Model WD1851

Features

  • 6.5 Peak HP Motor – Powerful suction picks up about 1 gallon of water per second
  • Scroll Noise Reduction® is a patented feature that provides quiet operation by precisely controlling the flow of air through the vac
  • Sturdy Cart, Push Handle, & Large Rear Wheels act together allowing the vac to travel easily up & down steps and across rough terrain
  • Quick Release Accessory Storage Bag keeps accessories close at hand but is quickly removable to make emptying debris from drum quick and easy
  • 2-Piece Drum Provides improved, more rugged construction to meet the higher demands found on the job site
  • 3-layer Fine Dust Filter captures fine dust particles such as dry wall dust
  • 7' Dual-Flex® Locking Hose resists collapsing and adds 180˚ flexibility at both hose ends. Hose locks onto vac for uninterrupted cleaning
  • Large Carry Handle allows easy lifting of vac into service vehicle
  • Long 20’ Cord wraps neatly around carry handle
  • Powerful exhaust airstream can be directed through the vac hose to blow debris from garages, decks, and sidewalks

Specifications

Drum Size 16 Gallons (US)
Cord Length 20’
U.L. Listed Yes
Replacement Filters VF3502, VF5000, VF6000, VF7000
Accessory Size 2-1/2"
Shipping Weight 32.8 lbs.
Net Weight 28.2 lbs.

Motor

Peak HP 6.5
Air Watts 306
Voltage 120
CFM 203
Amps 12.0

Rated 4.8 out of 5 by 80 reviewers.
Rated 5 out of 5 by Good product Replaced an old Craftsman vac. This one has about the same suction as the old, but is much quieter. We will see how it holds up. March 2, 2015
Rated 5 out of 5 by Great, Great This Ridgid has great power. I replaced this with another brand , and I'm happy The Home Depot had it on sale. I'm a retired person, so I don't used it much. But it Great February 22, 2015
Rated 5 out of 5 by Lots of suction!! Great product...easy to use. Lots of power. ALOHA! February 15, 2015
Rated 5 out of 5 by Looked at many and chose Ridgid I looked at many different shop vacs in this price range and this was by far the best for the money, in my opinion. I use it in my woodworking shop and I am very happy with it. I replaced the filter that came with it with a disposable filter bag style filter and it works great. February 12, 2015
Rated 4 out of 5 by Design of inlet in tub causes fine dust to plug filter way to fast. Good vac with lots of suck! Only problem is the design of the inlet in tub. It causes all fine dust to be constantly blown around inside wich plugs filter quickly. You can clean filter and then turn in vac and without sucking anything up the filter is plugged in a few min. You can hear the debris blowing around inside. Other than that it's a nice vac. Big caster wheels are a plus February 9, 2015
Rated 5 out of 5 by Would recommend getting auto cleaning kit to go with the vac,longer hose easier to use. Good produce,powerfull and with cart easy to move around, filters are a little expensive but can be cleaned and reused. February 9, 2015
Rated 5 out of 5 by This thing sucks--in a great way!!! I purchased this unit to replace an older Craftsman ShopVac. Wow...no comparison whatsoever! The RIDGID is WAY quieter, has way more suction power, and actually rolls around nicely without tipping over! The cord is super long and I'm able to vacuum my entire 2.5 car garage without relocating the plug! The accessory bag is a great, useable feature that really makes it convenient to store all the things that are nice to have with the vac instead of taking up precious storage space elsewhere in the garage. Another OUTSTANDING example of a quality product by RIDGID. I think the only reason I'd ever buy anything other than a RIDGID is IF they don't make a tool I need...otherwise, I'm RIDGID for life! They rock! February 6, 2015
Rated 4 out of 5 by Good vac, still needs refinement I use a craftsman vac a work and it has at least 1/3 more power and is much quieter. I would have bought it but I need 2 vacs and I wanted to keep the same filters. The oher one I own is the blower/vac. I use the h ell out of them. Very reliable. The tubes do plug up on occasion but I am not sure if that is how I use it or a design flaw. I would give up mobility for a smooth internal tube. February 5, 2015
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2 Questions | 9 Answers

Product Q&A

 
 
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5 months, 2 weeks ago
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Salt Lake City, UT, USA
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Answer: 
Thank you for your interest in RIDGID!

The water lift of WD1851 is 47 inches while the suction power is 199 CFM.

If you have any further questions or concerns, feel free to call us at 1-800-4-RIDGID (1-800-474-3443) or you may send your email to info@ridgidvacs.com.

Regards,
RIDGID
5 months, 1 week ago
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Answer: 
CFM 203
3 months, 1 week ago
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Michigan, USA
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Answer: 
203 cfm
3 months ago
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New York, United States
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Answer: 
200+ CFM and it will move 1 gallon of water a minute, this I have done myself
2 months, 2 weeks ago
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Hulett, WY 82720, USA
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Answer: 
1/203
2 months, 1 week ago
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Madera, CA, USA
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Answer: 
20 pounds, maybe more. CFM 160
1 week, 2 days ago
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Worthington Springs, FL, USA
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3 answers

Pressure

If a airwatts are 0.117354 * (CFM) * (inches water), then do I calculate correctly that this model no. WD1851 will lift water 12.8 inches high?

306 watts * (1/0.117354) * (1/203 CFM) = 12.8 inches of water

I feel like that number is way too low - I'm sure your product lifts water more than 1 foot high! I may have the calculation wrong or the pressure may be specified another way. What do the units of "G/h" mean?

Besides, it seems like an odd coincidence that this is almost exactly the inches for model WD4070 when the WD4070 is rated 5.0 peak HP and the model on this page is rated 6.5 peak HP.

Thank you for the help.
1 year, 2 months ago
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Indiana, USA
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Answer: 
According to our Product Manager, You need to first think of CFM and Inches of water lift in inches as two different and inversely related measurements. To maximize CFM, you need a wide open path with as little resistance as possible to move as much air as possible. To maximize inches of lift (or better recognize or measure) that flow of air needs to be restricted, or blocked. So to assume that our machines generate 203 CFM and 49 inches of lift at the same time is a miss-conception. The calculation you completed was “at 306 air watts and 203 CFM, what are the inches of lift being produced”… and the answer is 12.8. Essentially, you’ve identified the inches of lift at the rated max CFM and Air Watts. For example, if you solved for CFM at max inches (say 49) you get a really small CFM number, somewhere below .2 CFM. This is because at max inches (the hose is blocked) and there is “no” air moving through the hose.

We hope this helps. Have a good week ahead!

Thank you
RIDGID
1 year, 2 months ago
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Answer: 
Thank you, RIDGID! That really helped me understand how the pressure and CFM are related, and the calculation result of 12.8 inches makes sense now. I didn't realize the airwatts equation was NOT referring to "sealed" inches of water. Now I see why using sealed inches for calculating airwatts wouldn't make any sense.

You mentioned 49 inches a couple times. Is that the sealed lift this vacuum is rated for? If not, would you please share the max water lift rating?

Thank you again.
1 year, 2 months ago
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Indiana, USA
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Answer: 
You are right it would lift water more like 10 ft.
3 weeks, 2 days ago
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Langton, ON N0E, Canada
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