Looking for a HYDI alternative?
HYDI is a long-established South Australian manufacturer of hydrogen-on-demand systems, with independent third-party testing and named commercial customers behind it. Buyers who look at alternatives are usually weighing fit and purchase path rather than questioning that record: budget against an approximate A$18,000 starting price, and a preference for seeing every SKU's price up front instead of engaging first. This page sets out where HydroHub differs.
Trademark notice. HYDI is a trademark of its respective owner. This is an independent comparison published by HydroHub™ (YBG Group International Pty Ltd). HydroHub™ is not affiliated with, authorised by, sponsored by or endorsed by HYDI. Statements about HYDI are summarised from their own public material at hydi.com.au and may change — verify at source before making a purchase decision.
What is a good alternative to HYDI?
HydroHub™ PEM hydrogen injection addresses the same intake-side combustion-efficiency objective as HYDI's hydrogen-on-demand systems, using a solid polymer proton-exchange membrane and deionised water. Gas purity is published as a specification at 99.991% combined H₂/O₂, sizing follows engine displacement across five SKUs from 1.0 L to 16.0 L, and every SKU carries a firm published price — US$1,975 through A$6,050 — rather than a starting figure, so a single unit can be bought and trialled without a quote process. HydroHub is operated by YBG Group International Pty Ltd and is not affiliated with HYDI.
- PEM solid-polymer membrane — deionised water only, no caustic KOH electrolyte
- 99.991% combined H₂/O₂ purity, no electrolyte carry-over into the intake
- Sized by engine displacement: 1.0 L through 16.0 L across five SKUs
- Published pricing and direct purchase — no register-interest gate
- Reversible intake-side fitment, no ECU or fuel-system modification
- Maintenance: deionised water top-up plus resin filter every 6–9 months
- Cell type
- PEM membrane
- Gas purity
- 99.991% H₂/O₂
- Electrolyte
- None (pure water)
- Range
- 1.0 L – 16.0 L
HydroHub™ PEM compared with HYDI.
| Criterion | HydroHub™ (PEM) | HYDI (hydrogen on demand) |
|---|---|---|
| Electrolysis technology | PEM solid-polymer proton-exchange membrane, deionised water only | Hydrogen-on-demand electrolysis using their own cell design, distilled water, no additives per their published material |
| Gas purity into intake | 99.991% combined H₂/O₂, stated as a specification | Purity not published as a headline specification; no stored hydrogen, generated only while the engine runs |
| Published pricing | Firm published prices for every SKU in the standard range, US$1,975 through A$6,050, purchasable online | An approximate starting price of around A$18,000 per unit is disclosed on their applications page; unit-by-unit pricing follows an ROI calculator and personalised quote |
| Purchase path | Direct buy-now checkout, single unit, no enquiry step, DDP worldwide delivery | Consultative: ROI calculator leading to a personalised quote from an established manufacturer |
| Sizing basis | Engine displacement band across the whole range, 1.0 L to 16.0 L | Selection by vehicle, engine and application category with vendor guidance |
| Trial approach | Buy a single displacement-matched unit and run a published baseline-versus-fitted protocol before any fleet decision | Independent third-party testing and named commercial customer case studies published by the vendor |
| Third-party validation | Peer-reviewed literature cited with DOIs; no university testing of our own hardware commissioned yet | Independent university testing plus named commercial customers — a credible validation record we do not currently match |
| Consumables | Deionised water top-up plus a resin filter every 6–9 months | Distilled water, with vendor-specified servicing |
| Documentation | Public installation guide, warranty terms, sizing method and evidence review | Vendor documentation and case-study material, largely supplied on enquiry |
Competitor details are summarised from publicly available vendor material and the generally established characteristics of the electrolysis technology described. Specifications change — verify current details directly with the vendor before purchasing. Corrections are welcome via the contact page.
Six checks before you commit to either option.
Cell chemistry and on-site hazards
Ask whether the unit runs a caustic electrolyte (typically potassium hydroxide) or pure deionised water. Electrolyte systems add mixing, storage, spill and disposal obligations, and introduce electrolyte-mist carry-over risk on the intake side.
Sizing basis
A gas flow rate in litres per minute is only meaningful against an engine displacement and duty cycle. Ask which displacement band a unit is rated for, not just its peak output figure.
Commercial model
Published pricing, lead times and a defined warranty are straightforward to evaluate. Register-interest and enquiry-only models make total cost and delivery timing difficult to compare before committing.
Validation pathway
You should be able to buy a single unit, fit it to your own equipment and measure the result before any fleet-wide decision. Treat vendor-reported percentages as a hypothesis to test, never as a guarantee.
Emissions obligations
Particulate matter and visible smoke are commonly reported to fall with hydrogen enrichment, while oxides of nitrogen can rise where combustion temperature increases. If you hold an emissions obligation, account for that trade-off before fitment.
Serviceability and spares
Confirm what the consumable schedule is, what a replacement stack or filter costs, and how spares reach your location. Remote sites should confirm this before, not after, deployment.
Match the unit to displacement, not to a competitor model number.
| System | Engine displacement | Typical application |
|---|---|---|
| HydroHub™ A-450 | 1.0–1.8 L | Light vehicles, small portable gensets, auxiliary sets |
| HydroHub™ A-675 | 2.0–2.5 L | Larger utes, light trucks, small stationary gensets |
| HydroHub™ A-900 | 2.7–7.0 L | Medium trucks, agricultural tractors, mid-size gensets |
| HydroHub™ H-Power | Up to 7.0 L | Heavy-duty road transport, high-hour mobile gensets |
| HydroHub™ DH-Power | Up to 16.0 L | Prime movers, mining haul, marine, continuous-duty gensets |
Full sizing methodology is set out in sizing combined gas for internal combustion engines, and the technology difference is covered in PEM vs alkaline.
Settle the comparison with your own data.
- Choose one asset that runs a repeatable duty cycle and capture at least two weeks of baseline fuel data against a normalised output measure (L/100 km, or L/kWh for gensets).
- Record load, route or load factor, ambient conditions and fuel type — these dominate the result more than the device does.
- Fit the displacement-matched unit on the intake side and confirm water quality and filter condition at commissioning.
- Repeat the identical duty cycle for a matching period post-fitment.
- Compare normalised fuel figures, never total litres burned.
- Log visible smoke separately, and account for the NOx trade-off if you carry an emissions obligation.
Buy one, trial it yourself.
Published pricing and direct purchase mean you do not need a sales process to start. Buy a single displacement-matched unit, measure it on your own equipment, and scale only if the numbers hold.
HYDI comparison — questions.
Is HydroHub™ a credible alternative to HYDI?
- It is a different engineering and commercial approach to the same objective: introducing hydrogen and oxygen on the intake side to improve combustion efficiency. HydroHub uses PEM electrolysis with a solid polymer membrane and deionised water; HYDI uses its own hydrogen-on-demand cell running on distilled water. Both avoid stored hydrogen. The practical differences a buyer can check are gas purity as a published specification, published pricing across the whole range, displacement-based sizing, and a direct buy-now purchase path.
What does a HYDI system cost?
- HYDI discloses an approximate starting price of around A$18,000 per unit on their applications page, with specific quotes generated through their ROI calculator and enquiry process. HydroHub publishes a firm price for every SKU in the standard range instead of a starting figure — US$1,975 for the A-450 through to A$6,050 for the DH-Power — so the comparison of purchase cost can be made before any conversation.
Is HYDI's evidence legitimate?
- Yes, and it should be treated as such. HYDI publishes independent third-party testing and named commercial customers, which is a genuine trust marker earned over more than a decade of Australian operation. HydroHub has not commissioned equivalent university-level testing of its own hardware and says so plainly; our published evidence is peer-reviewed literature cited with DOIs plus a field-trial protocol you run yourself.
What efficiency improvement is realistic?
- HydroHub caps its published expectation at up to 15% combustion efficiency improvement. Independent literature on hydrogen-enriched diesel combustion reports a wide spread depending on engine, load and enrichment rate: steady high-load duty cycles sit at the upper end, light or highly variable loads at the lower end. Any percentage from any supplier should be treated as a hypothesis to verify on your own equipment.
How is the correct HydroHub unit selected?
- By engine displacement rather than by matching a competitor model number: A-450 for 1.0–1.8 L, A-675 for 2.0–2.5 L, A-900 for 2.7–7.0 L, H-Power up to 7.0 L in heavy-duty service and DH-Power up to 16.0 L for prime movers, mining haul, marine and continuous-duty generator sets.
Does fitment affect my engine warranty?
- The system is fitted on the intake side and is fully reversible, with no injector, fuel-system or ECU calibration change. Operators under an active OEM warranty should still confirm the position with their OEM or dealer before fitment and retain the installation record.
What about emissions?
- Reported effects differ by pollutant. Particulate matter and visible smoke are commonly reported to fall. Oxides of nitrogen can rise where peak combustion temperatures increase. That is a genuine trade-off, disclosed openly here, and it must be accounted for by any operator holding an emissions obligation.
How should the choice actually be settled?
- With data from your own equipment. Capture at least two weeks of baseline fuel consumption against a normalised output measure — litres per 100 km, or litres per kWh for generator sets — then fit the correctly sized unit and repeat the same duty cycle for a matching period. Compare normalised figures, not total fuel burned.
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No projected, typical or expected fuel-saving figure is published. Actual results vary materially with engine condition, duty cycle, load profile, fuel quality, installation and operating conditions. A controlled field evaluation on your own equipment, with baseline data captured before installation, is required before any commercial projection.