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Dewhot 20L Fan Forced Gas Geyser

20L Gas Geyser Indoor Fan Forced

The compact indoor Room Sealed Fan Forced 20L Gas Geyser is one of the safest and most efficient gas water heaters on the market.

TYPE C Install indoors with a flue
Shipped with a free large solid flue

Or split into 4x interest-free payments Learn more


Hot water demand

Designed for medium sized homes, the 20L Fan Forced Gas Geyser maintains a consistent temperature when running multiple outlets at the same time.

Energy saving

Fan-forced efficiency provides maximized energy savings by heating only what you need.

Triple safety

The fan removes fumes, auto shut-off prevents leaks, and pressure relief safeguards for worry-free hot water.

  • Heavy-duty copper radiator
  • 88% energy efficiency
  • Can be installed in confined and unventilated spaces
  • Wind resistant burner
  • Pressure Relief Protection (to function effectively,
    the valve must be set to your water pressure)
  • Touch button temperature control
  • Compatible with mixer taps
  • Ensures constant temperature when multiple outlets
    are used simultaneously
  • Compact design with a brushed Aluminium cover
  • Flame failure safety device
  • Inverter compatible

Cylinder vaporisation rates
(maximum short term use)
48kg = 1,9kg/hr
19Kg = 0,92kg/hr
9kg = 0,46kg/hr
Minimum cylinder size = 48kg
Minimum regulator size = 4kg/hr
Flue size = 130mm
Minimum ID pipe size
16mm = less than 8 meters
20mm = between 8-25 meters

  • Max gas pressure 2.8kPa

  • Max gas consumption 2.9 kg / hour

  • Rated heat Input 40Kw

  • Rated electric power 45W

  • IP rate IPX4D

  • Water pressure 25-500 kPa

  • Water Output (min/max) 2.5L - 20L / min

  • Unit weight 17.2 Kg

  • Packaged weight 18.7 kg

  • Unit size 575 x 365 x 133 mm (+200 for flue)

  • Packaged size 740 x 430 x 220mm

  • Rated voltage 240V/60Hz

Sku: RS20DH

Dewhot 20L Indoor Fan Forced Gas Geyser overview

Dewhot gas geyser double tested policy- commitment to product quality

The Dewhot Bucket Test : Determine your flow rate

How to choose your type of Gas geyser

Indoor Fan Forced 20L Gas Geyser FAQs

20L Fan Forced Geyser are designed for medium-sized homes and are multiple-use geysers which means you can run your outlets simultaneously.

  • 3 x showers + basin
  • 1 x Bath + 2 showers + basin

Remember: for optimal performance, ensure the total water flow from all outlets doesn’t exceed 16 litres per minute.

Do the bucket test to determine your flow rate demand and make an informed decision when choosing your geyser size.

The 20L rating indicates the geyser can collectively heat 20 litres of water per minute. You will never run out of hot water as long as you have gas.

The 20L capacity is ideal for medium sized homes. It can service 3 showers and a sink, or 1 bath, 2 showers and a sink simultaneously.

The fan forced gas geyser is the most efficient and the cost of heating a litre of water is the same regardless of the size of the geyser. The maximum amount of water a 20L gas geyser can heat at any one time is 20 litres – and this large capacity enables you to service taps from multiple sources at the same time. For example: If all your taps have a flow rate of 10 litres per minute each, and you run one outlet for 1 minute, you will only pay for 10 litres of heating. But if you are running 2 outlets at the same time for 1 minute, you will pay for 20 litres of heating.

Help me choose my geyser

The logic tree is a tool that guides you through a series of questions to help find the gas water heater solution the would be most suitable for your individual home set up.

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