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Bosch AquaStar 2400ES Tankless Hot Water Heater
Technical Information and Specifications

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Bosch AquaStar 2400ES - Applications and Sizing
BTU Input NG: 19,900 to 175,000
LP: 19,900 to 175,000
Energy Factor .82
Thermal Efficiency 82%
Ignition Electronic (120V plugs in)
Minimum Flow Rate to Activate 0.65 GPM
Flow Rates (gpm) 6.4 @ 45°F rise
5.3 @ 55°F rise
4.6 @ 65°F rise
3.8 @ 77°F rise
3.2 @ 90°F rise
Weight 67 lbs.
Dimensions 30 1/2" H by 17.875" W by 11 1/4" D
Modulationg Gas Valve Yes
Optional Accessories Outdoor Kit (AQOK)
Remote Thermostat (TSTAT2)
Life Expectancy 20+ years


AquaStar Bosch 2400ES - General Installation Specifications
Voltage 120 VAC
Vent Options Horizontal or Vertical or Outdoor with AOKO Outdoor Kit
Gas Connection 3/4 inch Male NPT
Water Connections 3/4 inch Male NPT
Natural Gas Pressure Min: 4" WC
Max: 14" WC
Propane (LP) Gas Pressure Min: 9" WC
Max: 14" WC
Water Pressure Min: 30 PSI
Max: 150 PSI


AquaStar Bosch 2400ES - Indoor Installation Specifications
Exhaust Vent Size 3-inch Stainless Steel
Combustion Air Pipe Size 3-inch PVC / Alum. / Galv.
Vent Options Horizontal or Vertical
Vent Termination Horizontal or Vertical


AquaStar Bosch 2400ES - Outdoor Installation Specifications
The Bosch 2400ES cannot be install outside without the optional Outdoor Installation Kit Model AQOK.
Outdoor Installation approved for climates only where potential freezing conditions are infrequent and not severe.


AquaStar Bosch 2400ES - High Altitude Operation
Propane or Natural Gas Models
Altitude 0 - 2,000 ft
(0-610 m)
No modification
Altitude 2,000 ft - 4,500 ft
(610m-1,372m)
CO2 adjustment with flue gas analyzer required Contact CEC for instructions
Altitude above 4,500 ft
(1,372m)
Not approved
For operation at elevations above 2,000 ft (610 m) the equipment ratings shall be reduced at the rate of 4% for each 1000 feet (305m) above sea level.


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