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Bosch OptiFlow Professional (4000S) External 12L Continuous Flow Hot Water System

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  • AU owned & operated for 50 years

Quick Overview

The Bosch OptiFlow Professional (4000S) External is an electronically controlled continuous flow water heater, designed for an easy upgrade from Bosch Pilot & HydroPower models*.

Features and Benefits

  • 6 star efficiency
  • Electronically Controlled Modulation
  • Delivers 12 L/min at a 25°C temperature rise
  • Compact Design
  • Suitable for 1 bathroom
  • Designed for an easy change-over between both the Bosch HydroPower & Pilot models*
  • 12L, low gas load model
  • External installation only
  • 50°C locked options available
  • Available in Natural or LP Gas
  • Warranty
    • 3 Years - Parts and Labour
    • 12 Years - Heat Exchanger (part only)

*Requires External 240V power point

Star Rating
Bosch OptiFlow Professional (4000S) External 12L Continuous Flow Hot Water System

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Bosch 4000S External 
Part Number NG 7736502491
Part Number LPG 7736502492
Part Number 50C Limited NG 7736502493
Part Number 50C Limited LPG 7736502494
Installation External
Ignition Electronic
L/min (25C Rise) 12
No. of Bathrooms 1-2
Min. inlet water pressure (kPa) 100
Min. constant water pressure for max flow (kPa) 100
Max inlet water pressure (kPa) 1000
Mj/H 90
Star rating 6
Unit Height (mm) 568
Unit Width (mm) 300
Unit Depth (mm) 170
Dry Weight (kg) 10
Gas Type NG/LPG
Domestic Warranty  
Parts & Labour 3
Heat Exchanger (part only) 12
Min. constant water pressure for max flow (kPa) -

Additional Information

Bosch OptiFlow Professional External Flyer

Additional Information

SKU 773650249
Energy Star Rating 6.0


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Bosch OptiFlow Professional (4000S) External 12L Continuous Flow Hot Water System 0 out of 1 5 based on ratings. user reviews.