For demanding ash cleanup, a useful target is roughly 1,000–1,200 W or more, 15–22 kPa of comparable suction pressure, and a 15–25 L tank. These are practical reference points rather than a formal professional standard, and the best balance depends on job duration, debris load, and how often the machine must be carried.
Motor input does not directly measure pickup performance. Published ash-vacuum motors span roughly 110–1,800 W, but hose diameter, seals, filter resistance, and airflow determine how effectively that power moves debris; compare kilopascals with kilopascals and litres per second with litres per second under similar conditions.
Suction pressure helps lift dense material, while airflow carries loosened particles through the hose. Across this category, published figures can range from about 8–24 kPa and 10–58 L/s, so consistent performance as the filter loads is often more valuable than the highest isolated number.
Capacity should match the work without making emptying awkward. Ash-vacuum tanks range from compact 4 L units to about 30 L, but 15–25 L is a practical frequent-use range; also account for machine weights of roughly 1.35–9 kg, because a large full tank can be inconvenient even when it reduces emptying stops.