REASONS TO BUY
Long battery life
HEPA rated filter
Well-designed floor attachment
REASONS TO AVOID
Poor suction
Poor airflow
Loud
DeWalt DCV581H Review
A sharp-looking machine that leaves a lot to be desired in the suction and airflow departments
Credit: Laura Casner
Our Verdict
The DeWalt 18/20V MAX is an interesting wet/dry machine that has many innovations that would otherwise be quite appealing except that the machine isn't very good at, well, vacuuming. The MAX struggled in both the wet and dry vacuuming analyses, as well as much of the convenience evaluation. That said, this machine does have one heck of a battery life, and it accommodates both 18 and 20-volt batteries. However, it is so poor at picking up unwanted debris that the value of these components is moot. Check out our full cordless wet dry vacuum review to see which models we loved.
Editor's Note: This product review was updated on January 11, 2022, with information on what we like about this product and a more in-depth comparison between products.
Compare to Similar Products
 This Product DeWalt DCV581H | |||||
|---|---|---|---|---|---|
| Awards |  Best All-Around Wet Dry Vacuum | Best Toolbox-Style Wet Dry Vacuum |  Best Bang for the Buck | A Great Value | |
| Price | $160 List $143.85 at Amazon | $99 List $93.93 at Amazon | $150 List $121.00 at Amazon | $100 List | $119 List |
Overall Score  |
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| Star Rating | |||||
| Bottom Line | A well-designed vacuum except for the fact that it has poor suction and airflow | This machine performed well across the board but particularly in wet clean-up and runtime | A compact, powerful tool that can handle just about anything | This competitively priced vacuum is powerful and efficient but lacks in battery life | An affordable vacuum that is tough on wet and dry messes |
| Rating Categories | DeWalt DCV581H | Craftsman CMCV002B | Milwaukee M18 0880-20 | Kobalt KWDV 0124B-03 | Ryobi P3240 |
| Dry Work (40%) | |||||
| Wet Work (30%) | |||||
| Battery Life (20%) | |||||
| Convenience (10%) | |||||
| Specs | DeWalt DCV581H | Craftsman CMCV002B | Milwaukee M18 0880-20 | Kobalt KWDV 0124B-03 | Ryobi P3240 |
| Measured height x width x depth (inches) | 12 3/4" x 16 1/2" x 12" | 13" x 18 3/4" x 10 1/2" | 12" x 16 3/4" x 8 1/2" | 13" x 17 1/2" x 10 3/4" | 9 1/2" x 18 1/2" x 12" |
| Measured weight (w/o battery) | 9 pounds, 2 ounces | 7 pounds, 8 ounces | 10 pounds, 2 ounces | 10 pounds,12 ounces | 8 pounds, 6 ounces |
| Measured runtime (minutes) | 40 min | 34 min | 23 min | 20 min | 19 min |
| Measured hose length min/ max (inches) | 21" - 82 1/2" | 26" - 94" | 24" - 90 1/2" | 24" - 96" | 20 1/4" - 84" |
| Attachments | crevice nozzle, wide nozzle | crevice nozzle, wide nozzle | crevice nozzle, floor nozzle | crevice nozzle, floor nozzle | utility nozzle, crevice tool |
| End of hose diameter (inches) | 1" | 1" | 1" | 1 1/16" | 1" |
| HEPA rated filter | Yes | Yes | Yes | Yes | Yes |
| Canister volume (gallons) | 2 gal | 2 gal | 2 gal | 3 gal | 3 gal |
| Washable filter | Yes | Yes | Yes (dry only) | Yes | Yes |
| Battery (volts) | 18/20v | 20v | 18v | 24v | 18v |
| Measured suction (inches of water lift) | 16" | 19" | 25" | 22" | 22" |
| Battery life indicator on machine | On select batteries | On select batteries | On select batteries | On select batteries | On select batteries |
| Blower feature | Yes | Yes | Yes | Yes | Yes |
| Tool connection adaptor | Yes (sold seperately) | No | Yes (sold seperately) | No | No |
| Auxiiary power cord | Yes | No | No | No | No |
| Dry sawdust clean-up (seconds) | 25 sec | 15 sec | 13 sec | 13 sec | 15 sec |
| Wet sawdust clean-up (seconds) | 85 sec | 42 sec | 36 sec | 51 sec | 42 sec |
Show full specification detailsHide full specification details
Our Analysis and Test Results
The main features that make this model a standout in its cohort are its effective floor tool attachment, long runtime, a battery adaptor. It can handle either an 18 or 20-volt DeWalt battery cell and has an auxiliary power cord. Unfortunately, the accolades stop there. However, this model's exceptionally poor suction and airflow are more memorable, which means it's not very good at vacuuming. Added to the poor vacuuming is a super-high price, providing good reasons to look elsewhere for a cordless shop vacuum.
Performance Comparison
It's all about the air channels. This well thought out floor attachment keeps the air flowing and the sawdust moving.
Credit: Laura Casner
Likes
At 39 minutes, 40 seconds of runtime on a 20-volt, 5 amp-hour battery, the DeWalt 18/20V MAX offers one of the longest-lived batteries in the class. A real positive, to be sure. It's also an advantage that the machine has an 18-volt adaptor that will allow the user to run either battery type. Additionally, the DeWalt has an auxiliary power cord — a nice touch for prolonged jobs. We like the included HEPA-rated filter, which helps keep the air a bit cleaner.
This machine will accommodate the brand's 18 and 20-volt batteries. So, if you already own DeWalt cordless tools, you're all set.
Credit: Laura Casner
Another advantage that the DeWalt offers is a floor attachment tool that works well on hard surfaces. Despite this model's minimal suction and airflow, the gaps in the contact surface of this attachment allow the air to keep moving and the unwanted liquid or debris to shoot up into the canister.
Dislikes
The overriding problem with the 18/20V MAX is that its motor is incredibly underpowered for the tasks it's intended to tackle. We could go into all the vacuuming tests that this machine flopped. However, it's more telling to state the machine's suction and airflow stats. We tested the unit's suction — which is measured in the number of cubic inches of water lift the motor can produce. The DeWalt checked in at an abysmal 16 inches water lift. Yikes!
This machine's airflow is also quite low. The manufacturer's rating is 31 cubic feet per second, a rate that is at the bottom of the class. Contrary to popular belief, suction alone does not a good vacuum make. It is the combination of suction and airflow that moves unwanted items from the floor up into the vacuum canister. So, the fact that this model has poor suction and airflow goes a long way in explaining why it performed poorly in most of our wet and dry vacuuming evaluations.
Should You Buy the DeWalt DCV581H?
This machine may catch your eye because of the well-known DeWalt name brand. However, we were disappointed in the overall performance of this vacuum. Paired with its higher-than-average price tag, we do not think this is the right vacuum for most people. We recommend looking elsewhere for your project cleanup tools.
What Other Cordless Wet Dry Vacuum Should You Consider?
The DeWalt is one of the lowest scoring vacuums in our review, so you can purchase almost any other machine and come back with better results. Some of our favorites include the Craftsman CMCV002B, which has above-average results in almost every metric, and the Kobalt KWDV, which has one of the top dry work scores combined with a lower price tag.
—Nick Miley and Austin Palmer
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