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Bosch 2400ES Tankless Water Heater
Fueled by Natural Gas or Propane - Electronic Ignition - 2 Use Machine


The Bosch 2400ES replaces the Bosch 2400E
Tankless Water Heater Bosch 2400ES Tankless Water Heater Bosch 2400ES
The Bosch 2400ES has quickly become the tankless water heater of choice for families needing to operate two major hot water applications at a time. With an average life expectancy of more than 20 years, energy savings of up to 50%, and an endless supply of hot water, your family will thank you for years to come. Easy to install with multiple venting options, the Bosch AquaStar 2400ES is the right choice.

The high performance 2400ES sets a standard for tankless water heating by delivering over 5.2 gallons of hot water continuously at 82% efficiency — enough to shower with even while filling the tub or washing machine. Yes, you can run two showers at one time!

Please Note: Bosch no longer includes a vertical drain pipe or condensation drain tube kit with this unit. You must check the manual to see if these parts are necessary for your installation, in many cases, they will be. These items can be purchased at Zvent Z Flex 3-Inch Sealed Stainless Vent Pipe.

Bosch AquaStar 2400ES Tankless Hot Water Heaters will provide hot water for 2 major uses at one time. Bosch 2400ES Tankless Water Heaters can provide you with 2 majors uses at once Bosch 2400ES Tankless Hot Water Heaters can provide you with 2 majors uses at once Bosch 2400ES Tankless Hot Water Heaters can provide you with 2 majors uses at once
  • Temperature Increase / Gallons per Minute Relationship:
  • 90° F rise / 3.2 gpm
    77° F rise / 3.8 gpm
    65° F rise / 4.6 gpm
    55° F rise / 5.3 gpm
    45° F rise / 6.4 gpm (Max Flow)
  • Direct vent room sealed combustion
  • Delivers over 6 gallons per minute, enough to run 2 major applications at once
  • Built-in power vent allows for vertical or horizontal vent termination
  • Provides endless supply of hot water
  • Saves up to 50% of utility costs
  • Space saving size and weighs only 67 pounds
  • BTU Input: 175,000
  • Electronic Ignition - 120V plug-in (no standing pilot)
  • Outdoor installation kit (AQOK) available for approved climates
  • Wireless Remote (TSTAT2) available for quick and easy temperature control
  • 12 year warranty on the Heat Exchanger - 2 years on parts
Please Note:
For Massachusetts Residents' considering purchasing and installing the 2400E - please read this document:
Sidewall Venting Information for Commonwealth of Massachusetts.
See the Bosch AquaStar 2400ES prices, choose gas type, accessories and more on next page

Zvent Stainless Steel Venting for the Bosch 2400ES and other 3-inch vent machines
Z Vent Stainless Steel Venting


2400ES Tech & Specs

2400ES Warranty

How to Recirculate
Domestic Hot Water


Need Outdoor Installation?
Click here for the 2400EO Gas Water Heater



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