Appliance details
2Appliance details
2.1Features
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
•LCD screen to display temperatures, burner operation and error codes
•On/Off button and separate temperature controls for domestic water heating and recirculating water
•Reset button
•Failure codes for diagnostics and repair
•Freeze prevention cycle.
BOSCH is constantly improving its
iproducts, therefore specifications are subject to change without prior notice.
2.2GWH-345/450-ESR Specifications (Technical data)
Approved in US/Canada
Capacity
GWH345 Maximum flow rate: 3.5 GPM (13 l/min) at a 45°F (25°C) rise.
GWH450 Maximum flow rate: 4.5 GPM (17 l/min) at a 45°F (25°C) rise.
Maximum output
GWH345 - 77,900 Btu/h (22.8 kW)
GWH450 - 98,400 Btu/h (28.8 kW)
Maximum input
GWH345 - 95,000 Btu/h (27.8 kW)
GWH450 - 120,000 Btu/h (35.1 kW)
Efficiency in %
GWH345 Combustion efficiency: 82%
GWH450 Combustion efficiency: 81%
Min. Output
GWH345 - 23,900 Btu/h (7 kW)
GWH450 - 35,500 Btu/h (10.4 kW)
Temperature Control
Selection range: 115°F (45°C) - 190°F (90°C)
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
See chapter 3.6 for Venting.
Water
•Hot water connection - ¾” NPT
•Cold water connection - ¾” NPT.
Combustion
•NOx ≤ 100 ppm
•CO ≤ 250 ppm
•CO2 level (see table 8 for correct restrictor 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.
The appliance is not field convertible.
Voltage
120 V AC (50/60 Hz)
Amperage
Idle - 40 mA
Operation - ≤ 1.5 A
Noise
≤50 db (A)
Safety devices
•Flame failure device (Ionization flame control)
•Overheat prevention (temperature limiter)
•Pressure switch (blocked vent protection).
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