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Bosch Condensing C21 Continuous Flow Gas Hot Water System

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  • Same day shipping for stocked items
  • Money back guarantee
  • Outstanding service & expert technical advice
  • AU owned & operated for 50 years

Quick Overview

Bosch C21 condensing models capture heat from the exhaust gas in a second heat exchanger and use it to preheat the incoming cold water (see images).  This makes it one of the most energy efficient gas hot water systems on the market.

Features and Benefits

  • The C21 offers 6.9 star efficiency*
  • 12% more efficient than the non-condensing eqivalent
  • 21 L/min @ 25°C rise in temperature
  • Continuous flow comfort and performance - never run out of hot water
  • Suits 1-2 bathroom homes
  • Install up to 4 optional temperature controllers
    • Premium main controller (must install first)
    • Then your choice of bathroom controllers or sub controller
  • Compact, lightweight design
  • Great payback period against standard continuous flow product
  • Available in Natural or LP Gas
  • 50°C locked models available
  • Warranty
    • 3 years - Parts and Labour
    • 10 years - Heat Exchanger (part only)

*Equivalent to 6.9 on the 6 star energy rating scale

Star Rating
Bosch Condensing C21 Continuous Flow Gas Hot Water System

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 Bosch Condensing C21
Part Number 55˚C NG BC2180RANG
Part Number 55˚C LPG BC2180RALP
Part Number 50˚C Locked NG BC2180RA5NG
Part Number 50˚C Locked LPG BC2180RA5LP
Energy Star Rating 6.9
Operating Pressure 200 - 1000 kPa
Installation External
Ignition Electric
Minimum Flow Rate (at 20˚C Inlet Temperature) 2.5 L/min
Dimensions 520mm H x 350mm W x 170mm D
Weight 17 Kg
Maximum Inlet Water Temperature 50°C
Connection Sizes  
Water Inlet R ¾ (20mm)
Hot Water Outlet R ¾ (20mm)
Gas Inlet R ¾ (20mm)
Condensate Drain Outlet R ½ (15mm)
Power Supply  
Power Supply 230/240 VAC (50Hz)
Power Consumption - Standard 40.6W
Power Consumption - Anti-freeze 130W
Maximum Gas Consumption NG 145 Mj/hr
Maximum Gas Consumption LPG 149 Mj/hr
Maximum Capacity 25˚C Rise 21 L/min
Maximum Number of Controllers 4



Additional Information

Energy Star Rating 6.9

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Bosch Condensing C21 Continuous Flow Gas Hot Water System 0 out of 1 5 based on ratings. user reviews.