Clean Diesel Power
Is No Contradiction. (Neither are the Savings).
Modern diesel internal combustion engines typically only completely burn 70% of fuel injected during the combustion process. The other 30% is left behind as partially burned hydrocarbons that clog the engine and exhaust systems, contaminate the oil, and blow out the stack, producing pollution and smog.
Why Hydrogen On Demand?
Hydrogen on Demand Technologies is the worldwide original equipment manufacturer (OEM) of Diesel Hydrogen Assist Technology (D-HAT™) generators, a certified and warrantied aftermarket device designed to work on all large diesel internal combustion engines (6 liters and larger in size) including trucks, buses, heavy equipment, marine vessels, power generation and more.
D-HAT provides a hydrogen-assisted fuel burn that enhances the combustion characteristics of diesel equipment by increasing overall efficiency to 95% or higher. The results are transformational: by an increasing torque, less fuel is spent for a given amount of work, providing better mileage, higher-performing engines, as well as far fewer pollutants.

The Hydrogen On Demand Process
Each D-HAT unit produces up to 4 standard liters of 99.9% pure hydrogen per-minute using one of the most compact and highly efficient electrolysis processes available.

01 Just add water
D-HAT’s water-to-hydrogen conversion process starts with distilled water (the only thing you ever have to add). The distilled water is used as feedstock and pumped to our Proton Exchange Membrane (PEM) fuel cell.
02 Patented Proton Exchange Membrane fuel cell
Our proprietary PEM cell technology reliably and continuously converts the distilled water into hydrogen through an electrolysis process.


03 Scalable hydrogen production
Our highly efficient electrolysis process produces more hydrogen using a smaller surface area that most other processes. It draws a fractional amount of power from the diesel engine's alternator/electrical system to produce up to 4 standard liters of hydrogen per minute, delivering only that hydrogen to the running engine.
04 Up to 99.9% pure hydrogen injection
The hydrogen gas is plumbed into the air-intake manifold using industry-standard tubing and tube fittings. No engine modifications are required.


05 On-time hydrogen added in optimum amount
The hydrogen-enriched air mixture is introduced into the diesel engine cylinder along with the injected diesel fuel. Since hydrogen burns 10x faster than the diesel fuel, the hydrogen-assisted combustion event is complete. Greater than 95% of the fuel is burned very efficiently, producing additional power and torque in each power stroke.
06 More energetic fuel burn = more torque
The small concentration of hydrogen enriches the air/fuel mixture and assists the combustion of injected diesel fuel to burn more completely. The greater combustion efficiency means the piston is pushed down harder, yielding increased torque, improved fuel economy and reduced emissions.


07 More carbon burned inside engine = reduced harmful emissions
Almost all the fuel burns completely inside the engine before the exhaust valve is opened near the bottom of the stroke. Torque and fuel economy increase while emissions and vehicle maintenance decrease.
Put The Power Of Hydrogen On Demand To Work For You
The addition of D-HAT generators to your diesel-powered equipment can deliver a triple bottom line impact by improving your sustainability position, increasing net operating profitability, while reducing net operating expenses.


TAKE D-HAT FOR A 90-DAY SPIN
You will see up to a 10% increase in fuel efficiency plus reductions in maintenance costs and a significant reduction in emissions.
SYSTEM WARRANTY
Because we make no modifications to the engine, engine sensors or air-fuel settings, D-HAT hydrogen on demand generators maintain all your original engine warranties.
Hydrogen On Demand Technologies stands behind the performance of our product by offering the following with every purchase:
Limited 3-Year Warranty: 3-year or 300,000 miles (or 25,000 operating hours) warranty that includes parts and labor.

Benchmark Test Report
U.S. Department of Energy Benchmark Test Report
ROI Calculator
Calculate how much fuel and maintenance savings you can take to your bottom line
Solution Overview
Diesel Hydrogen Assist Technology (D-HAT) Solution Overview