A gas geyser heats water only while a tap is open. Water flows through a heat exchanger, the burner fires and hot water comes out, with no tank to keep warm. Many households fitted one during load shedding and kept it. Getting it right means choosing the size in litres per minute, deciding between an outside unit and an inside one with a flue, checking water pressure and matching the cylinder. Tell us about your house and local installers will send gas geyser prices and installation quotes for free, with no obligation.
Sizes in litres per minute
Tankless gas geysers are sized by how many litres of hot water a minute they can deliver. A small unit suits one basin or a single shower. A 16 L unit is a common choice for a family home, and larger units serve houses where two showers and the kitchen run at the same time. Ask the installer to size it from the number of bathrooms, whether people shower at the same time and how far the geyser is from the taps. Winter matters too: colder incoming water on the Highveld or in the Karoo means the same unit gives less hot water at a time.
Outside, or inside with a flue
The burner needs air and its fumes must go somewhere safe. A badly vented gas appliance can produce carbon monoxide, which you cannot see or smell. That gives two options:
- an outdoor model on an outside wall, with its own weather protection
- an indoor model with the correct flue taking fumes outside
Never fit an outdoor unit inside a bathroom, scullery or garage. The installer decides the position and flue route under SANS 10087-1.
Water pressure and the cylinder
A gas geyser needs enough water flow to fire. Very low pressure, common on some gravity fed or rainwater tank systems, can stop it lighting, so tell the installer how your water arrives. A booster pump is sometimes the answer.
For gas, most homes run a geyser from 48 kg cylinders, often two on a changeover valve so hot water does not stop when one runs out. A 9 kg cylinder empties quickly on a family geyser. Ask a gas delivery service to swap them.
Installation, CoC and servicing
Fitting a gas geyser is a gas installation: gas line, water connections, the flue or outside position, a leak test and a CoC from an SAQCC Gas registered practitioner. Keep the certificate with your house papers. A yearly service keeps the burner clean and checks the flue, the ignition and the water valve. A yellow, lazy flame, soot or a geyser that keeps going out are reasons to call a practitioner.
What to include in your request
- Number of bathrooms and showers used at once
- How your water arrives and the pressure
- Inside with a flue or on an outside wall
- Cylinders you have, or 48 kg needed
- Supply and install, or install only
Gas Geysers for different clients
- Homeowners: a tankless gas geyser on an outside wall fed by two 48 kg cylinders
- Complexes, estates and body corporates: unit geysers placed where the body corporate allows cylinders and flues
- Restaurants, takeaways and bakeries: hot water for kitchen sinks and dishwashing from a gas geyser near the scullery
- Guest houses, lodges and venues: guest showers in lodges and guest houses run on gas geysers per chalet
- Farms and smallholdings: a farmhouse or staff housing geyser on gas where the power is unreliable
- Factories, warehouses and workshops: change rooms and wash bays with hot water from a gas geyser
- Campers, caravanners and event hosts: holiday homes and campsite ablutions with gas hot water on demand
- Gas installers, plumbers and dealers: plumbers supplying gas geysers and calling in a practitioner for the CoC
Frequently asked questions
What is the price of a gas geyser installed?
What size gas geyser do I need?
Can a gas geyser be installed inside the house?
Where can I find a gas geyser for sale and installed?
Gas Geysers by province and city
- Johannesburg
- Pretoria
- Centurion
- Midrand
- Sandton
- Randburg
- Roodepoort
- Krugersdorp
- Randfontein
- Germiston
- Boksburg
- Benoni
- Kempton Park
- Alberton
- Vanderbijlpark
- Vereeniging
- Durban
- Pinetown
- Pietermaritzburg
- Richards Bay
- Newcastle
- Ladysmith
- Gqeberha (Port Elizabeth)
- East London
- Kariega (Uitenhage)
- Mthatha
- Cape Town
- Bellville
- Paarl
- Stellenbosch
- George
- Worcester
- eMalahleni (Witbank)
- Middelburg
- Secunda
- Mbombela (Nelspruit)
- Rustenburg
- Brits
- Klerksdorp
- Potchefstroom
- Mahikeng
- Polokwane
- Tzaneen
- Kimberley
- Upington
- Bloemfontein
- Welkom
- Sasolburg