Bosch 520-HN-N - Technical Specifications

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Appliance details
3
2 Appliance details
2.1 520 HN specifications (Technical
data)
Approved in US/Canada
Capacity
520 HN: 4.36 GPM
Minimum input
520 HN: 30,735 Btu/hr
Maximum input
520 HN: 117 000 Btu/hr
Min. Output
520 HN: 23 906 Btu/hr
Maximum output
520 HN: 91 525 Btu/hr
Efficiency in %
Efficiency 80%
Gas Requirement
Gas connection - ¾” NPT
Inlet gas pressure under maximum operation:*
• Propane: 10.5” - 14” water column
• Natural Gas: 5.7” - 14” water column.
* To measure Gas Pressure, see Measuring Gas
Pressure, chapter 3.7.
Venting
• Natural Draft
• Vent diameter - 5" or 6"
• Minimum height (feet) - 6’ with no elbows
• Vertical termination through roof or into chimney.
• Sidewall termination only with AQ4 power vent kit.
Water
• Hot water connection - ½” NPT
• Cold water connection - ½” NPT
• Water valve material: Fiberglass reinforced polymide
(PA)
• Minimum water flow to activate heater: 0.5 gallon/
minute (1.9 l/m)
• Minimum recommended water pressure: 30 PSI
(2.07 bar)
• Connections:
– Bottom of heater
• Temperature rises:
1)
– 45F rise @ 4.1 gpm
– 50F rise @ 3.7 gpm
– 55F rise @ 3.4 gpm
– 65F rise @ 2.8 gpm
– 77F rise @ 2.4 gpm
– 90F rise @ 2.0 gpm
Dimensions
• Depth (in): 8.66” (220 mm)
• Width (in): 16.73” (425 mm)
• Height (in): 25.75” (655 mm)
• Weight: 35 pounds (16 kg).
Gas types
Natural Gas
LP Gas
Safety devices
• Flame failure device (ionization flame rod)
• Pressure relief valve (Available as accessory)
• Overheat prevention (temperature limiter).
Water protection
IP X4.
Accessories (Bosch part #)
• Freeze prevention kit (7709003775)
2)
• Pressure relief valve (FWL-2).
1) Depending on gas pressure and altitude.
2) The freeze prevention kit is designed to provide protec-
tion for the water heater down to approximately 5°F for
short term conditions only. It will not protect the appli-
ance in areas where the temperature is routinely
expected to be below freezing.
- The freeze prevention kit will not protect plumbing out-
side the appliance from freezing. Precautions should be
taken.