Tankless Water Heaters / Electric / Gas / Bosch Aquastar / 2400ES Water Heater Specs
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AquaStar 2400ES Tankless Hot Water Heater
Technical Information and Specifications

Bosch Water Heater Main Page

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 - 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


Model AquaStar Bosch 2400ES - Installation Specifications
Voltage 120 VAC
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
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


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