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Bosch WRD18B23 18 Litre Battery Ignition NG Gas Water Heater

Bosch gas water heaters offer innovative and energy saving features that provide temperature and flow rate control for both single- and multi-point hot water systems.

  • Wide range of capacities: 11L, 14L and 18L.
  • No electrical connection required.
  • User controls adjust flow and temperature.
  • Automatic ignition on hot water demand.
  • Non-permanent pilot flame.
  • Compact design and robust construction.
  • Available in Natural Gas or LPG (Please check locally which gas is available in your area before purchase).
  • Bosch patented hydrogeneration technology.

Click here to see how to use the gas geyser as a back-up for your Solar Water Heating System with the optional Solar Kit.

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Excl. Tax: R 6,655.65 Incl. Tax: R 7,654.00

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Product Description


Battery Ignition
Two D cell torch batteries provide the power to open the gas solenoid and fire the igniters when the unit detects water flow. Once the gas is ignited, the igniters cease firing and the water heats up rapidly.

Saving with battery operated models
If the pilot flame burns 24 hours per day the potential saving is 80-90kg of gas per year. That is as much as R450 per year (48kg gas for R448 as a refill without deposit for bottle; 2x48kg = R225 + R450).

The Multi-point Hot Water System
With a multi-point hot water system, all hot water points are supplied by a single water heater. The amount and temperature of the water used can be individually controlled at each tap unit. This type of arrangement is best used where the piping runs to the various hot water outlets are not excessively long.

The Single-point Hot Water System
In this case, separate gas instantaneous water heaters are installed directly at each hot water point – over the kitchen sink and the bath, for example. The advantage of this arrangement is the immediate availability of hot water at the point of use.


  • Powerful - However large or small your hot water requirements are, Bosch has the appliance with the output to suit.
  • Economical - Instantaneous water heaters only use energy when hot water is used
  • Safe - The built-in thermoelectric flame-failure device prevents gas leaking if the pilot light goes off.
  • Convenient - Hot water wherever and whenever needed.
  • Compact - Attractive and compact design saves space and makes these appliances ideal for both old and new properties.
  • Versatile - Whichever option you choose - point of use or central supply - Bosch has the right water heater for you.

Product Specifications

  • Model: Therm 4000 WRD18-B23
  • Output (kW): 30.5.
  • Ignition type: Battery.

Gas data

  • Gas type: Natural Gas.
  • Gas consumption: Natural Gas 3.5m³/h.

Water Data

  • Max permissible water pressure (bar): 12.
  • Minimum operating pressure (bar): 0,2.
  • Flow range (l/min): 2 - 8.8.
  • Temperature control at minimum setting: Ambient +25°C (Flow Rate: 17.6 – 14.0 l/min).
  • Temperature control at maximum setting: Ambient +50°C (Flow Rate: 2.0 – 8.8 l/min).
  • Applications: Bathroom and Kitchen.

General data

  • Voltage: N/A.
  • Frequency: N/A.
  • Dimensions (h x w x d) mm: 655 x 425 x 220.
  • Weight (excluding packaging): 16 kg.

Optional Solar Kit (Please click here for more information)
To improve the quality of hot water distribution in water heaters and boilers, while making them compatible with thermal, solar-powered systems for heating household water. Its function involves maintaining a constant setting for the temperature of the mixed water that is provided for use, when conditions for supplying hot and cold water vary. The Solar Kit can operate continuously, with hot water temperatures resulting from solar accumulation or from the support device.

Additional Information

Additional Information

Disclaimer Please note that stock availability is subject to prior sales. Prices exclude delivery. The image serves as an example of what the product looks like and may differ slightly in appearance.
Guarantee/ Warranty 12 month product warranty
Maximum Flow Rate 18 L / min


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