Cooking with small wood becomes much easier when the fuel pile is sorted before the match is struck. For the Hillrein Zhengtu, cut dry wood to roughly 10 cm, then make two loose groups: lighter pieces that catch quickly and more substantial pieces that can carry the meal. The length stays convenient for the chamber; the job of each piece changes.
This is a small preparation habit, but it prevents a familiar problem. A cook lights a few scraps, reaches for the nearest chunky piece too soon, and watches the young flame disappear under a smoky refill. The stove is not short of fan power. The first fire simply has not made enough heat yet.
Cooking with small wood starts with two fuel jobs
The startup group should contain the driest, easiest-to-light pieces in the pile. Arrange them with breathing room rather than packing the chamber full. Use low to medium fan support while the flame establishes itself. The aim is to warm the inner chamber, not to build the entire dinner fire in the first minute.
The cooking group can contain the more substantial short pieces. They should still be dry and fit comfortably through the feed opening. Once the first load is burning on its own and the chamber is hot, these pieces give the fire more staying power under a wok, pan, or pot.
Why the hot chamber changes the refill
Zhengtu is a fan-assisted wood gasifier stove. As the chamber heats, wood releases combustible gas, and the annular oxygen intake helps burn much of that gas instead of letting it leave as visible smoke. That process works better after temperature and airflow have stabilized.
A heavier piece added to a cold, weak flame absorbs heat while it begins to dry and release gas. Added to an established hot chamber, the same piece catches more cleanly. Startup and refueling can still produce visible smoke, especially with damp fuel or a large addition, so “low-smoke” should always be understood as a stable operating condition rather than a promise of zero smoke.
Match the cooking pile to the dish
For stir-fry or wok cooking, let the chamber become fully hot, then build a fuller working load from the cooking pile. Increase the fan gradually toward about 80%. That is usually the practical high-heat sweet spot: strong recovery under the pan without racing through wood as quickly as a continuous 100% setting.
For soup, porridge, or a slow finish, the cooking pile should become deliberately small. About 20% fan with one to two short dry pieces is often enough after the pot is hot. Keep the next piece ready and add it before the fire collapses, rather than dropping in a handful after the simmer has already stopped.
Use the pot to judge the next piece
Do not choose fuel only by flame height. On the Zhengtu, more fan can make the visible flame look lower while useful heat under the cookware becomes stronger. Listen to the oil, watch the boil, and notice how quickly the pan recovers after food goes in.
If a healthy ember bed remains and the boil only needs a small lift, try a modest fan increase before adding wood. If airflow is steady but the fuel bed is clearly thinning, add one suitable short piece. Changing one thing at a time keeps the response readable and prevents needless wood use.
A five-minute fuel routine before dinner
- Use dry wood and cut the pieces to roughly 10 cm.
- Set aside the easiest-catching pieces for startup.
- Keep more substantial short pieces for the established cooking fire.
- Leave air space in the first load and increase the fan gradually.
- Move to the cooking pile only after the chamber is hot.
In suitable steady use, the Zhengtu can consume less than about 1 kg, or 2 jin, of dry wood per hour. That is not a fixed laboratory guarantee: fuel dryness, wind, cookware, fan setting, and the food all matter. Sorting the pile helps because it gives each piece a clear job instead of asking every stick to work at every stage.
The Hillrein Zhengtu stove is built for real meals, not only a quick flame demonstration. Use it outdoors or in a properly ventilated, local-code-compliant setting. With fuel prepared first, the fire feels less like something to rescue and more like another cooking control.