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Are Pressure Washers Efficient?

Despite dispensing more water per second, pressure washers are actually more efficient and can save you more money than the average household hosepipe.

Don’t believe us?

This article will explain why pressures washers are actually an efficient choice, helping your business save money and the environment.

If you need a pressure washer, give our team a call on 0808 169 8529

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How do pressure washers work?

Example Animation of the Karcher K 7

Is a pressure washer efficient?

Is a hot pressure washer more efficient than a cold pressure washer?

Can pressure washers recycle the water they use?


How does a pressure washer work?

Before we get into the nitty-gritty, it’s important to understand how a pressure washer works.

There are various different types of pressure washers — hot, cold, electric, gas — and while each type has its own advantages, they all work in the same fundamental way:

A hosepipe sends water from the input of the unit to a pump, which dramatically increases the velocity of the stream and pushes it through a narrow lance, out through the nozzle. The increased velocity of the water, coupled with the shape of the nozzle, causes the water to shoot out in a powerful but controlled stream. The nozzles are interchangeable to give you control over how much pressure is administered.

Example: the Kärcher K 7 Full Control

See below the animated diagram of the K 7 – from

The heart of every pressure washer is its electric motor, which drives the pump system [1].

In order for the pumps to work correctly, they need water, which is provided, for example, by a garden hose [2].

Before it is put under pressure, the water flows into a double-walled casing around the motor, which cools it down [3]. This reduces noise and also extends the device’s run time.

The motor drives a wobble plate, which moves the three pistons up and down [4].

The K 7 Full Control features a total of three pistons, which each work with one suction and one pressure valve. The downward motion of the pistons [6] draws the water through a suction valve [5] and into the cylinder or piston chamber.

When the piston moves up again, it pushes the water out of the piston chamber and through a pressure valve [7] towards the injector.

Cleaning agent [10] is added to the injector [8] if required. The water then flows out of the pump [9] to the high-pressure gun.

Is a pressure washer efficient?

By increasing the velocity of the water it dispenses, pressure washers dramatically increase cleaning performance. So while water is dispensed at a much quicker rate, less time is needed to complete the job.

Studies have shown that using a private pressure washer to wash your car consumes between 6-10 times less water than using a standard hose pipe at low pressure.

An identical cleaning task was carried out using two high-pressure washers, one operating at 1200 litres per hour and another at 700 litres per hour. The 1200-litre unit completed the cleaning task in just 26 minutes, compared to the 1 hour and 12 minutes it took for the 700-litre unit to complete the same task. Over 500 litres of water were saved by using the unit with higher pressure.

How Do Pressure Washers Work? Karcher Pressure Washer Close Up Photo


Is a hot pressure washer more efficient than a cold pressure washer?

It may seem intuitive to think that a pressure washer using cold water would be more energy efficient than an identical pressure washer using hot water, as the latter requires extra energy to heat the water. However, by virtue of the fact that water is heated, it is more effective at tackling stubborn dirt, meaning that the time it takes to clean is reduced.

For a typical cleaning job, the use of hot water can reduce cleaning time by up to 40%.

Hot water is also more hygienic than cold water, though the units are often bulkier and more expensive. Click here to learn more about how hot and cold pressure washers compare.

Can pressure washers recycle the water they use?

Many pressure washers can be operated with recycled or conditioned water. You will need access to a water recycling system to do this, but the number of these systems are increasing — especially in gantry car washes. Water recycling can save up to 98% of water.


Alpha Power Cleaners provide a range of pressure washers and other cleaning equipment to businesses across the East Midlands. If you want your business to operate at the highest performance and with the lowest costs, try our pressure washers.

Delivering an effective and efficient clean, our pressure washers are perfect for use across a range of industries. All our pressure washers are available for hire on contracts between 1 day and 5 years, and you’ll receive all the maintenance and support you’ll need to ensure your business runs smoothly.

To enquire further, give our team a call on 0808 169 8529

Why choose us

80+ Years of Experience

From hot pressure washers to floor scrubber dryers - we know our cleaning equipment, and can help you make the right decision.

Free Site Surveys & Quotations

Our team offer free site surveys and quotes for all our machines. If you are not too sure what you need, or even if you don't know how to clean the area in question, we can help!

Fully Guaranteed Work

All our work is fully guaranteed, we maintain all our machines to the highest standard and ensure that every machine we hire out is fit for purpose.

Same Day or Next Day Delivery

We cover the Midlands and beyond, we are proud to say that we offer next day, or same day delivery across most of our machines for hire.

Karcher Premier Servicing Dealer

Being a Karcher premier servicing dealer, we have access to the latest machines and equipment. This also means that we are experts in everything Karcher.

Tennant Authorised Partners

We are now Tennant Authorised Partners across the East Midlands, this means we have access to the latest machines and parts.

Free Training

We provide free training for all our hire machines. No matter if you have never used one, we will show you how to use it and set it up on-site - so you are ready to go!

Fast Breakdown Repair & Servicing

If you have a machine with us, or one of your own - we provide breakdown repair and servicing across the Midlands. Need help? Contact one of our team today!

Flexible Hire Options

If you need a machine for one day, one week, or one month, we can sort out what is best for you. With several options for hire contracts, we have something suitable for everyone.

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Our work process


Contact our team

Contact us to speak to one of our team, and tell us what you need. We have something for every situation, our team are experts and can tell you exactly what will work best.


Get valuable advice

We will advise what machine is best for you and your situation, taking into account the size and type. Then we can give you a quote over the phone.


Confirm your order

Confirm what day you would like your machine to be delivered, and your location - delivery is free of charge and we cover across the Midlands.



On the day we deliver your machine, we will ensure you are happy and we can then provide training for you, so you are confident using the machine.

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