A gas fireplace gives you a real flame and instant heat at the turn of a knob, with no wood, smoke or ash, and it keeps working through load shedding. The key choice is between a flued gas fireplace, which vents combustion gases outside, and a vent-free (flueless) model, which releases them into the room and depends on strict room-size and ventilation rules. Either way, it must be installed by a registered gas installer who issues a Certificate of Conformity.
Flued vs vent-free gas fireplaces
| Flued (conventional or balanced flue) | Vent-free (flueless) | |
|---|---|---|
| Where combustion gases go | Outside, through a chimney or flue pipe | Into the room |
| Needs a chimney or flue | Yes (existing chimney, flue pipe or wall vent) | No |
| Ventilation requirements | Set by the manufacturer and installer | Strict: minimum room size and permanent vents |
| Heat into the room | Good; some heat lost up the flue | High, as no heat goes up a flue |
| Moisture and odour | Vented outside | Added to the room |
| Bedrooms and bathrooms | Check the manufacturer’s rules | Not suitable |
| Flame appearance | Often taller, more realistic | Often smaller, cleaner-burning flame |
| Installation | Registered gas installer, plus flue work | Registered gas installer |
| Price band | Mid to premium | Mid to premium |
Flued gas fireplaces
A conventional flued gas fireplace uses an existing chimney or a dedicated flue pipe. Gas grates and gas log sets that go into an existing open fireplace usually work this way.
A balanced flue (sometimes called direct vent) unit is sealed behind glass. It draws combustion air from outside and vents gases outside, often through a short pipe in an external wall. That makes it the safest choice for indoor air quality and gives more freedom on where to put the fireplace.
Vent-free (flueless) gas fireplaces
Flueless fireplaces burn very cleanly but still release water vapour, carbon dioxide and other combustion products into the room. They’re designed for rooms above a minimum size, with permanent ventilation openings, and manufacturers’ manuals typically rule them out for bedrooms and bathrooms. Your installer must check the room against the manufacturer’s requirements and the installation code, SANS 10087-1. If your room is too small or can’t be ventilated, choose a flued model.
Gas fireplace styles
- Gas inserts that fit into an existing fireplace opening.
- Gas grates and log sets that convert an open fireplace to gas.
- Built-in units for new walls or cladding, including wide “letterbox” designs.
- Freestanding gas stoves that look like wood stoves.
- Double-sided and corner units.
Installation and the gas CoC
Gas fireplaces are fixed gas installations. In most South African homes the gas comes from 19 kg or 48 kg LPG cylinders standing outside, connected by a regulator and copper or approved piping into the house.
- The installation must be done by a gas installer registered with SAQCC Gas, following SANS 10087-1 and the manufacturer’s instructions.
- The installer assesses the cylinder position, pipe route, ventilation and, for flued models, the flue.
- When the work is complete, the installer issues a Certificate of Conformity (CoC). Keep it: insurers can refuse claims for gas installations without one, and you’ll need a valid CoC when you sell the property.
- Any changes to the installation later need to be done and certified by a registered installer too.
- Check whether your municipality requires plans for a new flue or chimney (fireplaces and chimneys fall under Part V of the National Building Regulations, with SANS 10400-V as the deemed-to-satisfy standard). Estates and body corporates may have their own rules on cylinders and flues.
Read more in our gas compliance certificate guide, or get quotes from registered gas installers.
Cylinder placement basics
- Cylinders stand outside, upright, on a firm level base, away from drains, windows, doors and sources of ignition, at the distances your installer specifies.
- Many homes use two cylinders with a changeover valve, so you can swap one while the other keeps the fire going.
- A lockable cage helps prevent theft.
Running costs
There’s no fixed running cost, because LPG prices and usage vary. Work it out with your own numbers:
Cost per hour = gas consumption (kg/h) × your price per kg
- Find the consumption in the manual or on the rating plate. If you only have the kW input rating, LPG contains roughly 13 to 14 kWh of energy per kg, so divide the kW by about 13.5 for an approximate kg/h on full.
- Price per kg = the refill price ÷ the cylinder size (19 or 48).
- Most gas fireplaces have a high and low setting, and you’ll often run on low once the room is warm.
To estimate how long a cylinder lasts, divide its size in kg by the consumption in kg/h. Compare the result with our oil heater vs gas heater guide if you’re weighing up gas against electric heating.
Brands sold in South Africa
Gas fireplaces, gas inserts and gas grates are sold locally by brands including Jetmaster, Megamaster and Chad-O-Chef, as well as importers and specialist fireplace showrooms. Many specialist showrooms work with registered gas installers or can recommend one. When comparing models, check:
- Flued or flueless, and the minimum room size
- kW input and heat output
- Ignition (manual, piezo or electronic) and whether it needs electricity
- Safety devices: flame failure and, on flueless models, an oxygen depletion sensor (ODS)
- Whether installation, cylinders and piping are included in the quote
Safety and care
- Have the fireplace serviced as the manufacturer recommends, typically before winter.
- Do a soapy-water leak test on the cylinder connections when you change cylinders, and call your installer if you smell gas.
- A yellow, sooty flame or soot marks on the glass or wall mean it needs attention.
- Keep the glass guard on; the glass gets very hot. Use a safety screen if you have small children.
- Fit a carbon monoxide alarm in the room (see smoke and CO detectors).
- Don’t place decorations or anything flammable on or near the fireplace beyond the manufacturer’s clearances.
For portable gas heaters, see our gas heater safety guide.
FAQ
Are vent-free gas fireplaces safe?
They can be when installed by a registered gas installer in a room that meets the manufacturer’s minimum size and ventilation requirements. They’re not suitable for bedrooms, bathrooms or small rooms, and a CO alarm is a sensible extra precaution.
Do I need a chimney for a gas fireplace?
Not always. Flued models need a chimney or a flue pipe, though balanced-flue units can often vent through an outside wall. Vent-free models need no flue but have strict ventilation rules.
Do gas fireplaces work during load shedding?
Most do, since they burn gas. Some models use electronic ignition, fans or remote controls that need power or batteries, so check the specification if this matters to you.
Can I convert my wood fireplace to gas?
Yes, with a gas insert, gas grate or log set designed for that purpose. A registered gas installer must do the gas work, and the chimney should be checked and swept first.
More heating & fireplaces guides
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Closed combustion fireplace guide: wood stoves explained
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