Last updated: August 16, 2021

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If you're thinking of buying a pressure washer and you've decided to do some research before making your purchase, then you've come to the right place! Monederosmart always has the best buying guides on the web for thousands of different products on the market.

Pressure washers have arrived to make it easier to clean cars, yards, garages and many other spaces. They are increasingly being used for household tasks thanks to their powerful jet of pressurised water at prices that are becoming more and more affordable. We know you want to buy the best pressure washer for you, so read on!


  • In this buying guide you will find answers to common questions about pressure washers. Some of these answers include where to buy your pressure washer, as well as the correct way to use them and whether to use them with hot or cold water.
  • There are two types of pressure washers on the market: electric and petrol. Both serve the same purpose, but the choice will depend on your needs. While electric pressure washers depend on always having a contact, petrol pressure washers can be taken anywhere, but generate carbon monoxide emissions.
  • There are some purchasing factors that are important to consider before making a decision. These include power, flow rate, pressure and additional accessories you can purchase. We will discuss these issues in more depth later.

The Best Pressure Washers: Our Picks

Buying guide: What you need to know about pressure washers

Here's our buying guide section, where we answer some of the most common questions about pressure washers. We know that all models may look identical, but you need to know a few particular features to buy the ideal pressure washer for your needs.

The best deep wash for your car can only be achieved with a pressure washer. (Photo: Piyawat Nandeenopparit/

How to use an electric car wash?

First of all, you'll need to be prepared with waterproof clothing, especially a good pair of boots. Once you have connected the hose to the power washer's inlet, turn on the water supply and plug the cord into an outlet. It is important not to turn on the motor before turning on the water tap, as this may damage the pump.

In some cases it is a good idea to add detergent for deeper cleaning. To achieve this you will need to fill a bucket with the solution and let the hose suction from there.

Remember to maintain a 45-degree angle to help loosen the dirt. It is important to keep in mind not to bring the tip closer than 30 centimetres so as not to damage the surface you are cleaning. Finally, be sure to keep the power cord away from water to avoid electric shock.

Electric or petrol pressure washer - what should you look out for?

There are two types of pressure washers available on the market: electric and petrol. Both perform broadly the same functions, but vary in power, size and performance. The type of pressure washer you should buy depends on your needs.

Electric. This is the most common type of pressure washer, as they are inexpensive and there are models for both domestic and industrial use. This type of equipment does not generate any kind of emissions or excessive noise, and its operation will only depend on having the appropriate electrical current.

Petrol. These pressure washers operate independently and can be used anywhere with adequate ventilation. Their use is recommended for professional or industrial jobs, and their operation depends only on the right fuel. They are generally much rougher and heavier equipment.

Electric Petrol
Use Domestic or industrial Industrial
Power Corded Fuel
Emissions None Carbon monoxide
Space requirements Power Adequate ventilation

Are there pressure washers with a boiler?

Most pressure washers operate with cold water directly from the water supply. However, there are some models that incorporate a boiler to draw hot water under pressure, and are very useful for removing stubborn dirt.

Boilerless. This type of pressure washer uses cold water and works for common cleaning tasks. The most common uses are cleaning patios, vehicles, upholstery or windows. They are perfect for all types of surfaces, as long as they are not stained with grease or oil.

With boiler. The pressure washers that incorporate a boiler are used to shoot hot water. They are more expensive but much more efficient at removing oil, grease or other hard to break down material. This reduces working time and increases the effectiveness of detergents and any type of cleaner.

Buying criteria

Now that you have a clearer idea of some of the basics about pressure washers, we would like to share some buying criteria with you. Consider them carefully before making your purchase decision so that you can enjoy your pressure washer to the fullest.


Just like a car engine, the power of a pressure washer is expressed in horsepower (Hp). This power is distributed to generate the pressure needed to push the water through the hose. The power also determines the amount of time it can work per day.

Cold water pressure washer. Cold water pressure washers generally have a lower power output than hot water washers. However, they can run longer in proportion to their horsepower. For example, 5 Hp can last for 4 hours of use. We recommend that you check the power of your pressure washer before purchasing it.

Hot water pressure washer. This type of power washer provides more power, but has a shorter continuous run time. For example, a 7.5 Hp motor provides only 4 hours of use. We recommend that you evaluate your needs to see if you should invest more in power or time of use.

Simon Keeping, director de Kärcher Reino
Depending on the job, using a pressure washer can save between 50 and 80% water. We had to convince the authorities that we were not the bad guys


The main thing about a pressure washer is the PSI pressure

Pressure is expressed in pounds-force per square inch, or PSI (Pounds-force per Square Inch). Depending on the job you want to do, the pressure you should look for in the pressure washer you want to buy. Here are some examples of applications with the minimum pressure required.

Vehicles. One of the most common applications for pressure washers are engine and chassis washes. Any pressure washer with basic pressure can do the job without difficulty. We recommend a 1,500 PSI pressure washer for this purpose.

Platforms and walls. The pressure required for use on vertical spaces, including fences and railings, should be even higher. To make sure you don't fall short on the job, we recommend making sure your pressure washer has at least 2,000 PSI.

Patios and large areas. To cover these types of surfaces, you will need to use the maximum pressure possible on your pressure washer. We recommend that you purchase at least a 3,000 PSI model to get the job done without hassle.


Most pressure washers come with all the accessories you need to get the job done. However, we would like to mention some of the most important ones so that you can always check that your pressure washer includes them, or look for them if it does not.

Nozzles. This is the most important accessory, as it determines the type of spray your pressure washer will produce. A straight line jet has a greater impact, while a fan-shaped jet covers more space with less pressure. We recommend that you make sure you have several nozzles or at least one nozzle that can be adjusted to various jet types.

Foamer. This is a very useful accessory for applying to hard-to-remove dirt on surfaces. It is widely used in vehicle cleaning. We recommend you look for a foamer if you are interested in generating foam in your detergent-water mixture.

Spray gun. Another important part of the pressure washer is the spray gun, as this is the part that comes into direct contact with your hands. We recommend making sure it is ergonomically designed to avoid hand and shoulder fatigue due to the pressure and flow rate.

Extension. If you are looking to reach high places that are difficult to access, you will need a good extension. This is a custom-made plastic tube that attaches to the gun. We recommend that you make sure this extension is at least one metre long.

Flow rate

The flow rate is the number of litres per minute (lpm) that the pressure washer delivers and can also be measured in gallons per minute (gpm). This means that the higher the flow rate, the faster the cleaning speed. This flow rate cannot be increased beyond the capacity of the pressure washer.

Once you are clear on the power of your equipment to clean, the only way to speed up the process is to increase the water speed. We recommend that you review the manufacturer's guide to better understand the specifications of the ideal flow rate for different applications.

(Featured Image Source: Nandeenopparit/