Which Water Blaster is Best? A Buyer’s Guide

If you’re in the market for a water blaster, you’ll want to know which water blaster is best, and what you should be looking for. Canstar breaks down the best in water blasters.

Water blaster can be a great tool to have around the house. They make light work of dirty driveways and can get your weatherboards looking as fresh as they did when the house was built. But not all water blasters are created equal

From small battery-powered options, to commercial grade petrol models, the features and power on offer differ. And getting the right model for your needs is important. If you go overboard, you’re spending unneeded dollars. Underdo it, and those tough to do jobs will stay tough.

So, which water blaster is best for you? Canstar takes a look.

Water blasting car

What to Consider before you buy

The main thing to consider before you buy is what you are going to be using the water blaster for. The water pressure of your model (measured in psi) is the main focus when deciding if it’ll be right for your needs. If it’s just some tidying up around the house, a low-psi water blaster will be fine. If you have a long driveway or a heap of pavement, you may want something a little gruntier, to make the job a bit more seamless.

Water blasters come in battery, electric, and petrol motor options: 

  • Battery models are convenient and portable, but tend to be less grunty. They tend to only run for a short amount of time (15-20mins) and have significantly less power (often a psi of only around 300). So these are only good for small jobs, such as cleaning windows or washing down bikes and outdoor furniture.
  • Electric models offer more grunt and are good for all domestic jobs. These are more or less your standard water blasters, good for household jobs, as well as cleaning grime off concrete and houses.
  • Petrol models are the most grunty and can do tough jobs with ease. High-power models are popular for commercial use. However, some models may be appropriate for tough jobs around the house.

Some extra things to consider with a petrol model are:

    • Fuel, oil and maintenance costs
    • Noise
    • Ventilation (petrol models emit exhaust fumes)

What to look for

Some of the things to look for when buying a water blaster are:

Ease of use

Get a feel for the water blaster. Make sure it’s not too large or heavy for you. Also, consider the design: is it easy to change settings or will it require you to stop what you are doing and fiddle around with it? For example, some water blasters have a digital display on the gun handle that allows you to control the pressure without the need to put the gun down.

Furthermore, are the wheels and handle on the cart of good quality? You’ll likely be moving around the cart a lot, you don’t want it tipping over or struggling to roll smoothly.

Efficiency

Most summers in New Zealand, we face some level of water shortage, so being responsible with water use is important. While all water blasters are more water-efficient than your standard garden hose, the efficiency does vary between models.

Keep in mind that this doesn’t only include the water flow rate, but the psi too. If your water blaster has a low flow rate, but a low psi too, it may take longer to clean. If you’re running your water blaster for longer, it may negate any water savings the machine is making.

The bells and whistles

A water blaster should include a variety of nozzle heads and different spray options. Make sure your model has enough features to cover all the different jobs you plan to tackle. Some even come with the ability to add detergent into the water-flow, or job-specific extensions, such as for unblocking drains or cleaning cars and bicycles. Are these something you’ll need?

What to look out for

There are a few extra things that you need to consider before making your purchase:

A PSA on psi

While the water pressure (measured in psi) is the number that water blaster manufacturers like to flex, the water flow rate (litres per minute, or, l/pm) is what really determines how effective a machine will be at cleaning.

If you have a lot of pressure, but not much water, it’s not actually going to clean a whole heap. And, conversely, a high flow rate with low water pressure will end up turning your water blaster into a fancy hose.

Quite simply, the psi isn’t the whole picture. Two models may have the same psi, but if one has a substantially lower water flow rate, it won’t do the job as well.

Simply, the greater the water flow, the more efficient the cleaning process. And if it takes less time to do a job, you could potentially reduce your overall water usage.

Added costs

If you choose a petrol model, you’ll need to consider things such as petrol and oil and maintenance. If you choose an electric model, you’ll need a good extension cord. This can’t be a cheap one you get for a couple of dollars, instead you’ll need a heavy-duty one designed for outdoor use. 

Overdoing it

Domestic water blaster can’t run all day. At most, you might get a couple of hours of continued use. After that, the water blaster will essentially overheat, and you’ll be required to give it a rest.

Most low-end water blasters use an air-cooled pump, but if you want something that’ll last longer, you may need a water-cooled pump. So check to see if this is an option.

Make sure to ask about the cooling system when deciding on a model, so you know how long your particular model can run for. Whatever model you choose, the more efficient the pump is at cooling itself, the longer your water blaster will be able to run. A smaller, cheaper model will probably mean regular tea breaks!

It’s all about safety: things to know before you begin

Spraying water about may not sound dangerous, but a fair bit can go wrong when you’re using a water blaster. Whether that’s hurting yourself, or just causing some serious damage to expensive property, there are a few things you’ll need to know:

High-pressure situation

Water-blasters can cause serious injury. Never point it at someone, as a blast from one of these can cause real harm. 

Test before you go all in

If your water blaster has a high psi, you could end up damaging whatever you’re blasting. Particularly if you are using a focussed nozzle that only covers a small surface area. So make sure you don’t start too close and test it on a small section first. 

Additionally, you should always be extra careful of your surface. Don’t clean your windows with too high pressure, or go all-in on your weatherboards, from close range, with the same pressure as your concrete.

Surfaces such as timber decks can also be extra sensitive. Water blasting these can end up damaging the timber. Be sure to only do so if you are able to do it with low pressure, and a wide nozzle, and don’t ever go lower than 300mm to the deck. Or buy a special nozzle head designed specifically for cleaning decking.

If you’re unsure, it’s always best to check if a model is appropriate for the purpose you want it for.

Always use an RCD

Water and electricity don’t mix. When using an electric water blaster, always have a residual circuit device (RCD) to protect against any electrical faults.

Follow the correct steps

A water blaster should never be run dry. This means, you always need to turn the hose on before you turn on the power. Additionally, never leave it running unattended. Water pressure can quickly build up in the machine, so if you’re not spraying, turn the machine off.

Additionally, despite what you may think, water blasters don’t like to get too wet. Don’t try to clean your water blaster by giving it a water blast!

Always read the manual before first use, and if you are unsure, ask an expert when making your purchase.

The best water blasters to buy

Listed below are some of the best water blasters you can currently buy. While this guide can be helpful, always do your research, and look around for what will be best for you. This may include asking for expert advice, as well as reading customer and user reviews.

Prices listed are the best price found at the time of writing.

The best water blasters: battery

Low end

worx hydroshot water blaster

Worx Hydroshot 20V water blaster ($259)

  • Up to 320psi
  • Up to 2l/pm
  • Battery run time up to 15 minutes
  • Lightweight and compact

Mid range

Karcher KHB 5 Water Blaster

Karcher KHB 5 ($329)

  • Up to 348psi
  • Up to 3.3l/pm
  • Battery run time up to 10 minutes
  • Digital display shows battery run time remaining

 

 

 

Bosch cordless fontus water blaster

High end

Bosch Cordless Fontus Outdoor Cleaner Skin 18V ($399)

  • Up to 218psi
  • Up to 3.1l/pm
  • Battery run time up to 60 minutes
  • 15l integrated water tank means no power or water supply needed
  • Low-pressure option ideal for washing feet or pets

The best water blasters: Electric

Low end

Karcher K2 ($199)

  • Up to 1750psi
  • Up to 6l/pm
  • 100% guarantee anti-rust pump
  • Injector hose for detergent application

 

 

Mid range

Karcher K4 Premium ($599)

  • Up to 2100psi
  • Up to 7l/pm
  • 100% guarantee anti-rust pump
  • Plug ‘n’ Clean detergent system
  • Water-cooled pump
  • Pressure control and display on gun

 

 

 

High end

Karcher K7 Premium Full Control Plus ($1099)

  • Up to 2600psi
  • Up to 8.5l/pm
  • 100% guarantee anti-rust pump
  • Plug ‘n’ Clean detergent system
  • Water-cooled pump
  • Pressure control and display on gun

 

 


The best water blasters: Petrol

Low end

Flash P2000

Flash P2000 ($429)

  • Up to 2000psi
  • Up to 6.8l/pm
  • Spray gun with 4 changeable nozzles
  • Detergent tank
  • 4.0hp Ducar petrol engine
  • Never-flat rubber wheels

Mid range

Ryobi 2750PSI Pressure Washer ($600)

  • Up to 2750psi
  • Up to 6l/pm
  • On board detergent tank
  • Large cart wheels for added stability

 

 

High end

Karcher G3400 XH ($1099)

  • Up to 3400psi
  • Up to 10l/pm
  • GC190 Honda engine
  • Stainless steel nozzles
  • All-terrain tyres
  • High pressure makes it suitable for commercial use

 


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author andrew broadley

About the author of this page

This report was written by Canstar Content Producer, Andrew Broadley. Andrew is an experienced writer with a wide range of industry experience. Starting out, he cut his teeth working as a writer for print and online magazines, and he has worked in both journalism and editorial roles. His content has covered lifestyle and culture, marketing and, more recently, finance for Canstar.


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