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Bosch Aquastar 250SX Tankless Water Heater Techs & Specs
Bosch AquaStar 250 SX - Applications and Sizing
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BTU Input
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NG: 35,000 to 175,000
LP: 31,000 to 175,000
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Energy Factor
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.80
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Average Efficiency
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87%
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Ignition
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Electronic
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Minimum Flow Rate (gpm)
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0.8
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Capacity (gpm)
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6.4 @ 45°F rise
5.3 @ 55°F rise
4.5 @ 65°F rise
3.9 @ 75°F rise
3.3 @ 90°F rise
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Weight
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47 lbs.
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Dimensions
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23 1/2" h by 15 3/4" w by 8 1/2" d
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Modulating Gas Valve
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Yes
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Optional Accessories
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Wireless Remote Control
Vent Termination Kit
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Life Expectancy
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20+ years
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Model AquaStar Bosch 250SX - Installation Specifications
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Voltage
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120 VAC
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Exhaust Vent Size
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3-inch Stainless Steel Sealed Cat III
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Combustion Air Pipe Size
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3-inch PVC / Alum. / Galv.
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Vent Options
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Horizontal or Vertical, Direct Vent Room Sealed Combustion
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Exhaust Vent Termination
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Horizontal or Vertical
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Min / Max Vent Lengths
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Minimum length: 3 feet
Maximum length: 26 ft. (8m) with one 90 degree elbow.
Less 2.5 ft. for each additional 90 degree elbow (1.25 ft for each 45 degree elbow)
Max 3 90 degree elbows
Please Note: The use of a 90 degree elbow counts as 2 1/2 feet and
a 45 degree elbow counts a 1 1/4 feet toward the minimun vent lenght.
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Gas Connection
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3/4 inch Male NPT
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Water Connections
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3/4 inch Male NPT
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Natural Gas Pressure
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Min: 5" WC
Max: 14" WC
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Propane (LP) Gas Pressure
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Min: 11" WC
Max: 14" WC
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Water Pressure
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Min: 30 PSI
Max: 150 PSI
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What does Direct Vent or Room sealed mean? The 250SX can be installed in a small space
with the ability to take in air from the outside via a 3 inch intake vent.
The Bosch AquaStar 250SX can be vented vertically or horizontally to the
outside. The 250SX requires a dedicated 3" stainless steel single wall
vent pipe. Other vent types will void the warranty and present a health
hazard. The 250SX also requires an electrical connection for the electronic
ignition.
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Model AquaStar Bosch 250SX - High Altitude Operation
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Propane or Natural Gas
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Altitude 0 - 4,000 ft
(0-1,219 m)
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No modification
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Altitude 4,000 ft - 7,000 ft
(1,219m-2,134m)
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CO2 adjustment with flue gas analyzer required
Contact CEC for instructions
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Altitude above 7,000 ft
(2,134m)
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Not approved
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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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