It is a Saturday night in July in Canberra, and the fire has been out for an hour. The steel fire pit on the lawn is already cold to the touch. The rendered hearth on the neighbour's terrace is still warm at the mantel, and people are still sitting in front of it. That difference is the whole point of a masonry outdoor fireplace, and it comes down to physics rather than price.
This explainer is for anyone who has narrowed the shortlist to a heavy unit and wants to know what they are paying for. We cover thermal mass, twin-skin walls, chimney draw and fuel switching, with the Buschbeck range as the worked example, and every unit mentioned sits in our fire pit and fireplace range. If you are still torn between an open pit and a hearth, our fire pit vs outdoor fireplace guide settles that question first.
What makes a masonry outdoor fireplace different from a steel one
Steel and masonry take heat in opposite ways. A steel bowl a few millimetres thick heats through in minutes, throws that heat straight at you, and gives it all back within minutes of the flames dying. A thick body of concrete and quartz aggregate does the reverse. It soaks up heat for the first hour or more, then radiates from the whole front face and the mantel long after the fire has dropped to coals. Engineers call this thermal mass, and backyard owners call it the reason nobody has gone inside yet.
The Buschbeck St. Moritz Fireplace and Pizza Oven ($2,599) shows the construction plainly. The structure is white quartz granite, the combustion chamber and fuel store below are brown, and a real copper insert runs across the front of the mantelpiece. The firebox is refractory, built from material made to take direct flame, and the unit meets the German TUV/GS safety standard.
| Factor | Steel fire pit | Masonry fireplace |
|---|---|---|
| Time to feel warmth | Minutes | Slow start while the body absorbs heat |
| Heat after the flames die | Gone within minutes | Radiates from the warm body for hours |
| Wind and smoke | Both chase the breeze | Firebox shelters the fire, chimney lifts the smoke |
| Moving it | Two people can shift it | Lives where it is built |
Twin-skin walls: why the outside stays cool while the inside roars
A fireplace close to a lounge setting has to be safe on the outside, and Buschbeck manages that with a twin-skin build. The firebox is one shell, the visible body is another, and air circulating in the gap between them forms a thermal barrier. The inner shell runs at full heat while the outer surface stays far cooler.
The Buschbeck Rondo Fireplace and Pizza Oven - Grey ($2,799) is built this way. Its body is a concrete formula with a rugged quartzite finish, reinforced with steel, and nothing needs painting or plastering. Buschbeck describes the twin-skin system as keeping the outside cool and safe enough to touch. On the St. Moritz, the same double-skinned build is what lets it burn several types of fuel.
The chimney does the quiet work: draw, smoke and wind
Hot gas is lighter than the air around it, so it rises up the flue and pulls fresh air in through the firebox opening. That pull is called draw. It is why a fireplace lights more easily than an open bowl, burns steadily on a gusty night, and sends smoke away above head height instead of after whoever just sat down.
Draw needs a chimney tall enough for its position and joints that are sealed, which is why the sections are bedded in a masonry mortar that also closes air leaks around the flue. Near a wall, under an eave or right beside the seating, a taller stack helps. The Buschbeck Chimney Extension - Standard ($199) adds 34 cm in the same white quartz surface, though check that your cover still fits once it is on.
One firebox, three jobs: open fire, BBQ and pizza oven
Thermal mass is also what makes these units cook well. A hot masonry chamber gives steady radiant heat from every side, the way a bread oven does, rather than the one-directional blast of a steel plate. Both Buschbeck fireplaces carry four adjustable cooking heights and a heavy duty chrome cooking grate, with a fuel store underneath that takes logs and charcoal.
The fuel switches with the job. Buschbeck's guidance is charcoal first for cooking, because it settles into an even bed of coals quickly, then logs when you want tall flames and the long slow burn that charges the masonry. Pizza is the third mode. The Buschbeck Pizza Insert ($399) slides into the firebox over hot coals and lifts out when you want the fire open. Its soapstone pizza stone and steatite plate use that rock because it resists sudden changes in temperature.
Timing, weather and the rules in Australia
The practical consequence of all this is timing. Light a masonry fireplace as guests arrive and it feels cold for the first hour, then hits its stride after they leave. Light it well before you plan to sit down and the fire does the early work while the masonry does the late work. Keep the first few fires small so the structure cures gradually, as your manual will say.
Masonry's weak point is water. Rain soaks into a porous surface and heat drives it out as steam, which over time can lift the finish or open a joint. Keep the unit covered between fires, empty the fuel store of damp wood over summer, and dry a wet unit with a small fire before a big one. Buschbeck suggests a jet wash of the surface when it looks weathered.
A masonry fireplace burns solid fuel, so it counts as an open fire on total fire ban days and under council wood-smoke rules, which vary by state and council. Strata by-laws often restrict open flame altogether. Check with your local authority before the base goes in, because a unit this heavy is not something you move after a complaint. That base must be level, solid, non-combustible and able to carry the assembled weight, so think concrete slab or well-laid pavers, never decking. Installation is available on request.
Masonry outdoor fireplaces: frequently asked questions
Why does a masonry outdoor fireplace stay warm after the fire goes out?
Because the body stores heat while the fire burns and releases it slowly afterwards. A thick concrete and quartz structure absorbs energy for the first hour or more, then radiates it from the whole front face for hours after a steel pit would be cold.
Is the outside of a Buschbeck fireplace safe to touch while it is lit?
On the twin-skin Rondo, yes, according to Buschbeck, because air circulating between the firebox and the outer body keeps the exterior cool enough to touch. The opening, the cooking grate and any metal near the fire are still hot, so keep children and pets back.
Can rain damage a masonry outdoor fireplace?
Yes, slowly, if you let it stay wet. Water soaks into masonry and turns to steam when the fire is lit, which can lift the finish or open joints over the years. A fitted cover between fires and a small warming fire after wet weather prevent nearly all of it.
Can you burn charcoal and wood in the same Buschbeck fireplace?
Yes, and the two do different jobs. Buschbeck's guidance is charcoal first for cooking, then logs or firewood when you want tall flames and a long burn to sit around, and the storage area underneath takes both.
Shop the range
The Buschbeck fireplaces, insert and extension sit in our heating and fire range, and the wider fire pit collection holds them alongside chimeneas and open bowls. A Buschbeck Cover ($139) is the simple insurance: full length, heavy duty and UV-resistant vinyl, made to fit the unit all year round. Every order comes with Australia-wide delivery, free delivery on orders over $100, and most orders are dispatched in 3-10 business days, with 30-day returns and no restocking fee.
