Pro Leaf CO2 Burner — LPG CO2 Generator for Large Sealed Grow Rooms
Best for: Serious growers with sealed rooms larger than 10x10ft who want faster growth and bigger yields without the running costs of bottled CO2
Our thoughts
If you've got a proper sealed grow room and you're serious about yield, a CO2 burner is the move. Pro Leaf delivers solid output at a fraction of what you'd spend on refillable CO2 cylinders long-term. The build quality is straightforward, the safety features are there, and propane is cheap and readily available. One a lot of committed growers pick up once they've got the space to justify it.
The Pro Leaf CO2 Burner is a propane-powered CO2 generator designed for large sealed or semi-sealed grow rooms. It converts LPG into carbon dioxide on-demand, raising room levels to 800–1200ppm — the sweet spot for driving faster photosynthesis, heavier plant vigour, and yields up to 20–30% higher than ambient CO2 levels. Available in 4kW and 10kW models, it's built with electronic ignition, stainless steel construction, and safety features that mean you can leave it running without babysitting it.
How it compares
CO2 burners sit in a different category to bottled CO2 systems. Here's the practical reality:
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Burners vs. tanks: Burners are cheaper to run long-term. Propane refills cost a fraction of CO2 cylinder refills and are widely available locally
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Heat trade-off: Burners produce heat and moisture (combustion byproduct), which matters if your room runs warm or you're in a small tent. Larger sealed rooms handle this easily
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Output control: Pro Leaf lets you dial in exactly what you need — 4-burner or 10-burner, with adjustable output via brass caps or selector switches
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Vs. premium brands: Matches Autopilot and Titan Controls on build quality and safety, significantly cheaper upfront
Usage guidance
Room size matching
4kW model suits grow spaces up to 90m². 10kW model handles up to 220m². Measure your room volume and ensure it's properly sealed or the CO2 will just vent straight out.
Installation basics
Mount on the floor with included metal feet or suspend from ceiling with hanging hardware. Position at least 18–24 inches away from walls and flammable materials. Place an air circulator fan next to the unit to push CO2 evenly throughout the room. Keep it away from exhaust fans — if your extraction is pulling air past the burner, the CO2 goes straight out and you're wasting propane.
Automated control (recommended)
Pair with a Pro Leaf CO2 Controller (sold separately) for hands-off operation. The controller monitors room CO2, fires the burner when levels drop, and cuts it off once you hit your target ppm. No guesswork, no manual tweaking.
Manual operation
Can be run standalone, but you'll need to manually turn it on and off. Less convenient for sealed rooms where you want consistent levels.
Propane supply
Runs on bottled LPG via the included gas regulator and hose. Propane is cheap, available at most garden centres and fuel suppliers, and refills are quick. One bottle lasts weeks depending on burner usage and room size.
Technical specifications
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Available models: 4-burner (4kW) and 10-burner (10kW)
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CO2 output: 4kW model produces approximately 4,000 watts; 10kW model approximately 10,000 watts
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Coverage: 4kW ideal for rooms up to 90m² (roughly 300 sq ft); 10kW for up to 220m² (roughly 750 sq ft)
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Construction: Stainless steel body with brass burners and chrome-lined tips
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Ignition: Electronic ignition with integrated pilot flame and flame safety cut-out
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Safety features: Solenoid valve restricts gas if burners don't ignite; tip-over switch cuts power if unit is not upright; CE certified
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Included components: Gas regulator, 3.66m hose, power adapter, hanging hardware, metal feet. 4kW includes 2 brass caps; 10kW includes selector switches for 2, 5, 7, or all 10 burner operation
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Fuel: Bottled propane (LPG)
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Power: Mains electric for ignition and controls
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Internal design: V-shaped chamber for uniform CO2 dispersal
Who this is for
- Growers with sealed rooms larger than 10x10ft who want to optimise yield without premium running costs
- Experienced growers moving from bottled CO2 to reduce long-term expenses
- Anyone running multiple lights or rooms where CO2 enrichment makes economic sense
- Growers willing to manage heat and ventilation — if your room runs hot, a burner adds thermal load
- Operators with reliable propane access and the space to install proper safety clearance
Our take
A CO2 burner only makes sense if you've got the room size and the sealed environment to make it work. If you fit that box, the Pro Leaf delivers real value. It's built properly, runs reliably, and costs a fraction of what you'd spend feeding bottled CO2 cylinders year after year. Pair it with a controller and you've got a professional setup that works quietly in the background.
If you're serious about yield and you've got a proper sealed space, worth picking up while clearance stock lasts. One of the best long-term investments larger growers make.
