Car Misconceptions: Can You Power a Car with Water?

February 5, 2016

If you’ve had an email address for any length of time, you’ve probably deleted plenty of spam emails trying to sell you a kit that makes your car run off of water. A kit that does this means that a lot of money can be saved since water is far cheaper and more available than gasoline or diesel fuel. If what the spam emails claim is true, why hasn’t someone become a billionaire by starting a company around the concept?

The idea has been around in different forms for a long time and should have shut down by now, most of the viable energy industries such as coal, oil , nuclear, and solar power. Is there a conspiracy to suppress this technology so that the power industries can force us to pay higher energy prices? No. The truth is that, yes, you can make a car (with the right engine) run off of water but you will have to supply the energy to make it happen because it won’t come from the water itself. The idea of using water as a fuel to power a car without substantial energy input on your part is nothing but a car misconception.

Too Good to Be True

A steam-powered engine is like this. It runs off of water in the same sense that you add water to it as well as some energy in the form of burning wood or coal. But as most people easily understand, the water isn’t the fuel that powers the engine. Cars that run on water typically use electrolysis to separate water into hydrogen and oxygen. The hydrogen is then burned to power the engine. What happens to hydrogen when it’s burned? It combines with oxygen and forms water which is the fuel that supposedly powers the car in the first place. That’s like a gasoline engine that puts out gasoline as a waste product after the gasoline has powered the car. It’s too good to be true.

Money Is Saved at the Gas Pump but Is Spent on Higher Electric Bills

The truth is that it takes energy to separate that hydrogen from the water (during electrolysis) before you can use it, just like it takes energy to convert water into steam before you can use it in a steam engine. Some of the energy used in electrolysis is lost in the form of heat, which means that burning the hydrogen gives you less energy than was used producing it. Using such a car will require water and a convenient electrical hookup to supply energy to power the electrolysis. So you save money by not buying gasoline but end up paying a higher electric bill each month. Like the water used in a steam engine, the water isn’t the fuel that powers the car.

For all your auto repair needs in the Wilmington, Delaware area, please contact us.

How to Check Your Car's Fluids? Transmission Fluid, Engine Oil, and More | Paul Campanella’s Auto Ce
November 28, 2025
Paul Campanella’s Auto Centers in Delaware and Pennsylvania explain how to check engine oil, transmission fluid, and other vital fluids to protect your car.
How Does Bad Fuel Impact Engine Performance in Modern Cars? | Paul Campanella’s Auto Centers
October 31, 2025
Paul Campanella’s Auto Centers in Delaware and Pennsylvania explains how contaminated fuel affects combustion, power, and drivability.
What Happens to Your Engine When You Delay an Oil Change | Paul Campanella’s Auto Centers
September 26, 2025
Paul Campanella’s Auto Centers in Delaware and Pennsylvania explain the hidden engine risks of delaying oil changes too long.
Man with arms crossed, smiling in a car repair shop with a car in the background.
July 15, 2025
If you're searching for an auto repair shop with great reviews, you’re not alone. Choosing the right mechanic can make all the difference in keeping your vehicle reliable, safe, and performing at its best. With so many options out there, how do you know which shop you can trust?
Futuristic car in a high-tech garage, with holographic displays and tools.
July 15, 2025
In this article we discuss where AI is now, where we predict it’s headed, and when we can expect to see robots working alongside mechanics.
Man with a gray beard looking at his phone with the hood of his truck open in the background.
July 15, 2025
While we may not operate 24/7, we guarantee that if you book an appointment in the morning, we will have your vehicle looked at the same day.
Premium gas question. Gas pump nozzle with 93 octane label, car in background, dark setting.
July 15, 2025
Let’s explore the world of octane ratings, engine needs, and whether premium gas is a luxury worth buying or just a fancy way to empty your wallet.
Paul Campanella Auto Service: Exterior of auto repair shop with cars in bays, employees, and customers.
July 15, 2025
TALLEYVILLE, DEL. – Paul Campanella’s Auto Centers, a leader in full service automotive repair and maintenance, proudly announces the grand opening of its sixth location at 3805 Concord Pike, Talleyville, Delaware on Monday, June 16, 2025.
Car being inspected by a team of mechanics at a service station.
July 15, 2025
A little preparation can go a long way. Here’s what you need to know to make sure your car passes inspection the first time.
November 6, 2023
In this blog post, we will discuss essential tips for maintaining your car's brakes in the winter, keeping you and your passengers safe as you navigate the icy roads.