Why Oxyhydrogen Is Safe by Design
Oxyhydrogen safety in a vehicle system comes from engineering, not from the chemistry being different. HydroHub™ PEM units generate gas on demand, store none of it, and place two independent flashback barriers — a sealed water layer and a dry-type flame arrestor with a one-way check valve — between the engine intake and the generator.
Hydrogen and Oxygen Together
HydroHub™ PEM units deliver a combined hydrogen and oxygen (oxyhydrogen) stream to the engine's air intake. Hydrogen accelerates flame speed and improves fuel burn completeness; oxygen enrichment supports more complete combustion. Together they produce a more efficient burn than hydrogen injection alone.
Yes, Hydrogen–Oxygen Mixtures Are Explosive
A hydrogen and oxygen mixture is explosive under the right conditions of confinement, concentration and ignition. That is a real property of the gas and we do not downplay it. Safety in a vehicle system therefore comes from the engineering around the gas: the mixture is never stored, never accumulated, and never left with an unobstructed path back to the generator.
| Layer | Role | How it works |
|---|---|---|
| Water-seal flashback prevention | Primary | Gas passes through a sealed water layer before reaching the intake. Any reverse flame is extinguished in the water before it can travel back to the generator. |
| Dry-type flame arrestor with one-way check valve | Secondary | A porous metal fire-stopping structure blocks flame transmission, and the integrated one-way check valve prevents air backflow toward the unit. |
| No storage, no accumulation | System design | Output is at atmospheric or micro-positive pressure. There is no tank and no buffer vessel: gas is generated and consumed in real time, with automatic pressure relief. |
This dual-arrestor, no-storage design is the standard industry configuration for vehicle HHO systems. It is not bespoke, experimental or unproven.
Manufacturing Certification
CE and RoHS certified, manufactured under ISO 9001 quality management.
These certifications relate to product compliance and to the quality-management system in place at the manufacturing facility. They are stated here as a factual matter and are separate from the flashback-safety engineering described above — they are not presented as validation of that engineering. Consistent with our standard practice, our manufacturing partner is not named.
What This Safety Case Covers
The safety case on this page applies to the small-scale, on-demand vehicle HHO system as engineered in the HydroHub™ range: low instantaneous gas volumes, no storage, and the dual-arrestor arrangement described above.
Larger industrial-scale combustion-air applications involve different gas volumes and different plant configurations, and would require their own scale-appropriate engineering and safety assessment. That is a separate question from the vehicle-kit safety case above, and this page makes no claims about it.
Questions.
Is oxyhydrogen explosive?
- A hydrogen and oxygen mixture is explosive under the right conditions of confinement, concentration and ignition. That is why the system is engineered so those conditions are not created: gas is never stored or accumulated, and two independent arrestor layers sit between the intake and the generator.
What stops a flashback from reaching the generator?
- Two layers in series. The primary layer is a sealed water column that extinguishes a reverse flame. The secondary layer is a dry-type porous metal flame arrestor combined with a one-way check valve that also blocks air backflow.
Is any hydrogen stored on board?
- No. There is no tank and no buffer vessel. Gas is produced on demand at atmospheric or micro-positive pressure and consumed immediately, with automatic pressure relief.
Is this arrangement unusual?
- No. A dual-arrestor, no-storage configuration is the standard industry arrangement for vehicle HHO systems. It is not bespoke or unproven engineering.
Does this page cover industrial-scale combustion-air systems?
- No. This safety case applies to the small-scale, on-demand vehicle system as engineered in the HydroHub™ range. Larger industrial-scale combustion-air applications involve different gas volumes and require their own scale-appropriate engineering and safety assessment.