Kamado-style cookers (Big Green Egg, Kamado Joe, Primo, and the rest) are the most thermally efficient charcoal grills you can own. The ceramic body holds heat, the dome shape circulates smoke and convection, and the airflow control is precise enough to dial in 225°F or push past 700°F on the same fire. For tri tip, that flexibility is the whole point: you can sear hard, then drop the temp and finish slow, all without rebuilding the fire.
Fuel and Fire
Use lump charcoal, not briquettes. The lump's clean burn matches the kamado's airflow design; briquettes leave ash that clogs the bottom vent and can stall a cook. Light a small pile (about a third of the firebox) with a chimney or an electric starter. Once the lump is partially lit, close the dome and let the temperature climb to your target. Add 2 to 3 chunks of red oak, cherry, or pecan on top of the coals before the cook starts.
Two-Zone on a Kamado
Most kamados can run two-zone with a half-deflector (plate setter, heat shield) covering one side of the fire. The covered side becomes indirect; the uncovered side stays direct. Sear over the direct side, slide to indirect for the finish. If your kamado is small (Mini, Junior), skip the deflector and sear-then-coast: sear hard with the dome open, then close the dome and let the residual heat finish the cook.
The Cook
Bring the kamado to 550 to 600°F at the dome thermometer. Sear the tri tip fat-cap-up for 3 to 4 minutes per side over direct heat. Then close all but the bottom vent halfway and the top vent to a quarter. The temp will drop fast. Move the tri tip to the indirect side (or close the dome if you're sear-and-coasting). Hold 325 to 375°F until the internal hits 128 to 130°F. Usually 15 to 25 more minutes.
Worth Knowing About Smoke
Kamados produce thicker smoke than open grills because the dome traps it. That's a feature when you want bark and ring on a smoked cook, and a bug when you want pure beef flavor. For Santa Maria-style tri tip on a kamado, use less wood than you would on a kettle: one chunk, not three. The convection does the rest.