4)
Maximum flow rate at a 45 °F (25 °C) rise GPM (l/min) 8.7 (32.9)
Maximum flow rate at a 55 °F (30.6 °C) rise GPM (l/min) 7.2 (27.5)
Maximum flow rate at a 75 °F (41.7 °C) rise GPM (l/min) 5.2 (19.7)
Maximum flow rate at a 90 °F (50 °C) rise GPM (l/min) 4.4 (16.6)
Maximum gas input¹ BTU/hr (kW) 199,000 (58.3)
Minimum input² BTU/hr (kW) 9,000 (2.6)
Maximum output BTU/hr (kW) 197,010 (57.7)
Thermal efficiency (Efficiency in %) % > 99%