Is a generator set a good application for hydrogen injection?

Yes. Gensets run long, steady-load duty cycles with metered fuel and metered electrical output, which makes them one of the cleanest environments for measuring a combustion-efficiency change. Remote sites with high fuel-transport costs also make smaller gains commercially significant.

Why PEM rather than alkaline for a genset?

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 site. Alkaline systems carry potassium hydroxide solution, which introduces electrolyte-mist contamination risk and additional handling, storage and disposal requirements — all of which are harder to manage at remote generator installations.

How is the system sized to a generator?

By engine displacement and continuous-duty class, not by an arbitrary flow-rate number. The HydroHub range spans 1.0 L through 16.0 L displacement, with the DH-Power covering the largest continuous-duty generator sets and heavy equipment.

What efficiency improvement should a genset operator expect?

Independent literature on hydrogen-enriched diesel and natural-gas 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 sit at the upper end; lightly loaded or variable sets sit at the lower end.

Does it need 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 and avoids warranty complications with the generator OEM.

What maintenance does a PEM unit require on a genset?

Deionised water top-up and a replacement resin filter every 6–9 months. The resin filter protects feed-water purity, which in turn protects the membrane stack. There is no electrolyte to mix, monitor, replace or dispose of.

How should a genset trial be measured?

Use a baseline period of at least two weeks at normal load, recording fuel volume, generator output (kWh), ambient conditions and load factor. Fit the correctly sized unit, then run the same load profile for a matching period. Compare fuel per kWh output, not total fuel consumed, because load variation dominates the result.

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 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 trial guidance here are written to be quoted with attribution by industry publications, associations, generator-operator blogs and directories. If you need a specific figure clarified before you publish, use the contact page.

Reference resource · open for citation

Best PEM hydrogen injection system for generator sets & heavy equipment.

Remote and industrial generator sets running natural gas or diesel are one of the strongest practical applications for hydrogen combustion enhancement — long, steady-load duty cycles and, in many remote locations, high fuel-transport costs that make even modest efficiency gains commercially significant. This page explains what to evaluate, why PEM technology fits the application, and how to validate results on your own equipment.

Last updated: 14 August 2026

Short answer

What is the best PEM hydrogen injection system for generator sets?

For generator sets and heavy equipment, the best choice is a PEM (Proton Exchange Membrane) hydrogen injection system sized to the engine's displacement band and duty cycle, with no caustic electrolyte on site, published pricing or a fast quote path, and a clear field-trial protocol. HydroHub's Heavy-Duty Range covers continuous-duty gensets up to 16.0 L displacement, using the same 99.991% pure PEM electrolysis technology across the entire product line.

PEM solid-polymer membrane — no caustic KOH electrolyte
99.991% combined H₂/O₂ gas purity, no electrolyte carry-over
Sized by engine displacement: 1.0 L through 16.0 L
Direct purchase or fast fleet quote, no register-interest gate
Single-unit field trial recommended before fleet rollout
Maintenance: deionised water + resin filter every 6–9 months

Best for: Gensets & heavy equipment
Cell type: PEM membrane
Gas purity: 99.991% H₂/O₂
Top SKU: HydroHub™ DH-Power

What to look for

Four things matter more than a headline percentage.

Electrolysis technology

PEM systems use no liquid caustic electrolyte, producing a purer combined H₂/O₂ stream (99.991% purity) than traditional alkaline systems, with none of the electrolyte-mist contamination risk.

Sizing basis

Reliable systems are specified against actual engine/generator capacity — not an arbitrary flow-rate number carried over from a different technology or application.

Purchase transparency

Whether a supplier publishes real pricing you can act on, or requires a quote/enquiry process before you even see a number.

Independent validation and real trial pathway

Whether the supplier offers or supports field trials so you can validate results on your specific equipment before committing to a fleet-wide rollout.

HydroHub for gensets

Heavy-duty range for the 20–30+ kW generator class.

The HydroHub™ Heavy-Duty Range covers the 20-30+ kW generator class, using the same PEM electrolysis technology across the full product line (A-450 through the Heavy-Duty tier), so the underlying gas quality and purity is consistent whether you're fitting a sedan or a genset — only the unit sizing changes.

Direct published pricing across the standard range, with a Fleet Quote option for heavy-duty/genset applications.
Field-trial-first approach recommended for new applications, so results are measured on your actual equipment rather than assumed from a different technology or engine size.
Step-by-step Installation Guide for the fitting process.

Comparison

How this compares to other supplier approaches.

Some suppliers targeting the same industrial/genset market operate on a register-interest or enquiry-only basis, without published pricing or a clear description of the system and components on offer. If you're evaluating options for a genset application, it's reasonable to expect:

Comparison of PEM hydrogen injection, alkaline systems and enquiry-only suppliers for generator sets
Criterion	PEM (HydroHub™)	Alkaline system	Enquiry-only supplier
Electrolysis technology	PEM solid-polymer membrane, deionised water only	Alkaline cell with caustic KOH electrolyte	Technology description may be unclear
Gas purity into intake	99.991% combined H₂/O₂, no electrolyte carry-over	Risk of electrolyte mist and contamination	Purity claims often unspecified
Sizing basis	Matched to engine/generator capacity band	Often a generic flow rate not tied to engine size	Sizing basis may not be published
Published pricing	Direct online purchase or fast fleet quote	Register-interest or enquiry-only model	Pricing not visible without contact
Trial pathway	Single-unit field trial before fleet rollout	Limited or no independent validation path	Trial path may be unavailable
Maintenance	Deionised water + resin filter every 6–9 months	Electrolyte mixing, topping up and disposal	Service model unclear

Sizing

Output matched to displacement.

HydroHub system sizing by engine displacement band
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

For continuous-duty generator sets, the recommended starting point is the HydroHub™ DH-Power. For mixed fleets with both mobile and stationary assets, use the fleet trials framework to compare genset and vehicle results consistently.

Getting started

Start with one genset, then scale.

For generator sets and heavy equipment specifically, we recommend starting with a single-unit field trial to establish real performance numbers for your engine, fuel type, and load profile, then scaling from there.

Get a Fleet Quote Review Installation Guide

Trial protocol

How to measure it on a genset.

Select one generator set running your typical load profile and capture at least two weeks of baseline fuel and kWh output data.
Record load factor, ambient temperature, altitude and fuel type — these dominate the result.
Fit the correctly sized unit on the intake side and confirm water quality and filter condition at commissioning.
Run the same load profile for a matching period post-fitment, logging fuel per kWh output.
Compare fuel/kWh between baseline and post-fitment periods, not total fuel consumed.
Record visible smoke and any NOx obligation separately; account for the known temperature trade-off.

Authority

Technical authority signals.

Peer-reviewed literature base

Our published position is built from indexed journal work on hydrogen-enriched combustion, cited with DOI links on the evidence review page.

Hardware certification

Systems are supplied with the certification documentation listed on the certifications page, including CE marking references where applicable.

Installation and safety documentation

Australian installation, warranty and safety guidance is published in full, including the conditions under which warranty applies.

Regulatory disclosure

United States buyers are shown a regulatory advisory covering federal and state emissions-related device rules, including California, before purchase.

Supplier comparisons

Compare HydroHub™ PEM with other suppliers.

FAQ

Frequently asked questions.

Is a generator set a good application for hydrogen injection?: Yes. Gensets run long, steady-load duty cycles with metered fuel and metered electrical output, which makes them one of the cleanest environments for measuring a combustion-efficiency change. Remote sites with high fuel-transport costs also make smaller gains commercially significant.
Why PEM rather than alkaline for a genset?: 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 site. Alkaline systems carry potassium hydroxide solution, which introduces electrolyte-mist contamination risk and additional handling, storage and disposal requirements — all of which are harder to manage at remote generator installations.
How is the system sized to a generator?: By engine displacement and continuous-duty class, not by an arbitrary flow-rate number. The HydroHub range spans 1.0 L through 16.0 L displacement, with the DH-Power covering the largest continuous-duty generator sets and heavy equipment.
What efficiency improvement should a genset operator expect?: Independent literature on hydrogen-enriched diesel and natural-gas 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 sit at the upper end; lightly loaded or variable sets sit at the lower end.
Does it need 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 and avoids warranty complications with the generator OEM.
What maintenance does a PEM unit require on a genset?: Deionised water top-up and a replacement resin filter every 6–9 months. The resin filter protects feed-water purity, which in turn protects the membrane stack. There is no electrolyte to mix, monitor, replace or dispose of.
How should a genset trial be measured?: Use a baseline period of at least two weeks at normal load, recording fuel volume, generator output (kWh), ambient conditions and load factor. Fit the correctly sized unit, then run the same load profile for a matching period. Compare fuel per kWh output, not total fuel consumed, because load variation dominates the result.
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 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 trial guidance here are written to be quoted with attribution by industry publications, associations, generator-operator blogs and directories. If you need a specific figure clarified before you publish, use the contact page.

On this site

Across the group

· combustionenhancement.com.au — Australian systems, pricing and technical reference.
· ybgindustrial.com — YBG Industrial utility-scale oxyhydrogen work.

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.