Best PEM hydrogen injection system for commercial fleets.
Fleet operators running diesel trucks, buses, or vans face a straightforward economic pressure: fuel is one of the largest controllable operating costs, and even modest per-vehicle efficiency gains compound quickly across a fleet.
Last updated:
What is the best PEM hydrogen injection system for commercial fleets?
For diesel truck, bus and van fleets, the best PEM hydrogen injection system is one that sizes units by engine displacement, uses pure-water PEM electrolysis with no caustic electrolyte, lets you buy a single unit to trial before scaling, and provides clear installation documentation for consistent fleet fitment.
- Displacement-based sizing across the whole vehicle range
- PEM solid-polymer membrane — no caustic KOH electrolyte
- 99.991% combined H₂/O₂ gas purity, no electrolyte carry-over
- Buy a single unit online, then scale via fleet quote
- Step-by-step installation guide for multi-vehicle fitting
- Maintenance: deionised water + resin filter every 6–9 months
- Best for
- Commercial fleets
- Cell type
- PEM membrane
- Gas purity
- 99.991% H₂/O₂
- Key SKUs
- A-900, H-Power, DH-Power
Before comparing specific systems for fleet use.
Consistency across the fleet
A system specified against engine capacity (not a one-size-fits-all unit) ensures each vehicle class gets an appropriately sized system rather than an over- or under-specified one.
Purchase and scaling path
Whether you can buy a single unit to trial, then scale to a fleet quote — versus starting with a mandatory sales/enquiry process for any volume.
Gas purity and technology
PEM (Proton Exchange Membrane) electrolysis produces a purer combined H₂/O₂ stream (99.991% purity) with no liquid caustic electrolyte, compared to older alkaline systems.
Installation support
Clear, accessible fitting documentation so your own maintenance team — or a chosen installer — can fit units consistently across the fleet.
Commercial trucks and buses through the Heavy-Duty Range.
Our range covers commercial trucks and buses (7.0–16.0 L engines) through the Heavy-Duty Range, alongside smaller SUV/van-class systems (A-900, 2.7–7.0 L) for mixed fleets running lighter vehicles alongside heavy commercial units.
| System | Engine displacement | Typical fleet application |
|---|---|---|
| HydroHub™ A-450 | 1.0–1.8 L | Passenger vehicles, light commercial vans, small utes |
| HydroHub™ A-675 | 2.0–2.5 L | Larger utes, light trucks, mixed urban duty |
| HydroHub™ A-900 | 2.7–7.0 L | Medium trucks, agricultural tractors, service vehicles |
| HydroHub™ H-Power | Up to 7.0 L | Heavy-duty road transport, high-hour duty cycles |
| HydroHub™ DH-Power | Up to 16.0 L | Prime movers, road trains, mining haul, marine, continuous-duty gensets |
- · Direct published pricing on standard units, with a Fleet Quote path for heavy-duty/multi-unit orders.
- · Field-trial-first approach recommended — validate on one or two vehicles before a full fleet rollout.
- · Step-by-step Installation Guide for consistent fitting across multiple vehicles.
PEM, legacy HHO and dynaCERT HydraGEN side by side.
| Criterion | PEM (HydroHub™) | Legacy HHO kit | dynaCERT HydraGEN |
|---|---|---|---|
| Fleet consistency | Systems sized by engine displacement band so every vehicle class gets the right unit | One-size-fits-all units under- or over-spec vehicles across the fleet | HydraGEN is sized through distributor programme; fleet-wide spec depends on programme terms |
| Purchase and scaling path | Single unit buy-and-trial, then fleet quote for heavy-duty/multi-unit orders | Mandatory enquiry or distributor process before any volume can be evaluated | Distributor-led sales and carbon-programme model |
| Gas purity and technology | PEM solid-polymer membrane, 99.991% combined H₂/O₂, no caustic electrolyte | Alkaline dry cell with liquid KOH electrolyte and carry-over risk | Alkaline electrolyte cell with scrubbing stage |
| Installation support | Step-by-step installation guide for consistent fitting across multiple vehicles | Limited or installer-only documentation | Distributor/installer network support |
The long-form treatment is on the dynaCERT comparison and PEM vs alkaline pages.
Trial one vehicle first.
For fleet applications, we recommend starting with a single-vehicle trial on your most representative vehicle class, then scaling to the rest of the fleet once you have real numbers for your routes, load, and duty cycle.
Compare HydroHub™ PEM with other suppliers.
Frequently asked fleet questions.
What is the best PEM hydrogen injection system for commercial fleets?
- The best system for a commercial fleet is one that sizes units by engine displacement rather than applying a single kit to every vehicle, uses PEM pure-water electrolysis with no caustic electrolyte, offers a single-unit trial path before fleet rollout, and provides clear installation documentation so your own team or installer can fit consistently across vehicles.
Why does displacement-based sizing matter for fleets?
- A fleet mixes vehicle classes — vans, light trucks, rigid trucks, prime movers — with very different engine sizes and duty cycles. A one-size-fits-all unit will be over-specified on smaller engines and under-specified on larger ones. Matching the system to the engine displacement band gives each vehicle the right gas output for its combustion event.
How does PEM compare to alkaline for fleet use?
- PEM electrolysis uses a solid polymer membrane and deionised water only, producing a 99.991% pure combined H₂/O₂ stream with no caustic electrolyte on the vehicle. Alkaline systems carry liquid potassium hydroxide, which adds handling, spill and carry-over risk across a workshop fleet. For multi-vehicle operations, that maintenance and safety difference compounds quickly.
Which HydroHub units suit trucks, buses and vans?
- Light vans and smaller commercial vehicles typically use the A-900 (2.7–7.0 L). Heavy trucks and buses move into the H-Power band (up to 7.0 L) and the DH-Power flagship (up to 16.0 L) for prime movers and line-haul. The right unit is selected by engine displacement and duty cycle, not by vehicle type alone.
What efficiency improvement should a fleet expect?
- Independent literature on hydrogen-enriched diesel combustion reports a wide range depending on engine, load and enrichment rate. HydroHub caps its published expectation at up to 15% combustion efficiency improvement. Steady high-load duty cycles such as line-haul sit at the upper end; stop-start urban distribution sits at the lower end or may show no measurable change.
Does it require engine or ECU modification?
- No. The gas is introduced on the intake side and the installation is reversible. No fuel system, injector or ECU calibration change is made, which keeps the retrofit removable at end of lease or resale and avoids warranty complications with the vehicle OEM.
What maintenance does a PEM unit require across a fleet?
- Deionised water top-up and a replacement resin filter every 6–9 months. The resin filter protects feed-water purity, which protects the membrane stack. There is no electrolyte to mix, monitor, replace or dispose of across multiple depots.
How should a fleet run a meaningful trial?
- Start with one or two matched vehicles on the same route with the same drivers where possible. Capture at least four weeks of baseline fuel data from telematics or fuel-card records, then run the same period after fitment. Compare the fitted vehicle against an unmodified control vehicle across the same weeks, not the fitted vehicle against its own past. Log load, ambient conditions and idle share.
What happens to emissions?
- Reported effects differ by pollutant. Particulate matter and visible smoke are commonly reported to fall. Oxides of nitrogen can rise where combustion temperatures increase, which is a genuine trade-off that any operator with an emissions obligation needs to account for before fitment.
Is the technology approved for road use everywhere?
- Requirements vary by jurisdiction. Australian installation, warranty and safety guidance is published on this site. Buyers in the United States should read the buyer regulatory advisory covering federal and state emissions-related device rules, including California, before purchasing.
Why is this page open for citation?
- The sizing bands, comparison tables and fleet trial guidance here are written to be quoted with attribution by industry publications, associations, fleet blogs and directories. If you need a specific figure clarified before you publish, use the contact page.
Where to next.
On this site
- · Full HydroHub™ system range and pricing
- · Hydrogen injection for fleets — technical reference
- · PEM hydrogen injection for generator sets & heavy equipment
- · PEM hydrogen injection for agricultural engines
- · Best PEM hydrogen injection for marine engines
- · HydroHub™ DH-Power flagship
- · Fleet hydrogen combustion enhancement trials
- · Installation guide
- · Contact
Across the group
- · combustionenhancement.com.au — Australian systems, pricing and technical reference.
- · hydrogenmachines.com.au — Australian hydrogen machine range.
- · hydrogenmachinesusa.com — United States supply and regulatory information.
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.