A pan of water in a smoker is one of barbecue’s most common habits and one of its most argued-over ones. Manufacturers, teachers and competition cooks give it different jobs, and some skip it entirely. This piece sets out what Weber’s Smokey Mountain owner’s guide, AmazingRibs.com, The Virtual Weber Bullet and MasterClass’s Aaron Franklin guide each claim, and where they part ways.
Job One: Holding the Temperature Down
This is the one job every source agrees on. Weber’s owner’s guide for the Smokey Mountain says the water in the smoker is used to keep the temperature low, and that you should check the level every 3 to 4 hours. Its troubleshooting table gives checking the water level as the cure when the temperature keeps climbing with the bottom vents closed.
AmazingRibs.com’s Meathead explains the physics. In a vertical smoker like the Smokey Mountain, where the water sits directly above the coals, he says the water can never rise above the boiling point, 212 degrees F (100 degrees C). In cookers where the pan sits alongside the coals, like a kettle, he says the water will likely not exceed 180 degrees F (about 82 degrees C, our conversion) even with the air at 225 degrees F (107 degrees C, our conversion), because evaporation cools it. He adds that water is slower to heat and cool than air, which smooths out swings, and that a pan between fire and food can block direct flame and even out hot spots.
Chris Allingham, who runs The Virtual Weber Bullet, puts it as “training wheels” for new owners: he says it is almost impossible to run that smoker above 275 degrees F (135 degrees C) while the pan is full of water. Weber Australia’s kettle guide likewise adds a drip pan of warm water to help regulate temperature.
Job Two: Humidity, and Here the Sources Split
MasterClass’s summary of Aaron Franklin’s advice says to put a pan with a few inches of warm water inside the smoker to add humidity, keeping the meat surface moist and tacky so smoke sticks better. Weber Australia also says its drip pan creates a humid environment, and Allingham says condensing vapor helps smoke stick.
Meathead lists the same sticky-surface idea among his reasons, but qualifies it. In cookers with a fire, he writes, so much air moves through the chamber that water vapor has little effect on humidity, though it varies with the design. He cites a reader who measured airflow of 268 cubic feet per minute at the exhaust stacks of an offset smoker at 250 degrees F (121 degrees C, our conversion). In electric smokers, where there is little air movement, he says a pan can add humidity. He also notes that an oil slick of drippings on the water stops it evaporating.
The Case Against the Pan
Competition cook Harry Soo, quoted by AmazingRibs.com, does not use water. He covers the pan with foil top and bottom and says dry heat lets bark form faster; once it sets he sprays with water, and later wraps in foil. Allingham lists costs of using water: refilling, softer poultry skin, more charcoal used, disposal of leftover water and grease, and burn risk. He adds that competition teams have made championship barbecue in the Weber Bullet with an empty, foil-lined pan, and that an empty pan is required for cooker temperatures of 325 to 375 degrees F (163 to 191 degrees C, our conversion), such as high-heat chicken.
Smaller Disagreements
- Hot or cold water. Meathead says to use hot water, which absorbs less heat and helps the cooker reach temperature faster, keeping cold water for a cooker that is running hot. Weber’s owner’s guide says to always use hot water when replenishing. Weber’s support page for the same smoker suggests adding cold water if temperatures get too high, and Allingham says cold water is fine in most cases, with hot for the coldest days.
- What goes in. Meathead and Allingham both advise plain water rather than beer, wine or juice, on the grounds that the flavor compounds make no noticeable impact.
- Drip pan versus water pan. Meathead separates the two: drip pans go under the food to catch juices and prevent flare-ups, while water pans go over the heat source.
Handling Hot Water Safely
Weber’s owner’s guide warns not to spill water into hot coals, because steam and ash could rise and cause serious injury or death. Allingham makes the same point about boiling water and steam, and recommends seating the pan securely before adding water.
So Should You Use One?
The sources do not give one answer. If your smoker runs hot, or you are learning it, Weber and Allingham point to water. If bark, crisp skin or hotter temperatures matter more, Soo and Allingham describe running dry. Whichever you choose, AmazingRibs.com advises a good thermometer and a cooking log for the Smokey Mountain, at least until you understand how it runs.
Keep reading
- Snake Method vs Minion Method for Slow Charcoal Cooks
- Do You Need to Soak Wood Chips? Chips, Chunks and Logs
- Seasoning a New Smoker: What Makers and Cooks Advise
- The Science of the BBQ Stall, Explained by Meathead and AmazingRibs.com
Sources
- Weber: Smokey Mountain Cooker Smoker Owner’s Guide (56001)
- Weber support: How to Light a Smokey Mountain Cooker
- Weber Australia: Kettle Setup, Low and Slow (Snake Method)
- AmazingRibs.com: How to Use Drip Pans and Water Pans
- AmazingRibs.com: Top Tips for the Weber Smokey Mountain (Harry Soo)
- The Virtual Weber Bullet: Using a Water Pan in Weber Smokers
- MasterClass: Aaron Franklin’s Top 7 Tips










