High-pressure washers, also known as pressure washers, are categorized based on their power source and pressure capabilities. Here are some of the most common types of high-pressure washers:

1. Electric pressure washer: These are powered by electricity and are ideal for cleaning small to medium-sized areas. They usually have a pressure range of 1300-2300 PSI.

2. Gas pressure washer: These are powered by gasoline and are designed for heavy-duty cleaning tasks. They can generate a pressure range of 2500-4000 PSI and are suitable for cleaning large areas and removing tough stains.

3. Hot water pressure washer: These use a heating element to heat water, which then generates steam and helps remove tough grime and dirt. They can have a pressure range of 2000-4000 PSI and are suitable for cleaning oily and greasy surfaces.

4. Cold water pressure washer: These are the most common type of pressure washer and use cold water to clean surfaces. They are ideal for cleaning dirt and grime from surfaces and have a pressure range of 1300-4000 PSI.

5. Portable pressure washer: These are small and lightweight and can be easily transported to different locations. They are suitable for light to medium cleaning tasks and have a pressure range of 1000-3000 PSI.

6. Electric Pressure Washers: These high-pressure washers are powered by electricity and are ideal for light to medium-duty cleaning tasks. They typically have pressure ratings of up to 2000 PSI (pounds per square inch) and can handle cleaning jobs such as washing cars, outdoor furniture, and small decks.

7. Gas Pressure Washers: These high-pressure washers are powered by gasoline and are designed for heavy-duty cleaning tasks. They typically have pressure ratings ranging from 2,500 to 4,000 PSI and can handle cleaning jobs such as stripping paint, cleaning large decks, and washing sidewalks.

8. Diesel Pressure Washers: These high-pressure washers are powered by diesel fuel and are designed for the most heavy-duty cleaning tasks. They typically have pressure ratings of up to 7000 PSI and are used for cleaning large construction equipment, heavy machinery, and industrial surfaces.

9. Electric Pressure Washer: This type of pressure washer is powered by electricity and is suitable for lighter cleaning tasks such as washing cars, outdoor furniture, and small patios. They are quieter and less powerful than gas pressure washers, but also less expensive and require less maintenance.

10. Gas Pressure Washer: This type of pressure washer is powered by a gas engine and is more suitable for heavy-duty cleaning tasks such as removing dirt and grime from large surfaces such as driveways, decks, and sidewalks. They are more powerful than electric pressure washers, but also lower and require more maintenance.

11. Diesel Pressure Washer: This type of pressure washer is powered by a diesel engine and is ideal for heavy-duty cleaning tasks that require high-pressure water flow, such as cleaning industrial equipment and large vehicles. They are the most powerful type of pressure washer and are designed for heavy-duty use, but they are also the most expensive and require the most maintenance.