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Bosch AquaStar 2400E Tankless Water Heater
Fueled by Natural Gas or Propane - Power-Vented - Electronic Ignition


The Bosch 2400E model number has changed to Bosch 2400ES.

AquaStar 2400E tankless water heater 2400E Gas Water Heater
The Bosch AquaStar Model 2400E 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 Model 2400E is the right choice.

The high performance 2400E sets a standard for tankless water heating by delivering over 5.2 gallons of hot water continuously at 87% efficiency — enough to shower with even while filling the tub or washing machine. Yes, you can run two showers at one time!

The Bosch Aquastar 2400E is a sealed combustion tankless water heater which means that you can pull combustion air from outside or inside. Venting either to an outside wall or up through the roof. The 2400E also can pull air from inside if you can not get to outside air. Yes, this is a very flexible tankless water heater.

Bosch's most powerful offering. Certainly the engineers at Bosch have outdone themselves — the beauty of this unit is in its simplicity. The Bosch Aquastar 2400E requires no special tools to install or maintain. And its compact size and sealed combustion enables installation in small spaces. A built-in power vent makes both vertical or horizontal venting possible while the electronic ignition maximizes energy efficiency. This unit yields enough power to supply two showers simultaneously and features an optional adjustable temperature control for improved comfort.


Bosch AquaStar 2400E Tankless Water Heaters will provide hot water for 2 major uses at one time. AquaStar 2400E water Heaters can provide you with 2 majors uses at once AquaStar 2400E water Heaters can provide you with 2 majors uses at once AquaStar 2400E 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 / 3.7 gpm
    65° F rise / 4.5 gpm
    55° F rise / 5.2 gpm
    45° F rise / 6.4 gpm (Max Flow)
  • Direct Vent Room Sealed Combustion (outside air)
    or pull combustion air from inside spaces
  • BTU Input: 175,000
  • Energy Factor .85
  • Average Efficiency 87% (recovery efficiency)
  • Electronic Ignition
  • Built-In Back Flow Preventer to keep cold out
  • Built-In LCD Temperature adjustment
  • Voltage 120 VAC 50/60 Hz standard plug
  • Exhaust Vent Size 3" (Stainless Steel Seal Pipe only)
  • Combustion Air Pipe Size 3"
  • Activation: .8 gpm
  • Warranty: 12 years on the Heat Exchanger - 2 years on parts - Limited Warranty
  • Dimensions: H 23½" x W 15¾" x D 8½"
  • Weight 47 lbs. (21 kg)
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 2400E and other 3-inch vent machines
Zvent Stainless Steel Venting


How to Recirculate
Domestic Hot Water


Need Outdoor Installation?
Click here for the 2400ES with optional outdoor kit Gas Water Heater



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