Latest Asked Questions

The Bosch AquaStar 2400ES is a gas tankless water heater that is especially applicable for households with 2 major hot water applications running at the same time. The life span of the model is approximately 20 years.
The list below includes other useful features associated with the model:

  • 12 years of warranty on heat exchanger and 5 years on other parts.
  • Dimensions: H 30 1/2" high, W 17 3/4", D 11 1/4".
  • Weight 67 lbs.
  • The model can supply hot water to two major applications, like showers, simultaneously.
  • The model Bosch AquaStar Model 2400ES provides hot water of up to 6.4 gallons per minute at a 45°F temperature rise off of the ground water temperature.
  • It uses electronic ignition (120V plug-in) with water flow acting as an ignition key.
  • Its energy factor is 0.82.
  • Thermal efficiency equates to 82%.
  • Up to 50% off utility costs are saved thanks to modern design.
  • It features direct vent room-sealed combustion.
  • The built-in power vent allows for horizontal or vertical vent termination.
  • Outdoor installation kit is available for approved climates.
  • Bosch AquaStar 2400ES Gas Tankless Water Heaters are available NG and LP models.
  • Optional remote thermostat accessory allowing temperature adjustments at hot water source is available.
  • Its power input is 19,900-175,000 Btu for both NG and LP.
  • The Bosch 2400ES qualifies for a Federal Tax Credit of up to $1,500 (30% of the unit and installation cost).

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Choose What You Want To Calculate



Water Heater Power
 kW
Water Flow (Per Minute)
 Gallons
See Table "Typical Flow Rates"
Incoming Water Temperature
 °F
Output Water Temperature
 °F

Fixture Type Gallons (Liters) Per Minute
Lavatory
0.5 (1.9)
Bathtub
2-4 (7.6-15.2)
Shower
1.5-3 (5.7-11.4)
Kitchen Sink
1-1.5 (3.8-5.7)
Pantry Sink
1.5-2.5 (5.7-9.5)
Laundry Sink
2.5-3 (9.5-11.4)
Dishwasher
1-3 (3.8-11.4)

Activity Gallons (Liters) Using
Clothes washing
32 (121)
Showering
20 (76)
Bathing
20 (76)
Automatic dishwashing
12 (45)
Preparing food
5 (19)
Hand dishwashing
4 (15)
Source : ACEEE

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