PowerSmart PSMB21P Review – 21-inch Gas Powered Push Lawn Mower

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PowerSmart PSMB21P Review
PowerSmart PSMB21P
Performance/Cut Quality
What I Like
3 in 1 – Cut & Collect, Side Discharge & Mulch Option
Five adjustable cutting heights
Foldable handle
3-year warranty
Strong steel deck and blades
What I Don't Like
No roller for a striped lawn
Not self-propelled
My Overall Rating


PowerSmart PSMB21P Review

The PowerSmart PSMB21P gas-powered lawn mower is ideal for medium to large lawns thanks to its large cutting width of 21 inches. Not only this, but the innovation that has gone into creating this piece of yard equipment is evident when we look at the design and features that it boasts.

While being a powerful gas mower, this machine has been designed with tight spaces in mind and will reach all areas of the yard with ease, saving you time and effort. Furthermore, it is a 3-in-1 lawn mower that has the ability to mulch, collect grass clippings in the large collection bag or side discharge.

With adjustable height settings and foldable handles, it isn’t difficult to see why this is an exceptionally easy machine to use, at the same time as being super-effective thanks to the powerful 170cc 4-stroke engine.

Main Features

  • Gas powered lawn mower
  • 21-inch cutting width
  • Five adjustable cutting heights
  • 170cc engine
  • 3-in-1 side discharge, mulching, cut and collect
  • 14.6 gallon grass box
  • Steel deck
  • Foldable handle
  • 12-inch rear wheel


PowerSmart PSMB21P Engine

The PowerSmart PSMB21P lawn mower is powered by a 170cc 4-stroke engine, which is ideal for those tougher challenges such as long or coarse grass. What’s more, a 4-stroke engine has some serious benefits, including a much quieter function than the 2-stroke. In addition to this, a 4-stroke engine puts out fewer emissions, making them a slightly greener choice for those who want the power of gas without leaving too much of a carbon footprint.

If all of that wasn’t enough, there is another huge advantage of using a 4-stroke engine, and this is that they are far easier to maintain. One of the things that can put people off using a gas mower is that when it comes to fixing them, they may be a challenge, but this won’t be as much of an issue with this type of engine.

There is also a forced air cooling system to keep the engine running smoothly throughout the entire job. You will also benefit from the 0.21-gallon fuel tank.

Now this engine is not a Honda or Briggs & Stratton engine, but for domestic use and the value for money, there is no reason that this engine should not last long and function well for its user.

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Owing to the ornate power of this lawn mower, you will notice how easily it glides across all types of terrain. No matter if the grass is thick and tall, the PowerSmart will make light work of it.

This makes it ideal for those times of the year where the grass may grow a little more densely, or if you have not trimmed it for some time.

Furthermore, the slimline design means that there will be fewer areas of the lawn that can’t be reached.

Blade And Deck

PowerSmart PSMB21P Blade And Deck

You want to be sure that your lawn mower is robust and durable, and this is perfectly achieved with this model thanks to the hefty steel deck, which provides added durability and strength to the overall design.

The wide deck boasts a very generously-sized 21-inch steel blade, which is sharp and solid, making it ideal for larger lawns.

Cutting Diameter

This PowerSmart PSMB21P gas-powered lawn mower has a wide cutting diameter of 21 inches. Not only will this make mowing medium or large lawns far easier and much quicker, but it will also mean that more grass is covered in each pass. You will therefore get the job done much quicker.


One of the most important things when it comes to purchasing any type of lawn mower is that you are effectively able to store it, and in this case, it couldn’t be easier. Not only does it have a relatively compact design, but it also features a foldable handle, which makes popping it into an outbuilding or shed simple and easy.

The start/stop lever is conveniently located on the handle for greater ease of use, which is perfect for getting the job done without hassle.

Height Adjustment

Depending on the time of year, you will need to cut your grass slightly shorter or longer, and this is not an issue when purchasing this lawn mower.

Primarily, this is down to the adjustable cutting height, which can be easily moved from one position to another, allowing you to choose from five cutting heights ranging between 1.18” and 3.0”.


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Mowing Features

PowerSmart PSMB21P Features

As I have mentioned, this PowerSmart PSMB21P is a 3-in-1 lawn mower, which means that the way you cut the lawn and dispose of the grass clippings is varied and versatile.

As with most gas-powered mowers, you have the option to collect the clippings in a handy grass collection box, which can then be easily emptied. Alternatively, you may select to use the mulching plug or the side discharge chute, giving you more control over the way you mow your lawn.


Mulching is great if you want to give the nutrients back to the grass. This method of mowing allows you to deliver the clippings back to the grass, where they will provide it with nutrients and will help in the prevention of weeds. The mulching process will result in a much healthier, greener and thicker lawn.

Grass Box

Since this lawn mower has a very large cutting width, it would be fitting that it also features a large grass collection box; and you won’t be disappointed. The PowerSmart mower offers an incredible 1.4-bushel grass box – that’s around 14.6 gallons, so you have plenty of space to store the grass clippings whilst mowing to finish the job.

When you are ready to empty the clippings, the grass box has been designed with ease of use in mind, and thanks to the labor-saving design, getting rid of the clippings has never been easier.


PowerSmart PSMB21P Practicalities

In terms of how practical this PowerSmart PSMB21P mower is, you can feel confident that you will be getting a piece of equipment that is easy and efficient to use.

To start with, it is hard to ignore the 3-in-1 nature of this machine, which makes it diverse and suitable for use at any time of year. Furthermore, it is easy to store thanks to the foldable handle and compact design.

If you like a little bit of added stability when mowing the lawn, then the larger 12-inch rear wheels will provide you with that.

But what is even more impressive is the 3-year warranty, which gives you the confidence that in the unlikely event that anything goes wrong, you won’t be left without a mower.

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What’s Included In The Box

  • 1 x PowerSmart PSMB21P gas lawn mower
  • 14.6 gallon grass box
  • Side discharge chute
  • User manual

Pros and Cons

  • Large cutting width
  • Five adjustable cutting heights
  • 3-in-1 option including Cut & Collect, Side Discharge & Mulch Option
  • Huge grass collection box
  • Foldable handle
  • 12-inch rear wheels for added stability
  • Strong steel deck and blades
  • 3-year warranty
  • No roller for a striped lawn
  • Heavy at 62lbs
  • Not self-propelled


Should You Buy This Model?

If you are in the market for something that is easy to use and diverse, then the PowerSmart would indeed be an excellent choice. It would ideally suit someone who didn’t need a self-propelled mower and who wants to get outside and get the job done as quickly and efficiently as possible.

PowerSmart PSMB21P Conclusion

If you have a larger yard, then you need a mower with a decent cutting diameter, and at 21 inches, this one would serve you well. What’s more, if there are any tight corners or narrow parts of the lawn, you would be more easily able to access them with the compact yet powerful mower such as this.

This would also work very well for anyone who wants the power of a gas engine without the hassle of too much maintenance. Since the mower features a 4-stroke engine, you will get all the benefits of gas but without the hassle of continued and complex maintenance.

My only slight concern is the durability of the components. PowerSmart mowers are such good value and as we all know, you do get what you pay for. The feel of the metals and plastic is not the best I have seen, however they are perfectly adequate for domestic use.


PowerSmart PSMB21P Pros and ConsGas lawn mowers are and have always been a powerful and reliable type of mower, that doesn’t disappoint where performance is concerned. But when you package that with modern technology, value and innovation, you get something like this PowerSmart lawn mower that is perfect for today’s modern domestic gardener.

It boasts a wealth of features such as a wide cutting width and five cutting heights, as well as the ability to mow in three different ways. If you need something diverse, this is a model worth considering.

It is easy to use, easy to store, and will cut the lawn precisely and effectively. Overall, I’m seriously impressed with this mower and its value for money, and I don’t doubt that you will be too.

Where Should I buy this PowerSmart PSMB21P?


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PowerSmart Lawn Mower Gas Powered, 21-inch & 170CC Gas Lawn Mower with 4-Stroke Engine,...
  • 【21-INCH MOWING DECK】 equipped with powerful 170cc 4-stroke gas engine, pull to start in a snap. 7" front wheel and 8" rear wheel designed, most labor-saving for flat terrain.
  • 【ADJUSTABLE CUTTING DEPTH】 the self-propelled mower has 5-position height adjustment from 1.2" to 3.0", allow you customize the look and feel of your lawn. Turn your grass into the nicest lawn on the street.
  • 【3 in 1 Lawn Mower】 side discharge, mullching capabilities, rear bag discharge, helps you control the nutrients put back into the soil. With rear bag the mower can collect dead-leaves and grasses, clean up your lawn while mowing.
  • 【QUICK FOLDING & TIDILY STORAGE】 can be quickly folded without tools due to the foldable handle design. It can be stored tidily after folding, save space and keep your work house organized.
  • 【Tips】 add oil for first time use. Recommend 12floz, 10W-30 Oil. PowerSmart lawn mower covered a 3-year-limited-warranty. Our service team will provide premium service to help solve any problem.

Last update on 2024-03-28 / Affiliate links / Images from Amazon Product Advertising API


Powersmart PSMB21P FAQ

Does the PowerSmart PSMB21P have an electric start option?

No, it is recoil start only.

Is the PowerSmart PSMB21P self-propelled?

No, push only.

Are there multiple levers to adjust the height?

No, a single lever mounted at the rear of the mower.

Does the PowerSmart PSMB21P come with a mulching plug?

No, a mulching plug is not supplied.

Does the PowerSmart PSMB21P come supplied with oil?

No, oil will need to be purchased separately.

Not sure about this Gas Powered Lawn Mower? Click here for more Gas Powered Lawn Mower reviews. 

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