Autopilot Natural Gas CO2 Generators – 8 Burner 22,136 BTU 21.6 CuFt/Hr

The Autopilot Natural Gas CO2 Generator (8-Burner, APGN0800) produces 21.6 cubic feet of CO2 per hour at 22,136 BTU, covering grow spaces up to 28′ × 28′. It runs on standard natural gas, ignites via solid-state electronic ignition, and includes a tip-over safety shutoff — no pilot light required. This is a practical, hang-mounted CO2 source for mid-to-large indoor grow rooms where elevated CO2 levels measurably accelerate plant growth.

Autopilot Natural Gas CO2 Generator Specifications

Specification	Value
Model / SKU	APGN0800
Fuel Type	Natural Gas (low altitude)
Number of Burners	8
BTU Output	22,136 BTU
CO2 Output Rate	21.6 Cu Ft / Hr
Coverage Area	Up to 28′ × 28′ (784 sq ft)
Enclosure Material	Powder-coated steel
Burner Material	Precision manufactured brass
Ignition Type	Solid-state electronic ignition (no pilot light)
Safety Feature	Tip-over shutoff switch (engages at 30° ±5°; resets at ≤10°)
Error Indication	LED error indicator lights with shut-down warning
Mounting Method	Hanging / suspended (unrestricted airflow required through bottom)
Unit Weight	28 lb
Brand	Autopilot

Why Choose the Autopilot 8-Burner Natural Gas CO2 Generator

The APGN0800 is designed for growers who need a reliable, mid-to-large scale CO2 source without the overhead of compressed tank systems. Running on standard natural gas, it provides a continuous and consistent CO2 supply as long as the gas line is live — eliminating the need to monitor tank levels or schedule refill deliveries.

The solid-state electronic ignition module eliminates the need for a standing pilot light. Each cycle, the igniter fires the burners directly. This reduces wasted gas during off-periods and removes a common point of failure found in older ignition designs. The LED error indicator and shut-down warning let you know immediately if the unit stops operating correctly, rather than discovering the problem hours later during a grow check.

Safety is built into the mechanical design. The tip-over switch engages at 30° off-level and cuts the gas source if the unit shifts or falls during operation. It resets automatically once the unit is returned to within 10° of level — no manual reset required. The powder-coated steel enclosure resists moisture and rust in the humid conditions typical of indoor grow environments, and the precision brass burners are built to sustain repeated heat cycles without degrading.

For growers already using Autopilot environmental controllers, the APGN0800 integrates cleanly into that ecosystem — the Autopilot PX2 Advanced Lighting Controller and related Autopilot controllers are designed to pair with these CO2 generators for coordinated environmental management across lighting and gas cycles.

Best Uses for the Autopilot 8-Burner Natural Gas CO2 Generator

• Mid-to-large commercial grow rooms: The 8-burner configuration covers spaces up to 28′ × 28′ (784 sq ft), making it appropriate for serious hobbyist and small commercial operations that have outgrown smaller 4-burner units but don’t yet need the 10-burner model.
• Facilities with existing natural gas infrastructure: If your grow facility already runs natural gas lines for heating or other equipment, this generator connects directly to that supply. You avoid the logistics and recurring cost of propane or CO2 tank management.
• Grow rooms where continuous CO2 is practical: CO2 generators are most cost-effective when used in sealed or semi-sealed environments where the gas can accumulate to productive levels (typically 1,000–1,500 ppm). Well-sealed grow rooms with adequate return air circulation get the most from this unit.
• Operations with Autopilot environmental control systems: This generator is designed to pair with Autopilot’s CO2 controllers and environmental management hardware. If your facility already uses Autopilot controllers, the APGN0800 slots in without compatibility concerns.
• High-output vegetative and flowering stages: Plants actively consuming CO2 during rapid growth benefit most from the sustained output of a burner-style generator. CO2 supplementation at levels above ambient (approximately 400 ppm outdoor air) is most impactful during active photosynthesis under strong lighting.

Autopilot 8-Burner Natural Gas vs Liquid Propane CO2 Generators

Autopilot makes the same 8-burner CO2 generator in both natural gas (APGN0800) and liquid propane (APLP0800) configurations. The burner count, output rate, safety features, and physical enclosure are the same across both versions. The difference is purely in the fuel source and corresponding BTU rating — the natural gas version outputs 22,136 BTU at 21.6 Cu Ft/Hr of CO2, while the LP version runs at a different BTU range calibrated for propane combustion chemistry.

Choosing between them comes down to what fuel you have available on-site. Natural gas is piped in continuously and has no refill logistics, but requires a gas line connection. Propane is portable and can be used where no gas line exists, but requires tank management, delivery scheduling, and monitoring remaining tank levels. For permanent installations with gas service, the natural gas version is typically the lower-friction option. For temporary setups or facilities without gas lines, propane makes more practical sense.

Both models are also available in high-altitude versions for grows at elevation where lower atmospheric pressure affects combustion efficiency. Confirm which variant is appropriate for your installation location before ordering.

Compatibility

The APGN0800 connects to a standard natural gas supply line. It is a low-altitude model intended for installations at or near sea level — if your grow space is at significant elevation (generally 3,500 feet or above), Autopilot offers high-altitude variants calibrated for those conditions. Confirm altitude compatibility before purchasing.

The generator must be hung or suspended from above. It cannot be operated resting on a flat surface. Unrestricted airflow through the bottom of the unit is required for safe combustion and proper operation. The unit is rated at 28 lb, so your hanging hardware needs to be rated well above that with appropriate safety margin.

For CO2 level management, this generator is designed to be used with a CO2 controller that reads ambient CO2 concentration and cycles the generator on and off to maintain a target ppm setpoint. Autopilot’s environmental controllers are the intended pairing, and can coordinate CO2 generation with exhaust fan scheduling to prevent over-venting when the generator is active. Maintaining good air circulation and having clean intake air filtration helps ensure the combustion products disperse correctly through the grow space.

Both propane and natural gas generator models use the same physical mounting and controller interface, so if you switch fuel types in the future, the control system does not need to change.

Usage Guidelines

CO2 supplementation is effective only in enclosed spaces where CO2 levels can build above ambient. The APGN0800 is rated for spaces up to 28′ × 28′ at standard ceiling heights. In larger spaces, or rooms with higher ceilings, effective CO2 accumulation may require longer run times or additional units.

A CO2 controller paired with a calibrated sensor should govern the generator’s duty cycle. Common target ranges for indoor plant growth are 1,000–1,500 ppm during the lights-on period. Running CO2 enrichment during the dark cycle is generally not productive since photosynthesis — the process that consumes CO2 — is light-dependent.

Because the generator produces heat along with CO2, factor the added BTU load into your climate calculations. The 8-burner model runs at 22,136 BTU/hr when active. In environments where heat accumulation is already a concern, this affects how you schedule the generator relative to your cooling and exhaust systems.

The tip-over safety switch engages at 30° off vertical and shuts off the gas supply. If the unit triggers this switch during normal operation (not due to physical tipping), inspect the mounting hardware and verify the unit is hanging level. The switch disengages and allows re-ignition automatically once the unit is returned to within 10° of level.

Monitor the LED error indicator lights regularly. A shut-down warning indicates the unit has stopped operating; check the gas supply, verify the mounting is level, and inspect the igniter if the generator does not restart on its next scheduled cycle.

How to Install / Setup

1. Confirm your gas supply: Verify that a natural gas line with appropriate pressure and fitting is available at the installation location. This unit is a low-altitude model — confirm you are not at significant elevation before proceeding.
2. Install hanging hardware: The APGN0800 must be suspended from above. Use hanging hardware rated for well above 28 lb with an appropriate safety factor. Mount directly above the grow canopy if possible, as CO2 is heavier than air and will settle downward toward the plants.
3. Connect the gas line: Connect the natural gas supply to the inlet fitting on the generator. Follow local building codes and, where required, have the gas connection made by a licensed plumber or gas fitter. Verify there are no leaks at the connection before operating.
4. Confirm unrestricted airflow from the bottom: Do not hang the unit flush against a surface or inside an enclosure that blocks the bottom. The combustion airflow path must be open.
5. Connect to a CO2 controller: Wire the generator to an Autopilot CO2 controller or compatible environmental controller. Set your target CO2 setpoint (typically 1,000–1,500 ppm for most crops) and configure the controller to disable exhaust fans while the generator is running.
6. Test ignition: Power on the controller and trigger a short manual test cycle. Verify the solid-state igniter fires the burners and the flame is steady and even across all 8 burners. Check that the LED indicator shows normal operation.
7. Verify tip-over switch function: With the gas off, confirm the unit hangs level. The tip-over switch should not engage during normal hanging operation.
8. Monitor CO2 levels: After your first full operating cycle, verify that room CO2 levels are reaching your setpoint within a reasonable time. Adjust controller settings or check for air leaks if levels are not reaching target.

Sources & Further Reading