Gas geyser installation in Durban is mostly a sizing exercise. Get the litres-per-minute rating wrong and you have bought a unit that goes cold whenever two taps run, which no amount of good installation work will fix.
This page covers sizing, where the unit can mount, what the installation involves, what it costs, and what to check before you buy the geyser rather than after.
Tell us how many bathrooms and whether the kitchen tap runs at the same time.
Get Gas Geyser Installation QuotesSizing a Gas Water Heater
Gas geysers are rated in litres per minute of temperature-raised water, not in storage volume. The number you need is set by how many outlets might run simultaneously, and by how cold the incoming water is. On the coast that swing is modest, but Durban inlet water is still noticeably cooler in July than in February, and in Hillcrest, Kloof or Pietermaritzburg the winter drop is considerably larger.
| Rating | Realistically supports | Suits |
|---|---|---|
| 8 – 10L/min | One outlet at a time | A flat, a cottage, a single shower |
| 12L/min | One shower comfortably, kitchen tap at a push | Small home, one bathroom |
| 16L/min | A shower plus a basin, or a bath | The common family-home size |
| 20L/min | Two showers, or a bath plus kitchen | Three or more bathrooms |
| 26L/min+ | Multiple simultaneous outlets | Guest houses, large homes |
Winter is still the design case, even with Durban's mild winters. A unit that is comfortable in February at 12L/min has less in hand in July, when the inlet water is cooler and the burner works harder for the same outlet temperature. Size up rather than down if you are between two options, and more so in the Upper Highway or Pietermaritzburg.
Where the Unit Can Mount
- Outdoor units mount on an external wall and are the simplest option: no flue and straightforward ventilation. Weather is the trade-off, and in Durban that means salt air and humidity corroding the casing, fittings and flue cowl, plus summer storms driving rain at an exposed wall. Within a kilometre or two of the sea, from Umhlanga to Amanzimtoti, a sheltered wall or a unit with a coated or marine-grade casing is worth asking about.
- Indoor units need a correctly installed flue to outside and adequate room ventilation. More work, better protected, and the only option where there is no suitable external wall.
- Distance to the outlets matters. Every metre of pipe between the geyser and the shower is water you run off before it gets hot. Mounting it on the wall nearest the bathrooms beats mounting it wherever the gas already is.
- The cylinder position constrains everything. A geyser is a heavy gas load, so it needs to be reachable by a properly sized line from a cylinder position that is itself compliant.
What the Installation Involves
- Water demand assessed and the unit sized, ideally before you buy anything
- Mounting position agreed against water routes, gas routes and ventilation
- Cylinder capacity checked or upgraded, usually to a 48kg pair on changeover
- Gas line run and sized for the geyser's peak draw plus anything else on the system
- Cold feed and hot outlet plumbed in, and existing hot water re-routed if replacing electric
- Flue fitted and terminated correctly for an indoor unit
- Pressure test, commissioning, temperature set, and the certificate of conformity issued
Gas Geyser Installation Cost
| Item | Indicative range | Notes |
|---|---|---|
| 12L unit supplied | R3,500 – R7,000 | Entry to mid brands |
| 16L unit supplied | R5,500 – R11,000 | The common size |
| 20L+ unit supplied | R9,000 – R18,000 | Larger homes |
| Installation, outdoor mount | R3,800 – R7,000 | Gas and water connections |
| Installation, indoor with flue | R5,500 – R9,500 | Flue and ventilation included |
| Cylinder pair and changeover | R5,000 – R10,500 | Where none exists |
| Replacing an electric geyser | R8,500 – R20,000 | Including plumbing re-route |
| Certificate of conformity | R950 – R2,200 | Often included, confirm it |
| Total, supplied and installed | R9,000 – R22,000 | Unit and installation together |
Indicative ranges, not quotations. The cylinder position, the distance to the bathrooms and whether an existing electric geyser has to be decommissioned are what move the number.
Get quotes on the unit and the installation together so you can see the real total.
Compare Gas Geyser QuotesMultiple Outlets and Recirculation
Two bathrooms at opposite ends of a house on one geyser is the arrangement that disappoints people most. The unit may be big enough, but the far bathroom runs cold water for thirty seconds before anything arrives. Options are a second geyser near the far outlets, or a recirculation loop with a pump, which costs more and adds a small standing gas load. Worth raising with the installer at quote stage rather than discovering it afterwards.
Compliance and Servicing
The installation needs a certificate of conformity on completion, and a new one whenever the geyser is replaced or moved. Gas geysers also need routine servicing to keep the heat exchanger and burner clear, particularly where borehole water feeds the unit or it sits in salty coastal air, which is covered on Gas Geyser Servicing Durban.
Frequently Asked Questions
What size gas geyser do I need?
One bathroom is comfortable on 12L/min, a family home with a bathroom and an en suite on 16L/min, and three or more bathrooms on 20L/min or larger. Size against simultaneous outlets in winter rather than average summer use.
What affects gas geyser installation cost?
The mounting position, whether the unit is indoors and needs a flue, the distance from the cylinder, whether cylinder capacity has to be upgraded, and whether existing hot water plumbing has to be re-routed from a decommissioned electric geyser.
How much does a gas geyser cost installed in Durban?
Supplied and installed, commonly R9,000 to R22,000 depending on the unit size and the installation. Installation alone, with the unit bought separately, typically runs R3,800 to R8,500 outdoors and R5,500 to R9,500 indoors with a flue.
Can a gas geyser be installed indoors?
Yes, with a correctly installed flue discharging outside and adequate room ventilation. It costs more than an external mount and is the right answer where there is no suitable outside wall, or where an exposed position near the sea would take the full force of salt air and summer storms.
Can a gas geyser replace an electric geyser?
Yes, and it is a common Durban conversion. The electric unit is isolated and usually removed, and the hot water plumbing is re-routed to the new gas unit. Budget R8,500 to R20,000 including the plumbing work.
How much gas does a geyser use?
Considerably more than a hob. A household with a 16L/min geyser and a hob commonly runs through a 48kg cylinder in four to ten weeks, faster in winter. Two cylinders on automatic changeover is the sensible arrangement.
Does a gas geyser work during load shedding?
Fully electronic-ignition units need power for the control board. Battery-ignition models do not. If uninterrupted hot water during load shedding or the outages that follow Durban summer storms is the reason you are switching, confirm which ignition type the model uses before buying it, and ask about surge protection for mains-powered units.
Gas geyser quotes, unit and installation, are compared through Gas Installers Durban at no cost.
Related Services
Gas Installers Durban is a free quote-matching service. The gas work is carried out by the independent registered installers that quote you, and your contract is with the installer you appoint. Ask each installer for their registration and insurance details before appointing anyone.
Describe the job once and compare quotes from LEADERR APPROVED gas installers covering your area.
Get 5 QuotesGet Gas Geyser Installation Durban Quotes
Send your bathroom count and where the geyser would mount, for installation quotes.
Free to use, no obligation. Your request goes to LEADERR APPROVED gas installers covering your area, who quote you directly.
