Frequently asked questions

It is a unit that uses electricity from the vehicle to split water into hydrogen (H2) and oxygen (O2). This process is called electrolysis. The gas mixture is called oxyhydrogen, often known as HHO gas.

The gas is fed into the engine’s air intake, where it mixes with the normal fuel charge. It does not replace your diesel or petrol. It supplements it, helping the engine burn its fuel more completely and cleanly.

Inside the Oxyhydrogen fuel generator:

• Electricity is applied to the water (distilled water with an electrolyte).
• The water molecules split into hydrogen and oxygen gas.
• The gases combine as oxyhydrogen (HHO) gas and are drawn into the engine through the air intake.
• In the combustion chamber, the Fuel-Oxyhydrogen mixture ignites easily, which supports more complete combustion of the diesel or petrol.

The aim: more complete combustion, less wasted fuel and lower emissions.

Hydrogen burns with a faster flame speed than a normal fuel-air mixture. When a small amount is added to the engine’s intake air, it can:

• help the fuel ignite faster;
• help burn more of the fuel, so less is lost as unburnt fuel in the exhaust; and
• help reduce carbon build-up in the engine.

Together, this can support better fuel economy and smoother running. How much depends on the engine and how it is used.

Making the gas does take energy, and the gas on its own would not pay that back as a fuel. That is why we do not use it as a fuel. It is used in small amounts to help another fuel (diesel or petrol) burn more completely.

The electricity comes from the vehicle’s alternator, and the load is small. The aim is that the improvement in combustion saves more fuel than the extra alternator load costs. The way to know for your vehicle is to measure fuel use before and after installation.

It is a fair question, and there are honest reasons:

• Awareness. Many fleet owners have simply not come across the technology, or only know it from hobby kits online.
• Scepticism. Poorly made products and exaggerated claims in the past have given HHO a mixed reputation. That caution is understandable.
• Upfront cost. Buying and installing a system is an investment, and owners want to see the payback before they commit.
• Results vary. The saving depends on the engine, its condition, the load and the duty cycle. No honest supplier can promise the same result on every vehicle.
• Installation and upkeep matter. The system must be correctly sized and installed, and the water must be topped up. A badly fitted or neglected unit will not deliver.

Our approach answers these points: we check compatibility first, an engineer confirms the fit, we suggest starting with one or two vehicles, and we measure fuel use against your own baseline before you roll out further.

Yes, but only when the system is correctly installed and maintained.

The gas is not stored on the vehicle. It is made on demand while the engine runs and is used immediately in combustion.

The system includes safety components such as a non-return (flashback) valve and overheat protection. The PWM controller switches the system with the engine and helps keep the electrical current within safe limits.

Yes. Research over many years, by universities and other research institutions, has studied adding oxyhydrogen to internal combustion engines. You can explore the research and our documented results on the Evidence page.

Many diesel and petrol engines in trucks, buses, generators and heavy machinery can suit the system. Not every engine does, so every installation starts with a compatibility check.

Engine size matters. Larger engines need more generator units: a 3-litre (3 000 cc) engine typically uses one unit, while a large 16-litre (16 000 cc) truck engine may need up to four.

Use the Compatibility Checker for a first check. An engineer then confirms the fit and the right configuration for your vehicle.

No changes are made to the engine itself, the engine sensors or the air-fuel settings. The installation does need a small connection into the air intake for the gas line, plus mounting points for the unit and the water tank.

Typically 2-4 hours per vehicle, depending on the vehicle and the number of units fitted. We can arrange installation at your depot to keep downtime to a minimum.

Installation is included in the sales price.

If you sell a vehicle and want the system removed and fitted to another vehicle, installation fees apply again.

Your sales representative will confirm the fee for your vehicle size.

Very little. The main task is to keep the water reservoir topped up with distilled water, so the generators never run dry. The on-board monitoring system sends an SMS to the driver or yard manager when the water level runs low.

There are no complex moving parts. Your team receives a basic instruction manual to keep the generators in good working order.

It depends on the engine and how it is used. We recommend measuring fuel use over at least 2-4 weeks of normal operation and comparing it with your fuel records from before installation.

Yes. We suggest starting with one or two vehicles and measuring over at least one month before you decide on the rest of the fleet.

You are protected. If you cannot document a saving of at least 10% within the agreed measurement period, we will remove the system and refund you in full. The measurement method and period are agreed in writing before installation.

It may. Some vehicle manufacturers and dealers in South Africa have told us they regard an aftermarket HHO installation as affecting the vehicle or engine warranty. Before you fit a system to a vehicle that is still under warranty, check with your dealer or the manufacturer and get their answer in writing.

For this reason, most of our installations are on vehicles whose manufacturer warranty has already expired.

Yes, financing is available. Ask your sales representative for details, or email sales@hit.africa.