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Bosch 7703311076 830 Therm ES NG BTU Indoor Tankless Water Heater Electronic Ignition (Natural Gas)

SKU kpi041-7703311076
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Product details

SKU: kpi041-7703311076
Manufacturer: Bosch Water Heater
Manufacturer Part Number: 7703311076
Capacity: 175000 BTU
Shipping Weight: 80
Depth: 11.25
Width (inches): 17.875
Height (inches): 30.5

Product description

Bosch Therm 830ES NG / ProTL 175N (Natural Gas) Tankless Water HeaterAt 175,000 maximum BTUs the Bosch 830 ES NG (Natural Gas) is our highest capacity non-condensing tankless water heater. The Bosch Therm 830ES-NG was designed to meet the demands of busy households and offers the premium features you expect from Bosch. This model can be installed almost anywhere thanks to its sealed combustion and dual-fan technology.

It features an electronic ignition system and requires either 3 inch or 4 inch diameter stainless steel vent pipe and can be vented either through the side wall or up through the roof.This heater is Energy Star rated.This heater comes with built-in freeze protection and a water filter that is externally accessible, but does not come with a PRV.The Bosch Therm 830ES-NG / ProTL 175N is the direct replacement for the Bosch AquaStar 2400ES-NG and is the closest replacement heater for the Bosch Protankless GWH 635 ES NG and the Bosch AquaStar 2400E NG and the Bosch AquaStar 250SX-NG (the Bosch Therm 830ES-NG / ProTL 175N is 7 inches taller, 2.5 inches wider and 2.75 inches deeper than these older models).


  • 175,000 BTU tankless natural gas water heater at a maximum 11 gallons per minute
  • Up to 98% thermal efficient operation
  • Ultra-low NOx compliant
  • On-demand, continuous, whole-house water heating
  • Up to 180°F water output supported
  • Activation flow rate as low as 0.5 GPM
  • Accurate temperature setting with easy-read digital display
  • Endless hot water at high flow rates
  • Space-saving, lightweight, and compact
  • Simple plug-n-play installation design

Additional Information

Gas TypeNatural Gas
Product TypeWhole House
Heater StyleTankless
Capacity @ 35 Deg F Temp Rise (GPM)8.3
Capacity @ 45 Deg F Temp Rise (GPM)6.3
Capacity @ 55 Deg F Temp Rise (GPM)5.3
Maximum Input (BTUs)175000
Minimum Input (BTUs)19900
Maximum Output (BTUs)147000
Minimum Output (BTUs)18300
Altitude Test (Ft)8000
Temperature Range (Deg F)100 - 140
Venting OptionsCat III Stainless Steel
Venting Diameter (Inches)3 or 4
Vent Maximum Run (Ft)61.25
Gas Connection (Inches)3/4 NPT
Water Connections (Inches)3/4 NPT
Activation Flow Rate (GPM)0.5
Water Pressure Rating (PSI)30 - 150
Energy Factor0.83
Thermal Efficiency (%)82
Electrical Requirements (AMPS / V) <=2.50/120
Remote ControlOptional Wireless TSTAT2 Available

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