Choosing an air compressor can feel like deciding between two different tools: one is a 3-phase electric unit built to push large volumes of air, the other is a gas engine that stores high pressure in a 40-gallon tank. Your grid connection, your workspace, and the kind of air tools you run will settle this matchup.
Quick Verdict
If you have 230V 3-phase power and need steady high-volume air for extended work, the 3 Phase 10HP Rotary Screw Air Compressor is the stronger pick. If you need to move around a job site, work off-grid, or want higher pressure in a tank, the AllMetal 40 Gal 9HP Gas Air Compressor wins. The gas model is also the more affordable at $2,699, while the rotary screw comes in at $3,099-a roughly $400 spread.
Side-by-Side Comparison
| Spec | 3 Phase 10HP Rotary Screw | AllMetal 40 Gal 9HP Gas |
|---|---|---|
| Price | $3,099 | $2,699 |
| Power Source | 230V 3-phase electric | 9HP gasoline engine |
| Max Pressure | 125 PSI | 175 PSI |
| Airflow | 34 CFM | 14.5-20.6 CFM |
Where Each Compressor Wins
- 3 Phase 10HP Rotary Screw wins if you have 230V 3-phase service and you care more about air volume than pressure. Its 34 CFM at 125 PSI makes it a better fit for continuous-duty tools in a fixed shop.
- AllMetal 40 Gal 9HP Gas wins if you need compressed air where there is no electrical service. Its 9HP engine runs on gasoline, and the 40-gallon ASME-certified tank can hold 175 PSI for high-pressure tasks.
3 Phase 10HP Rotary Screw Air Compressor
Choose this unit if your shop already has 230V three-phase power and your tools eat air quickly. The 10HP rotary screw element moves 34 CFM at 125 PSI, which gives you a steady, high-volume supply for continuous work. The package includes a user-friendly controller, oil-air separator, and acoustic insulation, supporting the industrial-grade positioning. The big caveat is the power requirement: you need that 3-phase service. A standard household outlet won't drive it. You also have to work within the 125 PSI ceiling, so it is not the pick for tools that depend on more pressure. If high air volume is your bottleneck, this compressor is designed to keep up.
AllMetal 40 Gal 9HP Gas Air Compressor
Take this compressor when the job moves away from electrical outlets. The AllMetal runs on a Loncin 9HP 4-stroke gasoline engine, so it works on farms, worksites, and other locations without grid power. Its 40-gallon ASME-certified steel tank stores air up to 175 PSI, and the 80% duty-cycle rating supports repeated heavy use. A flow rate of 14.5-20.6 CFM means it is better suited to high-pressure tasks than to constant high-volume demands. The title calls it portable, and the 250-lb weight is a practical consideration for moving it between sites. If your priority is pressure and independence from the grid, this gas-powered tank delivers.
Final Choice by Use Case
- Need a fixed, always-ready source of high airflow and you have 230V 3-phase power: choose the 3 Phase 10HP Rotary Screw Air Compressor.
- Need compressed air where there's no electrical service: choose the AllMetal 40 Gal 9HP Gas Air Compressor.
- Need up to 175 PSI for high-pressure applications: the gas compressor is the better match.
- Need maximum air volume for continuous tools: the rotary screw's 34 CFM is the stronger output.
