By Colin FosterUpdated November 2026
Building a fire pit using retaining wall blocks is one of the most practical backyard projects you can take on. The blocks are stackable, widely available in many sizes and colors, and they give you a clean, durable ring that holds up to heat better than many decorative materials. This guide compares three fire pit inserts that work well with block surrounds. Our selection criteria were specifications, brand reputation, the size and fit of each insert relative to standard retaining wall block openings, and owner feedback patterns about heat performance, ease of installation and long-term durability.
Our top picks at a glance
- 1
TOP CHOICEBest overallBlue Sky Outdoor Living 36" Square Smokeless Fire Ring InsertView on Amazon - 2
Best for compact backyardsBreeo Zentro Fire Pit Insert, Stainless Steel, Square 24 in with LidView on Amazon - 3
Best for gas-ready buildsFiregear Paver-CP-MT Block and Paver Control Panel for MT BurnerView on Amazon
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Blue Sky Outdoor Living 36″ Square Smokeless Fire Ring Insert | Larger backyard gatherings | Double-wall smokeless design with a 36-inch square footprint |
| Breeo Zentro Fire Pit Insert, Stainless Steel, Square 24 in with Lid | Compact patios and small yards | Stainless steel construction with a fitted lid |
| Firegear Paver-CP-MT Block and Paver Control Panel | Block-built gas fire features | Control panel designed for block and paver installations with an MT burner |
Blue Sky Outdoor Living 36″ Square Smokeless Fire Ring Insert
Smokeless Fire Ring for Outside Fire Pit, double-wall, powder-coated steel insert, standalone/ block surround, large capacity Blue Sky Outdoor Living 36" Square Smokeless Fire Ring Insert
Best for: Larger backyard gatherings and builders who want a wide, stable fire opening inside a block surround.
This insert suits homeowners planning a generous fire ring who want to set it inside a stacked block wall of about 36 inches square. Its size makes it a good match for groups of six or more seated around the fire, and the square shape lines up neatly with the straight courses of retaining wall blocks.
Key specs:
- Square format, 36 inches across (per the listing name)
- Double-wall smokeless design
- Powder-coated steel insert
- Suitable for standalone use or within a block surround
Pros:
- Large opening gives a generous fire and seating area
- Double-wall construction is designed to reduce visible smoke
- Square shape fits neatly within straight block courses
Cons:
- Its size requires a larger, level base and more blocks
- Heavier to move once the surround is built
Bottom line: A strong choice for families and entertainers who have the space for a large block-built fire ring and want a dependable smokeless insert.
Breeo Zentro Fire Pit Insert, Stainless Steel, Square 24 in with Lid
Smokeless firepit ring insert for outside block, stone & concrete backyard surrounds Breeo Zentro Fire Pit Insert – Stainless Steel, Square 24 in with Lid
Best for: Compact patios and small yards where a tighter block fire pit is the goal.
This 24-inch square insert is designed for builds with a smaller footprint. It is a good fit for a two-to-four-course block surround in a tight space, and the lid makes it easier to keep the pit covered between uses.
Key specs:
- Square format, 24 inches (per the listing name)
- Stainless steel construction
- Includes a lid
- Designed for use with stone and concrete block surrounds
Pros:
- Compact size suits small patios and limited yards
- Stainless steel resists rust better than many painted metals
- Lid helps protect the insert and keep debris out
Cons:
- Smaller opening means a more intimate fire, not a large group fire
- Stainless finish can show heat discoloration over time
Bottom line: Best for homeowners who want a neat, low-profile block fire pit and prefer a lidded, corrosion-resistant insert.
Firegear Paver-CP-MT Block and Paver Control Panel for MT Burner
Firegear Paver-CP-MT Block & Paver Control Panel for MT Burner
Best for: Block-built gas fire features that need a dedicated control panel.
This is a control panel rather than a fire ring, so it suits builders who are installing a gas burner inside a block or paver surround. The panel is designed to be integrated into the block structure, making it a useful component for a gas version of a retaining wall block fire pit.
Key specs:
- Designed as a control panel for an MT burner (per the listing name)
- Intended for block and paver installations
Pros:
- Purpose-built for block and paver gas installations
- Keeps controls accessible while the burner sits inside the surround
- Useful for owners who want a gas option without a propane tank nearby
Cons:
- Only useful if you are also installing a compatible gas burner
- Gas work should be handled by a qualified installer
Bottom line: Pick this if you are building a gas fire feature from retaining wall blocks and need a control panel designed for that setup.
Buying Guide
Insert size and block opening
Measure the inside of your block ring before buying an insert. Most retaining wall blocks are sold in standard lengths, so plan the wall layout first and choose an insert that leaves a safe gap of at least 12 inches between the flames and any block edge. A 24-inch insert suits a compact layout, while a 36-inch insert needs a larger, level base.
Good picks for this: Breeo Zentro Fire Pit Insert, Blue Sky Outdoor Living 36″ Square Smokeless Fire Ring Insert
Material and heat resistance
Choose an insert made from steel or stainless steel with a finish designed for high heat. Powder-coated steel and stainless steel both perform well, though stainless may discolor with heat over time. Avoid thin, unrated metals that can warp.
Good picks for this: Breeo Zentro Fire Pit Insert, Blue Sky Outdoor Living 36″ Square Smokeless Fire Ring Insert
Wood-burning or gas use
Decide early whether you want a wood fire or a gas fire. A wood-burning insert with a smokeless design suits a traditional fire ring. A gas build needs a burner and a control panel, and the block structure must leave room for gas lines and access. Gas installations should follow manufacturer instructions and local codes.
Good picks for this: Firegear Paver-CP-MT Block and Paver Control Panel for MT Burner
Block stability and base preparation
Retaining wall blocks need a compacted, level base. Excavate for a gravel base of roughly 4 inches, compact it, and set the first course level. Use a construction adhesive or interlocking lip on each course for stability. Check level after every two courses so the insert sits flat.
Good picks for this: Blue Sky Outdoor Living 36″ Square Smokeless Fire Ring Insert, Breeo Zentro Fire Pit Insert
Clearance and placement
Place the fire pit at least 10 feet from the house, deck railings, fences and overhanging branches, and check your local fire rules for any stricter limits. Keep the area clear of dry leaves and furniture. Ensure the sitting area has a clear path for exit and that children and pets stay back from the flames.
Good picks for this: Breeo Zentro Fire Pit Insert, Blue Sky Outdoor Living 36″ Square Smokeless Fire Ring Insert
Durability and weather exposure
Blocks and inserts both face freeze-thaw cycles, rain and heat expansion. Choose a fully rated block product, seal the top course if recommended, and use a lid or cover when the fire pit is not in use. Stainless steel and powder-coated steel each resist weathering differently, so check care notes before buying.
Good picks for this: Breeo Zentro Fire Pit Insert, Firegear Paver-CP-MT Block and Paver Control Panel for MT Burner
Care and maintenance
Remove ash after each use once it has fully cooled. Brush the insert with a non-abrasive tool, inspect block joints each season for shifting, and replace any cracked blocks promptly. For gas systems, have a qualified technician inspect connections and controls at least once a year.
Good picks for this: Breeo Zentro Fire Pit Insert, Firegear Paver-CP-MT Block and Paver Control Panel for MT Burner
FAQ
Can I use any retaining wall block for a fire pit?
Not every block is suitable. Choose concrete blocks rated for outdoor use and avoid hollow blocks that can trap moisture or crack from heat. Check the manufacturer’s guidance on heat exposure before building around a fire.
How tall should the block wall be?
Most block fire pits are built two to four courses high. This height is usually enough to keep embers contained and provide a comfortable seating level. Taller walls need more careful base preparation and may complicate access.
Do I need a gravel base under the blocks?
Yes. A compacted gravel base of about 4 inches helps drainage and keeps the first course level. Without it, blocks can shift and crack over time.
Is a smokeless insert worth it for a block fire pit?
A double-wall smokeless design can reduce visible smoke compared with a basic open ring, though it does not eliminate smoke entirely. Dry, seasoned wood and good airflow matter as much as the insert design.
How far should a block fire pit be from the house?
A common guideline is at least 10 feet from structures, fences and overhanging branches, but local fire codes and HOA rules may be stricter. Check your local requirements before building.
Can I build a gas fire pit with retaining wall blocks?
Yes, but gas installations involve fuel lines, burners and controls that must meet local codes. Hire a licensed professional for gas work and follow the burner manufacturer’s installation instructions exactly.
Conclusion
For a large, generous fire ring, the Blue Sky Outdoor Living 36″ Square Smokeless Fire Ring Insert offers the most room and suits entertaining groups best, provided you have the space for a wider block base. For compact patios and smaller yards, the Breeo Zentro Fire Pit Insert, Stainless Steel, Square 24 in with Lid is the more practical match, with its lid and stainless finish. If you are building a gas-fueled block feature, the Firegear Paver-CP-MT Block and Paver Control Panel for MT Burner fills a specific role, though it works only alongside a compatible burner and professional installation. Measure your space, plan the block layout first, and choose the insert that fits the opening and your fuel preference.
Sources
- Outdoor fire safety guidance and fire prevention resources (usfa.fema.gov)
- Codes and standards for outdoor fires and fuel-gas appliances (nfpa.org)
- Consumer product safety information on outdoor heating and fire hazards (cpsc.gov)
Related reading
- Fire Pit Using Cinder Blocks: 3 Best Picks for Backyards (2026)
- Fire Pit Using Propane Tank: 5 Best Picks for Backyards in 2026
- Fire Pit Using Pavers: A Step-by-Step Guide to a Safe Backyard Base
- Concrete Blocks for Fire Pit: A Step-by-Step Build Guide for Beginners
- 6 Best Fire Pits with Cement Blocks for Backyards (2026)
About Colin Foster
Colin Foster is part of our editorial team and reviews and edits our backyard living & play guides, checking product details against manufacturer specifications and owner feedback.
