The Complete Buyer's Guide to Concrete Gas Fire Pits
Why GFRC Is Worth the Upgrade
Not all concrete fire pits are built the same. The material inside your enclosure makes a real difference in how long it lasts.
Standard poured concrete looks solid, but it absorbs water. When that moisture freezes in winter, it expands inside the concrete and causes surface cracks and flaking. Give it a few outdoor seasons and you'll see it.
GFRC (glass-fiber reinforced concrete) is concrete that's been reinforced from the inside out with fine glass fibers. It's 60 to 75 percent lighter per panel, far stronger, and essentially doesn't absorb moisture. It handles hundreds of heat cycles without the hairline cracks that show up in standard concrete.
If you're investing in a permanent outdoor piece, GFRC is the version worth buying the first time.
Concrete Fire Pit Weight: Can Your Deck or Patio Handle It?
Concrete fire pits look stunning and last a lifetime, but they are incredibly heavy. You need to verify that your outdoor surfaces can safely support them before installation.
- How heavy are they? A mid-size concrete fire table typically weighs 200 to 400 pounds. Larger pre-cast setups can easily top 800 pounds once you add the burner hardware and heavy fire media.
- On Wood or Composite Decks: Most residential decks are rated for 40 to 60 pounds per square foot. Because a concrete unit concentrates hundreds of pounds onto one small footprint, it can easily exceed these limits. Always have a structural engineer check your deck framing before installing one.
- On Concrete Patios and Slabs: Ground-level surfaces can also shift. If the sub-base soil isn't perfectly compacted or the concrete slab is thin, heavy weight can cause the ground to settle unevenly. This is especially true after a wet winter, which can lead to cracks or cause your fire pit to tilt.
Finding the Right Gas Fire Pit Style for Your Yard
Choosing a gas fire pit comes down to how you plan to use your outdoor living space. Here is a quick breakdown of the most popular styles and how they fit into your design.
Gas Fire Tables: Ideal for Entertaining
Gas fire tables blend ambiance with utility. Because the burner is recessed into a flat tabletop, you get cozy warmth alongside plenty of space to set down drinks and small plates. They make the perfect centerpiece for patio conversational seating like sectionals or outdoor armchairs.
Gas Fire Bowls: A Modern Design Statement
Fire bowls lift the flame higher up inside bold geometric shapes like circles or squares. They prioritize visual impact over tabletop space. Use them as architectural focal points on open terraces, at the end of walkway sightlines, or beside a pool deck to catch reflections on the water.
Fire & Water Features: The Ultimate Statement Piece
These installations combine live flames with cascading water in a single unit. While they require professional setup for plumbing and gas lines, the result feels like a luxury resort. They offer an incredible sensory experience and are great for masking ambient neighborhood noise.
Ready-to-Finish Enclosures: Built for a Custom Look
Ready-to-Finish (RTF) frames provide a pre-engineered, fire-safe core that is ready for masonry. You or your contractor can finish the exterior with stacked stone, brick, tile, or stucco. It gives you a fully custom look without the structural guesswork.
Fire Pit Accessories: The Finishing Touches
The media you put inside your fire pit changes how the flame behaves. Lava rock breaks up gas flow for a rugged, natural campfire look, while uniform fire glass creates a clean, modern shimmer. Don't forget functional extras like glass wind guards to keep flames steady and heavy-duty weather covers to protect the burner from rain.
Gas Line Basics: What to Know Before You Install
Getting the gas supply right is the secret to a beautiful, reliable flame. Here are the three most important things to check before finalizing your setup:
- Natural Gas Pressure: Natural gas requires a steady, low-pressure supply (typically 7 to 14 inches of water column) to ignite cleanly. If the pressure is off, your flame will look weak, sputter, or struggle to stay lit.
- Propane Regulators: Liquid propane lines require an inline regulator to safely lower the tank's raw pressure before it reaches the burner. Without one, you risk dangerous, unpredictable flame heights and permanent valve damage.
- Flexible Connectors: Always connect the burner using a flexible, corrugated stainless steel hose rather than rigid pipe. Concrete expands and shifts slightly as it heats up and cools down; a flexible connector absorbs this movement so your fittings don't crack.
Liquid Propane Ventilation: A Safety Rule You Cannot Skip
If your outdoor fire pit runs on liquid propane (LP), built-in ventilation is absolutely mandatory.
Unlike natural gas, propane is heavier than air. If your burner doesn't ignite immediately, or if there is a tiny leak, the unburned propane won't float away. Instead, it sinks and pools at the bottom of the hollow fire pit enclosure, creating a serious invisible hazard.
To prevent this, your fire pit must have vent openings built into the very bottom of the base so trapped gas can safely escape. Always check your manufacturer’s specifications for the exact vent size required before you seal up the exterior panels.
Bring Your Hardscape to Life with a Concrete Gas Fire Pit
Whether you are choosing between a concrete fire table for outdoor dining, a geometric bowl for poolside drama, or a Ready To Finish enclosure for a fully custom masonry build, our NFI certified experts are here to help you get it right. Call us anytime for friendly, knowledgeable support, and enjoy free shipping on all qualifying orders over $99.
