How Pellet Grills Make Smoke, and Why It Tastes Lighter

Hands holding a stainless steel bowl filled with pet food pellets, captured outdoors with a soft focus background.

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A pellet grill is a controlled, small fire fed by an auger, and that design explains both its convenience and its reputation for milder smoke. This article draws on Traeger’s Select Pro owner’s manual, the Pit Boss 820 manual, Weber’s Searwood guidance, AmazingRibs.com, and the Pellet Fuels Institute (PFI) for what “food-grade” pellets do and do not mean.

How the Smoke Is Made

AmazingRibs describes an auger that pushes pellets from the hopper into a burn pot, roughly the size of a beer can cut in half, where a glowing igniter rod lights them and a fan feeds the fire. A deflector plate over the pot spreads the heat under the cooking surface, so the cooker works like a wood-fired convection oven. On start-up, Traeger’s manual says whitish-gray smoke appears in about two minutes as the pellets ignite. Traeger’s non-connected grill instructions say the thick white smoke should turn thin and slightly blue once the fire is established, after about 15 minutes.

What the Smoke Setting Means

Traeger’s manual says the SMOKE setting is for smoking and adding smoke flavor, and can also hold food at approximately 180-200°F (82-93°C). AmazingRibs reports one manufacturer putting Smoke at about 160°F (71°C), and says this varies with ambient temperature, humidity and fuel quality. It puts MAK’s Smoke setting at about 175°F (79°C), where MAK’s Bruce Bjorkman says the cooker uses about half a pound of pellets an hour. Weber’s Searwood guide gives its SmokeBoost mode as 82-95°C (180-203°F), depending on ambient conditions, and suggests using it at the start of a cook, then switching to a set temperature of 105-135°C (221-275°F) after 2 to 4 hours.

So “smoke” is a feeding pattern, not a fixed temperature. On the Pit Boss 820 the auger runs 18 seconds, then pauses. The pause is set by the “P” setting, from 55 seconds at P0 to 150 seconds at P7, with P4 the factory default. Pit Boss says raising the number lowers the temperature and gives more smoke flavor, but going too high can put the fire out, and going too low overfeeds pellets and can cause creosote or incomplete combustion. AmazingRibs describes a similar Ortech controller (15 seconds on; off time from 45 to 165 seconds across P0 to P15) and sums it up: low heat means more smoke, high heat less.

Why Pellet Smoke Tastes Lighter

AmazingRibs’ explanation is combustion. Pellets carry none of the fillers found in briquettes, so they burn almost completely, and the hotter the fire, the less smoke. It says that at top settings there is little smoke, while below 250°F (121°C) the smoke is plentiful but mild, and that you can hardly oversmoke with pellets. The same page says a minority of owners find the flavor too mild.

AmazingRibs’ science advisor Prof. Greg Blonder adds a surface argument: smoke sticks to cool, wet surfaces, and meat warms and dries over a few hours. His tips are a strong wood such as hickory or mesquite, starting with cold meat, and keeping the surface moist with a mop or spritz. Weber’s Searwood has a dedicated SmokeBoost mode for the start of a cook.

What Is in the Pellets

Traeger describes its pellets as made from 100% natural, food-grade hardwood, rated at 8,500 BTU per pound with 2% ash content in the manual. AmazingRibs gives the same 8,500 BTU per pound and says 10 pounds of pellets make about half a cup of ash. It describes cooking pellets as compressed sawdust with no glue, and says most are a blend of oak and a flavor wood because makers say pure varietal woods are too strong. A 2018 Biomass Magazine column by Chris Wiberg, reposted by pellet maker Bear Mountain, notes that opinions differ on what a pellet should be: a mesquite pellet may include a share of other woods for burn and flavor, and some products use flavoring rather than a specific wood.

On heating pellets, AmazingRibs says heater pellets often contain softwoods such as pine and can contain treated lumber and other contaminants. Traeger’s manual says never to use heating fuel pellets because of potential hazardous contaminants and additives. Weber’s Searwood guide simply directs you to fill the hopper with Weber All Natural Hardwood Pellets.

“Food-grade” is a label, not a certification. Wiberg wrote in 2018 that he knew of no published standards or other guidance for making and using barbecue pellets, and that PFI had formed a BBQ pellet caucus. PFI’s barbecue page says its members produce wood pellets specifically formulated for grilling and smoking, but does not describe a standard. Its Standards Program FAQ describes specifications for residential and commercial grade pellet fuel. We could not confirm whether a barbecue pellet standard has been published since.

Safety Notes From the Manual

Traeger’s manual says the grill is for outdoor use only, warns that carbon monoxide is colorless and odorless, says to store pellets dry and away from heat-producing appliances, and never to put water into the firepot, since it will jam the auger.

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