The Knob Does More Than You Think

Most people turn the dial on a fire pit table the same way they adjust a gas stove—casually, without much thought. But that single control knob is the visible end of a small chain of mechanical decisions that determines how hot your fire burns, how long your fuel lasts, and whether the flame looks like a campfire or a pilot light. Understanding what’s actually happening behind that knob makes you a better buyer and a more confident user.

A fire pit table with adjustable flame uses one of two fuel sources—propane or natural gas—and the mechanics of flame control differ slightly between them. Both systems rely on the same basic principle: gas flows from a supply source through a regulator, into a valve, and out through a burner. The flame height is controlled by how much gas you allow into the burner at any given moment. Turn the knob counterclockwise and you open the valve, increasing gas flow and raising the flame. Turn it clockwise and you restrict the flow, dropping the flame lower.

What makes this feel intuitive is that the relationship between knob position and flame height is roughly linear. A quarter turn from full open typically drops you to a mid-range flame. Another quarter turn gets you to a low, ambient glow. The precision varies by burner design and fuel pressure, but the general feel is consistent across most quality fire tables on the market in 2026.

The Regulator: The Invisible Workhorse

Before gas ever reaches the valve you’re turning, it passes through a pressure regulator—a component most owners never see and rarely think about until something goes wrong.

Propane tanks store gas at high pressure, typically well above what any fire pit burner is designed to handle. The regulator’s job is to step that pressure down to a usable, consistent level. Inside the regulator, a rubber diaphragm and spring work together: when outlet pressure rises too high, the diaphragm compresses the spring and partially closes the valve; when pressure drops, the diaphragm relaxes and lets more gas through. The result is a stable output pressure regardless of how full or empty the tank is.

For most propane fire tables, the regulator outputs around 11 inches of water column (roughly half a PSI)—the standard low-pressure range that allows a burner to produce a clean, controllable flame. High-output tables that push 50,000 BTUs or more often use a high-pressure adjustable regulator, which can range from 0 to 20 PSI. This is why two fire tables can look identical but behave very differently: the regulator spec matters as much as the burner size.

Natural gas systems work similarly, but the gas arrives at your home already regulated by the utility meter. The pressure is typically between 3.5 and 7 inches of water column at the appliance connection. Because natural gas has a lower energy density than propane, natural gas burners use larger orifices to compensate—which is why you cannot simply swap a propane fire table to natural gas without a proper conversion kit and, in most cases, a licensed gas technician.

One practical implication: if your fire table flame seems weaker than it should be, the regulator is often the first place to investigate. A faulty or undersized regulator can starve the burner of pressure, leaving you with a low, unsatisfying flame even when the tank is full.

Key Valves, Control Knobs, and What Each Does

The control knob on a fire pit table is usually attached to one of two types of valve systems, and knowing the difference helps you understand what you’re operating.

The first is a key valve (also called a ball valve), which is mounted into the table’s structure—often on the side panel—and accessed with a removable key. Turning the key counterclockwise opens the valve and allows gas to flow; clockwise closes it. The degree of turn directly controls how much gas reaches the burner, giving you fine-grained adjustment over flame height. Key valves are common in built-in natural gas installations and higher-end fire tables where the valve is positioned for easy reach without opening the table base.

The second is a knob-style adjustable regulator, where the control sits directly on top of the regulator near the propane tank. You’re literally adjusting the pressure output of the regulator itself when you turn this knob. It works, but it’s less convenient—you have to open the table base or access panel to make adjustments, which interrupts the experience.

Most well-designed fire tables solve this by separating the regulator (hidden inside the base near the tank) from the control knob (mounted on the exterior panel for easy access). The regulator maintains consistent baseline pressure; the exterior valve handles moment-to-moment flame adjustment. This two-component approach is what allows you to dial the flame from a roaring 50,000+ BTU output down to a quiet ambient glow without touching anything inside the table.

Some premium tables add a push-button electronic ignition, which uses a battery-powered spark to light the burner. You press the button while turning the knob to release gas, and the spark does the rest. Other tables, including the Oriflamme fire tables available at All Backyard Fun, use a match-lit system intentionally—push-button igniters can corrode or fail, and a long-handled lighter is a more durable, field-serviceable solution for a product meant to last decades.

BTUs, Flame Height, and What the Numbers Actually Mean

When a fire table is described as producing 50,000 BTUs or 90,000 BTUs, that number represents the maximum heat output—the rate at which the burner consumes fuel when the valve is fully open. It is not a fixed output. Every time you turn the control knob, you’re adjusting the effective BTU output up or down across that range.

This matters practically for two reasons. First, a higher BTU ceiling gives you more range. A table rated at 90,000 BTUs can produce a dramatic, heat-radiating fire at full output and still dial down to a gentle decorative flame at 20–30% open. A table rated at 30,000 BTUs has a narrower range—you can still adjust it, but the difference between high and low is less dramatic.

Second, BTU output directly affects fuel consumption. Running a fire table at full output on a 20-pound propane tank will typically last somewhere between 6 and 18 hours depending on the BTU rating. Drop the flame to a mid-range setting and you can extend that burn time considerably. Some tables—like the larger Oriflamme models that accommodate two standard propane tanks hidden inside the base—can run 20 to 35 hours at moderate settings, which means a full weekend of evening use without swapping tanks.

For natural gas installations, BTU output tends to run slightly higher than the equivalent propane setup because the larger orifices and lower pressure allow for a different combustion profile. The Oriflamme gas fire pit tables at All Backyard Fun, for example, produce up to 75,000 BTUs on propane and up to 90,000 BTUs on natural gas—a meaningful difference if maximum heat output is a priority.

Why Adjustability Matters Beyond Ambiance

The ability to control flame height is often marketed as an ambiance feature—and it is—but there are practical reasons it matters beyond aesthetics.

Wind compensation. On a breezy evening, a low flame can gutter and struggle. Bumping the output up slightly stabilizes the flame and keeps it burning cleanly. Without adjustability, you’d either have a weak, flickering fire or nothing at all.

Fuel efficiency. A fire table running at full output on a cool night in October makes sense. The same table running at full output on a warm July evening is just burning fuel unnecessarily. Being able to drop to 30–40% output while still maintaining a visible flame is a real-world benefit that adds up across a season.

Safety near combustibles. Most fire tables require a minimum clearance of 60 inches from the center of the burner to any combustible wall or material. But if your patio setup is close to a pergola or shade sail, running at a lower flame height reduces radiant heat output and gives you additional margin. Adjustability is part of responsible use, not just comfort.

Fuel type transitions. If you convert a propane fire table to natural gas (which requires a conversion kit and typically a licensed gas technician), the combustion characteristics change. An adjustable valve system lets you fine-tune the flame after conversion to match the new fuel’s pressure and flow profile.

If you’re shopping for a fire table and adjustable flame control is a priority, pay attention to where the control is located, not just whether it exists. A valve buried inside the base that requires you to open a panel every time you want to adjust the flame is technically adjustable—but it’s not convenient. Look for exterior-mounted controls, clear labeling, and a smooth turning action that gives you genuine incremental control rather than just on/off with a middle position.

What to Look For When Buying

A few things worth confirming before purchasing any fire pit table with adjustable flame:

Control knob location. Is it on the exterior panel, or inside the base near the tank? Exterior-mounted controls are significantly more user-friendly.

Regulator type and BTU ceiling. A high-pressure adjustable regulator paired with a large-diameter burner gives you the widest useful range. Confirm the BTU rating matches the burner size—an undersized regulator on a high-BTU burner will cap your output below the rated spec.

Fuel flexibility. Does the table support natural gas conversion? If you have a gas line on your patio or plan to add one, a table that ships propane-ready but includes a natural gas conversion kit (or has one available separately) gives you long-term flexibility.

Ignition system durability. Push-button electronic ignitions are convenient but can fail. Match-lit systems are simpler and more reliable over the long haul, especially in outdoor environments with moisture and temperature swings.

Burner design. Some burners concentrate flame in a central ring. Others—like the proprietary all-over flame burner used in Oriflamme tables—distribute flame across the entire burner tray, which produces a more visually dramatic fire and more even heat distribution across the table surface.

Adjustable flame control is table stakes in 2026—virtually every gas fire table has it. The meaningful differences come down to how well the system is engineered, how easy it is to use in practice, and how much range it actually gives you between a quiet glow and a full fire. Those details are worth asking about before you buy.