How does a closed combustion fireplace work?

Air enters the sealed firebox through adjustable vents, feeds the fire, and the flue draws combustion gases out. A secondary air supply reburns the smoke before it leaves, which is why these units produce more heat and less soot from the same wood.

Can I convert my existing open fireplace?

In most cases yes. We fit an insert into the existing opening and reline the chimney with the correct flue. We inspect the chimney first to confirm it is sound and sized correctly.

What wood should I burn?

Dry hardwood with a moisture content under 20 percent, such as well-seasoned bluegum or rooikrans. Wet wood halves your heat output and coats the glass and flue with tar.

How often does it need servicing?

Once a year before winter. We sweep the flue, check the door rope seals and glass, and inspect the baffle plate.

Fireplace guide

Closed combustion fireplaces in Cape Town: the complete guide

A closed combustion fireplace burns wood inside a sealed firebox behind a glass door, with air supply you control. It puts far more heat into the room than an open fireplace and uses a fraction of the wood. Here is what Cape Town homeowners should know before installing one.

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Closed combustion fireplace installed in a Cape Town lounge

What is a closed combustion fireplace?

In an open fireplace most of the heat disappears up the chimney along with warm room air. A closed combustion unit seals the fire behind heat-resistant glass and draws its air through controllable vents, so the fire burns slower, hotter and cleaner.

Typical efficiency is 70 to 80 percent against roughly 15 percent for an open hearth. For a Cape Town winter that means a warm lounge on two or three logs an evening instead of a bag of wood.

Sealed firebox with controllable primary and secondary air
Radiant heat from cast iron or steel, plus convected warm air
Far less smoke and soot in the room
Safer around children and pets than an open fire

Installation requirements in Cape Town homes

The flue does most of the work. It must be the correct diameter for the unit, insulated where it passes through the roof, and finish high enough above the roofline to draw properly in Cape Town's wind. Older Bellville and Durbanville homes often have an existing chimney that can be relined rather than rebuilt.

Clearances to combustible surfaces, a non-combustible hearth and a proper heat shield behind the unit are all part of a compliant installation. We handle any core drilling and brickwork ourselves, so one team finishes the job.

What it costs and what it saves

Pricing depends on the unit, the flue run and whether an existing chimney can be reused. A freestanding closed combustion unit with a straight flue through a pitched roof is the most affordable route; a built-in insert with cladding and a new chimney breast costs more.

Against those costs, wood use typically drops by half to two thirds compared with an open fireplace, and the heat reaches the whole living area rather than just the person sitting closest to it.

Frequently asked questions

Still unsure? Call 021 945 3636 or 0875500413 and we will talk it through.

Keep reading

We work from 189 Durban Rd, Bellville, Cape Town, 7530 and install across Cape Town and the Western Cape. Email info@progressinstallations.co.za for advice on your project.

Request a free fireplace quote

Tell us about your home and the fireplace you have in mind, and we will come back with options and pricing.