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Simpson CM61083 Review

Though powerful, this pressure washer doesn't live up to its hype
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Simpson CM61083 Review
Credit: Simpson
Price:  $400 List
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Manufacturer:   Simpson
By Clark Tate ⋅ Senior Review Editor  ⋅  Aug 10, 2023

#6 of 9
  • Cleaning - 45% 9.7
  • Portability - 30% 3.0
  • Noise - 15% 2.6
  • Ease of Use - 10% 5.5

Our Verdict

The Simpson CM61083's pure, raw power is impossible to deny. It shoots water quite well. But our independent pressure tests show that it doesn't live up to Simpson's sky-high pressure claims, as we measured a psi of with a PSI of 2100. An unfortunate lack of ergonomics and clumsy storage options for the spray gun and hose makes it a bear to move around. It's also loud, making for a package that annoyed us more than impressed us. We recommend checking out other models in our best pressure washer review.
Powerful cleaning
Large pneumatic tires
Awkward to move around
Not as powerful as advertised

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Simpson CM61083
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Price $400 List
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Bottom Line Pure cleaning power can't make up for this model's lack of mobilityNo job is too tough for this high performance gas-powered pressure washerGood at cleaning and easy to carry, this is a high-value optionWe recommend this device for those that are searching for a pressure washer sans fossil fuelIf you want a model that performs decently but won't take a toll on your bank account, this model is a great choice
Rating Categories Simpson CM61083 Westinghouse WPX3200 Wholesun 3000PSI Sun Joe SPX3500 SunJoe SPX3000
Cleaning (45%)
Portability (30%)
Noise (15%)
Ease of Use (10%)
Specs Simpson CM61083 Westinghouse WPX3200 Wholesun 3000PSI Sun Joe SPX3500 SunJoe SPX3000
Calculated Cleaning Units with 15º Nozzle 4968 5980 1452 1782 1464
Electric or Gas Gas Gas Electric Electric Electric
Overall Size 31" x 27" x 21" 38.5" x 25.5" x 19.75" 27" x 10.5" x 9.5" 35.5" x 16" x 15" 34" x 13.5" x 17.5"
Nozzles Available 0°,15°, 40°, and soap 0°, 15°, 25°, 40°, soap 0°, 15°, 25°, 40°, and soap 0°, 15°, 25°, 40°, soap 0°, 15°, 25°, 40°, soap
Measured 15º Nozzle Pressure 2300 psi 2600 psi 1200 psi 1650 psi 1200 psi
Measured 25º Nozzle Pressure N/A 2600 psi 1200 psi 1600 psi 1150 psi
Measured 15º Nozzle Flow 2.16 gpm 2.3 gpm 1.21 gpm 1.08 gpm 1.22 gpm
Measured 25º Nozzle Flow N/A 2.34 gpm 1.22 gpm 1.09 gpm 1.2 gpm
Wheels 10" Pneumatic Tires 12" Plastic 5" Plastic 8" Plastic 7.5" Plastic
Average Measured dBa at Machine 93.0 dBa 83.2 dBa 73.3 dBa 70.0 dBa 83.8 dBa
Average Measured dBa at 25 ft 74.0 dBa 68.0 dBa 67.3 dBa 65.2 dBa 61.4 dBa
Length of Included Hose 26' 6" 25' 20' 3" 20' 20' 3"
Electrical Cord Length N/A N/A 32' 5" 30' 35' 3"
Measured Weight 67.6 lbs 63.6 lbs 16.3 lbs 42.6 lbs 28.2 lbs
Measured Distance in Bocce Ball Power Test 7.0' 6.5' 3.0' 3.0' 3.5'
Manufacturer Pressure 3,400 psi 3,200 psi 2,150 psi 3,000 psi 2,030 psi
Manufacturer Flow 2.50 gpm 2.50 gpm 1.58 gpm 1.48 gpm 1.76 gpm
Calculated Manufacturer CU 8500 8000 3397 4440 3572.8

Our Analysis and Test Results

Advertised as an incredibly powerful pressure washer, the Simpson didn't quite live up to its advertising in our tests. It's also loud, clunky, and hard to move around.

Performance Comparison

The powerful Simpson always starts up on the first pull.
Credit: Abriah Wofford


The most important task of a pressure washer is to clean well, and the Simpson does a decent job. It's among the highest scorers in our cleaning speed, cleaning unit, and bocce ball blasting tests.

To test cleaning speed, we shake a thick layer of activated charcoal over a white carpet and time how long it takes to clear the dark coating using the washer's 15º nozzle. The Simpson demolished the task, blazing through the grime to show strips of clean-looking carpet. It was among the very best performers in this test, taking less than three minutes to remove most of the charcoal.

So far, so good. In the next step of testing, we measure each washer's cleaning units. Using an independent gauge to measure the water pressure (pressure per square inch, or PSI) and a bucket and stopwatch to measure how many gallons it pumps out per minute (GPM). We measured 2,300 PSI and 2.16 GPM using the 15º nozzle.

simpson cm61083 - it cleans well, but our pressure measurements don't match the...
It cleans well, but our pressure measurements don't match the company's claims.
Credit: Abriah Wofford

Simpson claims that it produces 3,400 PSI at 2.5 GMP. We didn't find that to be the case, though we tried the test with other nozzles as well. This unit comes with 0, 15, and 40-degree nozzles and a soap nozzle. The 0º is the most directed and abrasive and should have the most pressure. When we measured it, we recorded only 2,500 PSI.

So, while the 15º nozzle produces an impressive 4,968 cleaning units and is among the top scorers in the test, it's not the best. And many other washers came closer to their manufacturer's claims.

The last cleaning test is another gauge of raw force. We use each machine to roll a bocce ball up a 24 to 26-degree ramp. This is where the Simpson really shined, blasting the ball to 7 feet, which is one of the best results we've seen.

The Simpson catapulted the bocce ball to 7 feet, the highest point reached in testing.
Credit: Abriah Wofford


The Simpson did not shine in our portability tests. At 67.6 pounds, it's among the heaviest units we've tested. It has one of the largest footprints at 567 square inches. And the wand rests at an angle that gets in the way when storing or moving it around.

It does have large 10-inch pneumatic, or inflatable, tires. They roll over obstacles well, but it's hard to balance the washer's weight over them. Instead of moving like a hand truck, where you rock it back to balance the weight over the tires, this pressure washer moves like a wheelbarrow. You have to pick up the weight with a bicep curl to roll it.

Some pressure washers are harder to move around than others.
Credit: Abriah Wofford

Unlike a wheelbarrow, it's hard to grip this machine and walk at the same time. The handle is awkward. When maneuvering in and out of the lab, we were constantly knocking into things. It's so hard to roll that it regularly bumps our heels, leaving our feet with flat tires. It's not terrible. The other options are just much better.

simpson cm61083 - the wand storage places it at an angle that can run into obstacles...
The wand storage places it at an angle that can run into obstacles if you aren't careful.
Credit: Abriah Wofford


Gas-powered pressure washers tend to be loud. This one is louder than most. When we measured decibel levels (dBA) beside it while it was running, they registered at 93 dBA. Twenty-five feet away, they were 74 dBA. It's not quite as loud when idling, but unlike electric options, the noise doesn't stop as long as it's running.

simpson cm61083 - our decibel meter shows a reading of 93 dbas, which is too loud in...
Our decibel meter shows a reading of 93 dBAs, which is too loud in our opinion.
Credit: Abriah Wofford

Ease of Use

Though we don't love lugging this large and cumbersome pressure washer around, it's not hard to use once you get it to its destination. The motor generally starts up on the first pull and usually runs smoothly. A few times, it shut off for no known reason during a test. It fired right back up, but we haven't experienced this issue with other washers.

Small gas-powered engines require more care and maintenance than their electric counterparts. You'll have to buy gas (though we ran all of our tests on a half tank), change the oil and air filter every 50 hours, and the spark plug after 100 hours of use. You'll also have to stabilize it for winter or long-term storage.

simpson cm61083 - there is enough room around the water input to tighten a hose with...
There is enough room around the water input to tighten a hose with minimal annoyance.
Credit: Abriah Wofford

Attaching a water hose is straightforward, and the port is above the spray hose, making it easier to access. It's also nowhere near the engine, so you don't need to worry about burns. You can add soap using a siphon hose. Just place the small and clear input into a bucket with soap in it. This makes for easy cleanup but is a pain if you need to move around.

simpson cm61083 - a clear siphon hose adds soap to the water output, if you have a...
A clear siphon hose adds soap to the water output, if you have a bucket to put it in.
Credit: Abriah Wofford

The spray hose is coated in grippy rubber. It works pretty well while in use but is prone to tangling and can be difficult to coil when you're done. There's a strap below the handle that stores the hose for you. We find it difficult to use when one hand is holding the coil. When you unstrap it, the entire hose falls, forcing you to recoil the entire thing. We prefer versions with an easy-to-use static hook.

The strap holding the hose in place is a little less user-friendly than a hook.
Credit: Abriah Wofford

Each nozzle has a dedicated slot in a caddy just below the handle. They rest at an angle though and slide out on occasion. A color-coded infographic on the washer's name plate is easy to understand, showing you the differences between the nozzles.

This machine is very stable, holding its weight low to the ground. When rolling it around or tugging on hoses, we never had the feeling that it might tip over.

simpson cm61083 - low to the ground, this unit is very stable.
Low to the ground, this unit is very stable.
Credit: Abriah Wofford

Should You Buy the Simpson CM61083?

Because it's so large and cumbersome, we don't recommend the Simpson. If you're not planning to move it much and find it at a great discount, this could make it a good option.

simpson cm61083 - large and cumbersome, this machine offers its cleaning power at a...
Large and cumbersome, this machine offers its cleaning power at a high price.
Credit: Abriah Wofford

What Other Pressure Washers Should You Consider?

If you need the strength of a gas-powered pressure washer, we recommend the Westinghouse WPX3200 Pressure Washer. It cleans just as well as the Simpson but is quieter, lighter, and easier to move around. We also like the Generac 8874. It's a bit less powerful but is compact and easier to use than the other two.

simpson cm61083 - the simpson shines when it comes cleaning power.
The Simpson shines when it comes cleaning power.
Credit: Abriah Wofford

Clark Tate