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Appliance Details - Bosch Pro Tankless GWH-450-ES Series Manual

Temperature modulated with electronic ignition - normal duty suitable for recirculating potable water only
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Appliance details

2
Appliance details
2.1
Features
Parts
• Sealed combustion burner.
Safety
• Ionization flame sensor
• Over temperature protection.
High quality materials for long working life
• Copper heat exchanger
• Compact space saver: mounts on a wall with
supplied bracket.
Features
• LED to display temperatures, burner operation and
diagnostic error codes.
• On/Off button and separate temperature controls for
domestic and heating
• Reset button
• Failure code for diagnostics and repair
• Freeze prevention cycle.
Accessories
• Horizontal vent kit
• Pump manifold
• 12 kOhm DHW thermistor.
BOSCH is constantly improving its
i
products, therefore specifications are
subject to change without prior notice.
2.2
GWH-450-ES Specifications
(Technical data)
Approved in US/Canada
Capacity
GWH450 Maximum flow rate: 4.5 GPM (17 l/min) at a
45°F (25°C) rise.
Maximum output
GWH450 - 98,400 Btu/h (28.8 kW)
Maximum input
GWH450 - 120,000 Btu/h (35.1 kW)
Efficiency in %
Recovery efficiency 82%
Min. Output
GWH450 - 34,200 Btu/h (10 kW)
Temperature Control
Selection range: 100°F (40°C) - 140°F (60°C)
4
Gas Requirement
Gas connection (inches) - ¾"
Inlet gas pressure under operation (with a high hot
water flow rate)*
• Propane: 11" - 14" water column
• Natural Gas: 5.5" - 8" water column.
* To measure Gas Pressure, see Measuring Gas
Pressure, chapter 3.8.
Venting
3" AL 29-4C Stainless Steel exhaust.
See chapter 3.6 for Venting.
Water
• Hot water connection (inches) - ¾"
• Cold water connection (inches) - ¾"
• Connections:
– Bottom of heater
Combustion
• NOx ≤ 55 ppm
• CO ≤ 250 ppm
• CO
level (see table 4 for correct restrictor
2
dimension).
Dimensions
• Depth (in): 11 ¾" (300 mm)
• Width (in): 15 ¾" (400 mm)
• Height (in): 27 ½" (700 mm)
• Weight: 47 pounds (21 kg).
Gas types
Natural Gas.
Liquid Propane.
Converting the gas type can only be done by a certified
gas technician. Call Bosch Water Heating for
conversion information.
Voltage
120 V AC (50/60 Hz)
Amperage
IDLE - 40 mA
Operation - ≤ 1,5 A
Noise
≤ 50 db (A)
Safety devices
• Flame failure device (Ionisation flame control)
• Over heat prevention (temperature limiter)
• Pressure switch (exaust protective
faulty).
6 720 607 915

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