Best Knapsack Sprayers – My top models I use as a professional gardener

As a professional gardener for a little over twenty years and working in my family’s small garden centre for even longer, I really do appreciate a well-built, versatile, and, more importantly, comfortable backpack sprayer. Over the years, backpack sprayers have greatly improved, with many models now being somewhat comfortable to wear despite their weight when full of liquid. Plus, the introduction of cordless knapsack sprayers makes spraying even easier to consistently regulate pressure. I’ve included a couple of cordless models in this guide but I also have a guide dedicated to cordless knapsack sprayers here.

I’ve personally used garden sprayers for spraying pesticides and fungicides inside the greenhouses and polytunnels on the nursery to control aphids and help prevent diseases, including rust on fuchsias, mildew on violas, and, of course, black spots on roses. I also regularly use them to apply weedkillers, more recently testing pet-friendly weedkillers with my Hozelock Pulsar Plus Sprayer. 

This guide has previously discussed several handheld garden sprayers. However, I will also discuss my experience using several backpack sprayers. The main advantage of using a backpack sprayer is its capacity, especially in the nursery. I can spend less time mixing and refilling, which makes it much easier to spray larger areas on the go.

While it’s on my mind, I will also mention that for painting fences or sheds like I recently did at home, I use the Wagner Fence & Decking Paint Sprayer pictured above. I’ve talked about this sprayer separately here.

I almost forgot: I’ve also used the best knapsack sprayers to apply iron sulphate to lawns. It’s a much more efficient way to apply moss killer than using a watering can or even a lawn spreader. I use Iron Sulphate to control moss on lawns, and as it’s also a lawn tonic, it greens up lawns, too. I’ve also talked about moss killers for lawns here.

So, knapsack sprayers can vary widely in price, from £40 for a budget sprayer to well over £500 for a commercial-graded backpack sprayer like the Solo 416LI Pro Electric Backpack Sprayer pictured above, which we use in the nursery. Now, for most people, I would not recommend spending this sort of money, as it’s simply not needed for occassional use around the garden.

Now, I’m a big fan of my Hozelock 16L Pressure Sprayer Pulsar Plus pictured above. I have owned this one for a few years now. I originally purchased it to replace one of my Cooper Peglers, which are of excellent quality (we had two for about 15 years), but they’re not very comfortable. Anyway, I needed to replace one of my sprayers quickly, so I just got the Hozelock Pulsar Plus from my local DIY store; I was not expecting it to last long, but I just needed to finish some scheduled spraying jobs. 

With the Hozelock Pulsar being half the price of Cooper Pegler at under £100, I’ve got to admit, I’ve been very impressed with the build quality. It also has an innovative adjust nozzle that allows you to adjust the spray pattern from a fine mist to a heavier fan spray, so it’s perfect for any spraying job, from spraying pesticides or fungicides using a mist setting to using a fan sprayer to apply weedkiller or even patio cleaners. 

Just a quick note on spraying weedkillers. I personally have separate sprayers for weedkiller only; in my case, it’s the Cooper Pegler CP3 pictured above.

I don’t advise it; however, if you use the same sprayer for all spraying, make sure you rinse the tank and lance out very well, ideally 2-3 times and spray clean water through it to clean out all the hoses and lance, to avoid spraying your plants with weedkiller by mistake.

For many years, I’ve also used the Cooper Pegler Classic CP15 15L Knapsack Sprayer which is the one pictured above. Now, they are exceptionally well made, and we have had the same two in the nursery for over 15 years; that’s how well made they are, and they still work and are used occasionally even today. However, it is worth noting that they are not the most comfortable to wear on your back, especially when filled with 20 litres of liquid. I usually just fill them up with 10-15 litres to make them more comfortable, a little lighter, and more manageable.

I know a few landscape gardeners who are friends of mine who have switched to Berthoud Vermorel Knapsack Sprayers. I’ve not personally used them myself. However, they tell me they are very comfortable to wear with substantially more padding, are a similar price to Cooper Pegler knapsack sprayers, and are equally as well made, just more comfortable to wear.

Here is a quick video by Hortweek on YouTube looking at the Berthound Knapsack sprayer

Before I get into my main review of the best knapsack sprayers, I want to mention cordless backpack sprayers quickly. As previously mentioned, we have a Solo 416LI Pro Electric Backpack Sprayer, which is an excellent sprayer. There is no manual pumping, and it maintains constant pressure for easy, effortless spraying. However, they were very expensive, over £500 we paid, and they could be even more expensive now as we have had ours for a few years now. 

However, if you already have Ryobi 18V tools, then the Ryobi 18V ONE Plus Cordless Backpack Sprayer is worth considering, as you can get the bare tool for under £200. Now, it’s not cheap; it’s still double the price of my Hozelock Pulsar. However, if you want to go down the cordless route, it’s a good alturnative to my Solo 416LI Pro Electric Backpack Sprayer, and it’s much more affordable. It has nice large straps, so it’s comfortable on your back, and it has an adjustable nozzle like the Hozelock to tackle different types of applications. It is also well made and worth considering; no more pumping as you spray!

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Knapsack Sprayer Reviews

1. Hozelock 16L Pressure Sprayer Pulsar Plus

BEST PICK

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There are a few versions of this Hozelock backpack sprayer, but the newest versions have been slightly improved with what I think is a much better innovative nozzle. The issue is they are almost identical. Even if you order the older model, they might send the newest model anyway, as this is what happened to me. I didn’t realise at the time, but I’m glad they did. I suspect they will slowly phase out the older model as stock becomes unavailable.

So, the model I have is the Hozelock Pulsar Plus Knapsack Sprayer. The “Pulsar” bit is the only difference in the name, and sometimes, it’s not even used in the product titles, so check carefully before ordering. It’s available in a 16-litre version, which is the model I have, but you can also get it in a slightly smaller 12-litre version, which may be a more manageable size for some people.

So first I will talk a little about the new innovative nozzle as this is how you know you buying the latest improved version which I think is the one you want.

So, with most sprayers, suitable sprayers anyway, you usually have to change the nozzles to get different spray patterns depending on whether you need a mist or heavier spray. You littery have to unscrew the nozzle, change the inside bit and then re-screw the nozzle back on. However, I think the rotating nozzle on this model is excellent. You turn the nozzle and select numbers 1, 2 or 3 to adjust the spray pattern, absolutly brilliant design, no more losing the noozles.

On the very well-made lance itself, there is also a pressure regular (the red part in the picture above) that keeps the pressure at the lance at 1 bar. Now, this just keeps the pressure consistent, and it gives a much more even spray, so you get a much more even application, which in turn gives better results and helps avoid overapplication.

In terms of using the sprayer and comfort, it has a large, substantial handle for keeping the tank pressurised, and this works well. I’ve had no issues with this at all. It doesn’t take long to pressurise the tank, and there is minimal pumping afterwards to keep it pressurised. If you have ever used cheap sprayers, you will know you need to consistently keep pumping like it is made to maintain the pressure.

It’s comfortable on my back and I also like that it also has padded shoulder straps, as shown above, even the CP Pegler does have padded straps.

So what really matters is the spray, as mentioned you turn the nozzle to select between 3 different spray patterns. I have tried to capture them in the images below, but it’s a little difficult, you should get a good idea of what the sprays are like.

The first spray pattern in more of a mist, this is great for spraying pesticides or fungicides.

Number 2 is more suited to weedkillers, I would say, heavier and applied with a heavier spray.

Number 3 is heaver again, now this is better for spraying patio cleaners than would benefit from a heavier spray.

So, in terms of build quality, I think it’s excellent. I have no complaints. Everything is well made, with very sturdy plastics and a metal lance. It certainly doesn’t feel cheap like some of the cheaper alternatives.

Something I do like is the two handled design and this is something that is often overlooked. So when you wash it out after use, you fill it with clean water, give it a good swell, run the lance through on spray but when it comes time to empty the water from the container, you need to pick it up pour the water out.

Now, with some models, this is sometimes easier said than done, with no easy place to hold the tank properly. However, with this model, you have a top handle, which is also great for carrying it, but you also have a handle under the tank so you can get a firm grip to empty the tank. Like I said often overlooked but super useful.

So when it arrived, there was some simple assembly to do; you needed to attach the handle, left or right side, and put the lance together, but everything slides and clicks together.

A little tip, though: when you need to push the flexible tube onto the lance, put the end of the rubber tube into some boiling water for a few seconds and then push it on. This makes life much easier and gives a better seal.

Now, one final feature worth mentioning: this model is super easy to store as the handle can be positioned in the upright position, and it clicks into place. However, the lance also clicks on the handle to store everything neatly. This shows that Hozelock really has tried to think of everything.

And finally, this Hozelock sprayer comes with a three-year warranty, perhaps making a statement on its durability.

Pros

• Large capacity, choice of 12 and 16 litres.
• Ergonomic design, comfortable against your back.
• Adjustable padded straps put less strain on your shoulders.
• Adjustable nozzle that you can turn to select 3 different spray patterns.
• 3-year warranty for full peace of mind

My recommendation

Overall, I’m really pleased with this backpack sprayer by Hozelock. Sometimes I feel like Hozelock use their name to put products onto the market but they cut corners on quality but still charge a premium for them. However, with this sprayer, I think they have really come up with one of the most innovative sprayers you can currently get and it’s very well made.

Personally, I would recommend getting this sprayer for most people. For professional use, you might want to consider the Cooper Pegler I review below, but for everyone else, unless you want a cordless sprayer, you really can’t go wrong with investing in this sprayer.

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16 Litre model

12 litre model

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2. Cooper Pegler Classic CP15 15L Knapsack Sprayer

PROFESSIONAL PICK

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This backpack sprayer comes packed with an array of unique features ideal for professional gardeners. Featuring a design supported by professionals for more than three decades, including myself, this sprayer is a standout amongst the most trusted garden knapsack sprayers, but where they excel in build quality and reliability. This sprayer has been used in the harshest and toughest situations around the world and passed the test.

The durability originates from the distinctive diaphragm pump and its integrated pressure control system. The diaphragm pump system is extremely tough, with an improved outline to guarantee that there is no friction between the diaphragm and the surrounding surfaces.

This makes pumping far less demanding, and the need for grease is eliminated, with just normal cleaning necessary. The unique polypropylene material used to build the pump additionally makes it pretty adaptable and tough, avoiding wear and tear brought on by filthy water and other abrasives you might use then. I myself have one of these we use with weedkillers and have had it for over 20 years, and it’s still working fine. The CP15 pictured below is probably around ten years old and going strong.

The use of brass components also enhances the solidity of this sprayer and the UV stabilisation, which prevents sun damage. Additionally, the 500mm glass fibre-reinforced plastic lance and high-pressure resistant hose are both tough accessories, providing dependable performance in a wide variety of applications.

The CP 15 sprayer features a large 140mm tank opening that averts chemical spillages when filling. The mesh strainer also reduces the risk of dirt contaminating the tank. In addition, the pressure control valve has fixed settings for spraying herbicides, fungicides, and pesticides.

The tank’s ergonomic design offers comfortable and secure use in all circumstances. The polyester cushioned shoulder straps and carry handle ensure that working and transporting the CP15 is as easy and comfortable as possible, although probably not quite as well designed as Hozelock’s.

A separate seal and air vent on the lid ensures no fluid escapes while being used. The intelligent design of the pump means it can be operated with either the right or left hand, making it workable for every user. The CP Classic 15 also comes with a convenient measuring jug.

Pros

• It is ideal for professional use, where they are expected to get used daily.
• Reinforced hose for high pressure resistance.
• The lid comes with a separate seal and air vent for secure locking.
• Lightweight.
• UV-stabilised polypropylene tank for durability.
• Low mesh strainer for filtering out dirt.
• Supplementary filter on the trigger.
• Equipped with pressure control valve.

My recommendation

The Cooper Pegler classic knapsack CP15 is a sophisticated backpack sprayer equipped with high-end materials. The 15-litre capacity is ideal for most users, whether you have smaller or larger areas to treat.

However, it is the most expensive item on my list, but the quality and performance are unmatched. This is by far the best option for professional use, which is why we have used them around my family’s nursery for over 20 years.

However, at 3 to 4 times more expensive than most other sprayers on the market, it’s probably not suitable for all home users solely because of the price tag. For professional spraying, though, you really can’t go wrong with this sprayer; you will only ever need to buy one.

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3. Oregon 518771 Backpack Sprayer

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This Oregon Backpack Sprayer holds an incredible 20 litres of liquid when full, which can treat most large gardens with only one fill. It’s a good alternative to the Hozelock Backpack sprayer I reviewed earlier. It needs a bit of assembly, but this only takes minutes despite the instructions not being that clear. It’s easy enough to put together.

Lifting this sprayer onto your back will not be particularly easy and might take some jiggling around to get your second arm through the strap. But once on, it feels secure and is fairly comfortable. The main issue is how long you will be able to carry it around (when full) on your back; most people will struggle with this after around half an hour or so, but that goes for all large knapsack sprayers, which is why I mentioned earlier I usually just add 10-15 litres to liquid and prefer just to refill a little sooner if needed.

It comes with two adjustable spray nozzles; the fan nozzle and the spray nozzle. The fan spray fits tight and sprays a storm with little effort, covering a wide area. The spray nozzle, on the other hand, gives you more control over where the liquid goes. Basiclly, one is better suited to fine sprays for pesticides while the other spray would be better for weedkillers and even moss killers for treating lawns.

Pros

• Comes with a lance and two adjustable spray nozzles.
• Maximum working pressure: 0.2-0.3 MPA and max pressure is 1.0 MPA.
• 0.9-litre pressurised chamber capacity.
• 20-litre working capacity.
• Non-pressurised tank type.

My recommendation

I love the size of the Oregon backpack sprayer, but the discomfort of carrying 20 litres can be a little too much for some. Otherwise, this is another sprayer to choose if you have a large garden and can handle the extra weight on your back and are looking for a more affordable but like the Hozelock model, a sprayer that is very well made.

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4. Solo 416 LI Pro Electric Backpack Sprayer

BEST PROFESSIONAL ELECTRIC PICK

This Solo 416 LI Pro Backpack Sprayer uses an electric pump that is powered by a lithium-ion battery to create the needed pressure for effective spraying on larger scales, which is one of the reasons we decided to invest in one of these for the family nursery instead of using the CP knapsack sprayers or the larger barrow sprayer we also use.

No more consistently pumping a handle to keep the pressure high. If you have used large pump sprayers in the past then you will appreciate not having to pump as you spray and will know how tiring it can be, especially when the tank is also full of chemicals.

It’s also worth noting that this 416Li model is updated from heavier previous models that used the old heavy-led gel batteries. This model is powered by a 12V 7.8Ah lithium-ion battery and charger. When fully charged (after about 5 hours), on the low pressure setting, 2.5 bar, you can get approximately 5.9 hours of spraying from a single charge. From setting two, at 4.3 bar, you get around 3.7 hours of spraying time. This is good enough for nearly all spraying jobs that you probably wouldn’t want to spend any longer than this with a sprayer on your back anyway.

With a capacity of 20 litres, you can cover a large area before requiring a refill. This sprayer body and tank is made of UV treated high-quality plastic to ensure it will last for many years.

As I’ve already mentioned, the sprayer features two pressure bars that you can choose from depending on how far you want the liquid in question to spray. The previous ratings quoted were a maximum pressure rating. If we look at discharge pressure, you can select the lower 1.4 bar or the higher 2.8 bar by adjusting the mechanism provided.

You will have no problems with reach thanks to the 50cm telescopic wand length and the 150cm hose. The 6.4kg model is supplied with a harness to balance the weight of the sprayer as you move around. Alongside the battery and charger, you will find a flat jet nozzle and a pressure gauge in the delivery box. Within a few minutes of assembly, this model will be ready to use.

Pros

• Perfect for professionals spraying inside large greenhouses or tunnels as well as large scale spraying outdoors.
• Powered by a 12v 7.8Ah battery which gives up to 5.5 hours of spraying from a full charge.
• Provides a large capacity 20 litre tank for effective coverage.
• Supplied with a flat jet nozzle and pressure gauge for convenience.
• Can hold different types of chemicals from pesticides to herbicides.
• Features a comfortable harness for easy manoeuvrability and comfort.
• Provides a telescopic wand for easy reach.
• Offers two pressure settings for better user control.
• Concealed drainage pipe at rear to make emptying the tank easy.
• 1 year warranty for full peace of mind.

Cons

• As with all knapsack sprayers, it can be quite heavy to carry along after a while.

My recommendation

I would recommend the Solo 416Li Pro Backpack Sprayer for those who have large gardens/greenhouses or are professional gardeners with lots of spraying to attend to. Now, I do think if you need to use it occasionally but not professionally, the Ryobi cordless backpack sprayer is a better option, especially if you already have other Ryobi power tools and can just invest in the bare tool and use the battery and charger from your other Ryobi tools.

It is a bit pricey; however, for professional gardeners, nurseries and garden centres like my own, I do think it’s a worthwhile investment and a big improvement on using the traditional pump and spray models. It just makes life easier.

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5. Faithfull 6AV Backpack Sprayer

A GOOD BUDGET PICK

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Faithfull has designed this sprayer with the bigger jobs in mind, and you can see this from the 16-litre capacity tank. Even with that large size, you’ll be surprised that the transparent container is pretty lightweight and far easier to carry than most other sprayers. The real value of the Faithfull SPRAY 16AV lies in the strong construction and high-quality design but at a more affordable price.

The pump action is quite easy to use, and the sprayer maintains a high pressure. With a single refill, you can easily treat a 200 sq. meter garden within an hour. It is one of the few sprayers equipped with a safety valve. It can deal with difficult tasks that require applying different garden chemicals, including pesticides, herbicides, fungicides, and weedkillers. The adjustable spray nozzle even allows you to change between fine-to-stream splashing modes easily.

Working with this backpack sprayer is also simple. The straps are easy to fit and adjust, plus they are comfortable to wear even when the knapsack is full. Just stand the knapsack where you can kneel and slide your arms in backwards.

Pros

• Tough construction.
• Shatterproof and frost-resistant.
• 16-litre easy-carry knapsack.
• Trigger lock for continuous use.
• Lightweight.
• Adjustable spray nozzle.

My recommendation

The Faithfull SPRAY 16AV Knapsack sprayer is ideal for use in large areas such as greenhouses and vegetable plots. Or if you have an overgrown garden, then you’ll love this backpack sprayer as it will save time for refills. It is probably one of the most affordable on my list whilst still being manufactured to a very good standard which is why I’ve included in on my list.

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6. Matabi Supergreen 16 Knapsack Sprayer

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This Matabi Supergreen 16 knapsack sprayer comes in a lightweight design, and this helps to reduce fatigue whilst it is being used. The straps of this sprayer are adjustable meaning they can easily fit all sorts of bodies and the padding makes them pretty comfortable too. The filling point is large enough so there won’t be any spillages when refilling the knapsack.

It features a screw connected hose and that means there are no clamps needed for the hose connection. The fibreglass lance measures 3.2m, which is ideal for high spraying, it has an extension of 0.5m for horizontal and vertical applications, and up to 1.5m extensions for high work.

The pressure regulator is a big bonus considering not many sprayers are equipped with this feature. It has three functions; 1.5 bar for herbicide application, 3 bar function for fungicide and insecticide application, and the free flow function. The pressure regulator ensures even treatment and it’s quite environmentally friendly.

The sprayer comes with a conical hood and a rectangular hood which both work to protect the adjacent crops when applying herbicides. Just fix either on the nozzle end and you won’t be worried about spraying the chemicals in the air or perhaps even landing on your face. The box contains a set of nozzles designed for different applications – pesticides, fungicides and insecticides.

Pros

• Adjustable nozzle.
• Large filling mouth.
• Safety release valve.
• Level indicator.
• Adjustable padded straps.
• Automatic decompression valve.
• Adjustable pressure regulator.
• Internal tank reinforcing ribs.

My recommendation

This Matabi Supergreen 16 is one of the best-equipped sprayers available and it’s no surprise that the good features all combine with an expensive sprayer.

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Knapsack & Backpack Sprayer Buyer’s Guide

The current market has a variety of sprayers that you can use to get rid of any unwanted pests or weeds in your garden. There are two common main types available: diaphragm sprayers and piston sprayers. These cover wide areas without spreading the contents over unwanted areas.

Piston pumps are usually characterised by upward and downward motion whilst dispensing the liquid. Through pumping, the pressure required to spray the liquid is achieved. The piston pump can generate pressure as high as 90 psi.

Diaphragm pumps use the same principle of using pressure to dispense the liquid. The most notable difference between the two is that the diaphragm can withstand harsh chemicals. The other difference between them is that, the diaphragm is costlier and that it can pass smaller abrasive particles through its system.

Here are some of the things to consider before buying a sprayer:

• Functionality – Before selecting a pump that suits your needs, you need to check on functionality. Whether for woody plants or vegetables you may need sprayers that best serve the purpose. The solution to be used also determines the kind of sprayer to be used. Diaphragm sprayers are known to handle harsher chemicals better than piston sprayers. They also need to meet the pressure and area allocation requirements to carry out the intended purpose.
• Durability and maintenance – Depending on the overall number of uses, every garden requires a durable pump. It must be able to handle the liquid being dispensed. The tank especially, should be comprised of a high density material, preferably polyethylene strengthened by UV protection. The other parts like seals and hoses should be made of durable material to manage the constant wear and tear caused by chemicals.
• Motorised or manual? – This is entirely dependable on your preferences or if you are covering new ground. Generally, manual sprayers are generally recommended for treating foreign infestations. Motorised sprayers are usually used when large parts of land need to be covered. Be sure to keep an eye out for sprayers with switchable side nozzles to promote easy spraying.The main differences in motorised and manual sprayers are many. Some of the more notable ones include, motorised sprayers are heavier, more expensive and require more attention during maintenance than the manual ones. If you do opt for the motorised ones, be sure to check how long the batteries hold power without requiring recharge.
• Spray lance – To prevent harmful leaks from getting to unwanted places, select a spray wand capable of minimising leaks and still have accurate aim. Keep in mind to select spray wands that are compatible with the caps and nozzles. Insist on getting information on the quality of materials.
• Safety & Comfort – The overall comfort and health of the user is paramount. Features included, such as wand grip and pump handle, will relieve the operator of unwanted fatigue. The straps have to be padded and the tanks ergonomically designed just to make carriage easier. Search for rubber seals that are resistant to softening and swelling that causes prevalent leaks.
• Reputable brands – Look out for reputable brands that have great reviews from previous users. These brands provide high quality products with warranties and guarantees. When something goes wrong with the pump within the warranty, the company will be liable and you can quickly get the issue resolved.
• Maintenance – Depending on the pump used or the solution, you can use either water or a recommended tank cleaner so as to remove corrosive material and blockages in nozzles. During dire weather conditions like winter, the application of anti-freeze will enhance usage. Considering that anti-freeze is corrosive and toxic, you should take care when handling this compound. Lubricate all major joints to prevent rust and dryness that may lead to cracking. Cracking encourages leaks. Keep in stock spare parts that need constant replacing, so that you are able to fix issues when emergencies arise.
• Calibration – Proper calibration is crucial in setting trajectory. Factors to consider during calibration include, walking speed, required output per minute and the swath width.

Make sure to:

• Clean the nozzle and sprayer
• Measure out pressure requires for estimated surface
• Take a container and spray inside with equal pressure and time to work out the sprayers output.

With all this done you are now ready to pick out the best backpack sprayer according to your own needs and budget.

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Final Conclusion

Buying a quality garden sprayer should be every gardener’s goal. There are several choices you can make and whilst some backpack sprayers are expensive, they are usually worth the money because you’ll be sure to have a long-lasting sprayer. There are still many quality models that won’t break the bank and counter-checking with our guide can help you land a reliable sprayer.

Amateur gardeners looking for a quality sprayer to use a few times a year can opt for cheaper models which when given proper maintenance, can serve you well for some years. Professional gardeners will be better off investing in a high-quality sprayer that is ideal for extensive use.

That’s it. I hope my guide and each Knapsack sprayer review have provided meaningful solutions to your spraying tasks.

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Last update on 2024-12-03 / Affiliate links / Images from Amazon Product Advertising API