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Bosch WRD18G31 18 Litre Hydro Ignition LPG 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 6,423.48 Incl. Tax: R 7,387.00

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Product Description


All it takes to fire up a WR-Range water heater, is the opening of a tap. Ignition is achieved with the help of a battery or the Bosch Hydro Power ignition system making use of the most clean and economical energy source possible: the force of the water is responsible for the ignition of the burner.
The exclusive hydrodynamic generator makes use of waterpower in order to produce the energy required to feed the electronic circuits and trigger the ignition. In so doing the utilisation of external power sources are negated. The WR-Range of water heaters with hydrodynamic generator ignition have a wide range of power, which enables them to work in any installation.
The ignition pressure is 0.35 bar, making it the lowest of all appliances of this type. Simply put, a Bosch ignites where others cannot.


  • 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-G31
  • Output (kW): 30.5.
  • Ignition type: Hydro.

Gas data

  • Gas type: LPG.
  • Gas consumption: LPG - butane/propane 2.79kg/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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