Yong Heng Yong Heng Smart Digital (auto-stop)
Specifications
- Max pressure
- 4,500 psi (300 bar)
- Cooling
- water via external bucket and pump
- Moisture handling
- two water-oil separators plus supplied cyclone separator
- Auto-stop
- Yes
- Duty cycle
- 30 min continuous guidance
- Noise
- 78 dB
- Vessel guidance
- Same pattern as classic with preset-and-walk-away filling
- Also sold as
- YH04SD, LCD Display auto-stop version
Estimated fill times
| Vessel | 0 → 250 bar | 200 → 300 bar |
|---|---|---|
| gun cylinder 0.3L | 2.1 min | 0.8 min |
| 1L bottle | 6.9 min | 2.7 min |
| 2L bottle | 13.7 min | 5.5 min |
| 3L bottle | 20.6 min | 8.2 min |
| 6.8L (74ci) tank | 46.7 min | 18.7 min |
| 9L (97ci) tank | 61.9 min | 24.7 min |
All values estimated from stated manufacturer or reviewer benchmarks (2 benchmarks); treat as run-time, not wall-time, past the unit's duty-cycle guidance.
Where to buy
Prices captured 2026-07-06; follow the link for current pricing and stock.
About Yong Heng
Yong Heng is the compressor that made home tank filling affordable, and it remains the reference unit for the entire budget tier. The pattern is consistent across its many labels: a 1.8 kW two-stage, splash-lubricated, water-cooled machine that needs a bucket, a pump, and an attentive owner, and in exchange fills a 6.8L bottle to 300 bar in roughly half an hour. It demands oil changes, cooling discipline, and an external moisture filter, and treated that way it has filled tanks for years in thousands of garages. Treated casually, it fails, which is the trade at this price.
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Open my locker →Specifications come from manufacturer pages and named retailer listings; blanks mean a value wasn't published, not that it's zero. Fill-time figures are derived estimates, not lab measurements. Always follow the manufacturer's fill and duty-cycle guidance.