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Bosch AquaStar 250SX Tankless Hot Water Heater
Fueled by Natural Gas or Propane - Power-Vented - Electronic Ignition


The Bosch 250SX model number has changed to Bosch 2400ES.

AquaStar 250SX tankless water heater 250SX Gas Water Heater
Bosch AquaStar 250SX Tankless Hot Water Heaters is designed for a wide variety of residential, commercial and on-demand water heating applications. The AquaStar 250SX Gas Tankless Water Heater is very efficient and sized for those houses where space is a premium as well as a large supply of hot water needed.

The high performance 250SX sets a standard for tankless water heating by delivering over 5.3 gallons of hot water continuously at 87% efficiency — enough to shower with even while filling the tub or washing machine. Yes, you can even run two showers at one time!

The Bosch Aquastar 250 SX 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 250SX 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 250SX 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 and horizontal venting possible while the electronic ignition maximizes energy efficiency. This unit yields enough power to supply two showers simultaneously and features an adjustable temperature control for improved comfort.


Bosch AquaStar 250 SX Tankless Water Heaters will provide hot water for 2 major uses at one time. AquaStar 250SX water Heaters can provide you with 2 majors uses at once AquaStar 250SX water Heaters can provide you with 2 majors uses at once AquaStar 250SX water Heaters can provide you with 2 majors uses at once
  • Temperature Increase / Gallons per Minute Relationship:
  • 90° F rise / 3.1 gpm
    80° F rise / 3.5 gpm
    70° F rise / 4.0 gpm
    60° F rise / 4.7 gpm
    55° F rise / 5.3 gpm
    50° F rise / 5.7 gpm
    45° F rise / 6.35 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)
  • Ignition Electronic
  • 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 250SX - please read this document:
Sidewall Venting Information for Commonwealth of Massachusetts.

See the Bosch AquaStar 250 SX Prices, choose gas type, accessories and more on next page

Zvent Stainless Steel Venting for the Bosch 250 SX 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



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