Wilks-USA TX850 – Super-Powerful Petrol 15HP Pressure Washer

(13 customer reviews)


This top of the range Wilks-USA TX850 High-Pressure Washer is undoubtedly the market leader in the “big washer” category with unrivalled power and features, and all this at the price of a much smaller washer.

The TX850 is an industrial spec machine that’s designed to be suitable for domestic use too. This 15hp Pressure Washer is the top performer in its class, yet it’s still manoeuvrable due to its heavy-duty wheels and clever design.

When you combine a Wilks 4-stroke OHV 450cc engine with an ultra-durable Wilks pump, you get unbeatable reliability

The TX850 produces a massive 4800psi of pressure making this ideal for those looking for a pressure washer with industrial uses. 

The TX850 also makes light work of household jobs such as cleaning cars, boats, paving, decking, roofs etc. There are five included colour coded quick fit “Snap-in” nozzles allowing different spray arcs for different applications allowing you the correct tools for every job.

Simply switch to the appropriate nozzle to go from light cleaning to stripping those hard to clean footpaths and drives, you can further adjust the pressure using the regulator on the pump.

Get up and running in a flash with the handy quick start guide – set up fast and clean up faster with this monster piece of kit!

Have a question? Contact our friendly, expert Wilks-USA qualified staff here


343 in stock (can be backordered)

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Free UK Delivery

To Mainland UK. Same day dispatch on orders placed before 14:00 GMT. Full Shipping Terms.

1 Year Warranty

Your new Wilks USA Pressure Washer comes with a 1-year warranty, as well as UK based technicians & an expert technical customer service team on hand to assist with any queries that you may have, before and after purchase.


Unbeatable Performance and Reliability

The TX850 is the ideal choice for commercial operators and for any other application where time is money. With its powerful 450cc 15HP motor it has the grunt to produce a massive 4800psi, making this washer one of the most powerful in its class, reducing working time by up to 75% over smaller lesser units.

The 20-metre commercial wire braided pressure hose is ultra-durable and allows you a massive reach without having to constantly move the machine whilst maintaining that huge pressure to get the job done in double-quick time. Its large, thick pneumatic wheels allow you to easily manoeuvre this beast over the toughest terrain.

High-Pressure Output, Low Fuel Consumption

The TX850 15hp Pressure Washer produces a remarkable 4800 PSI at 331 Bar from a quality Wilks 4-stroke OHV 450cc Engine. Wilks has created a superior design that outperforms other pressure washers. The huge power output means that you will complete cleaning in a fraction of the time and with low fuel consumption to keep running costs to a minimum.

Quality Brand, Fantastic Reputation

Wilks create their pressure washers with you in mind, making cleaning chores are a breeze – leaving you free to enjoy yourself!


  • Engine: 15HP OHV 4-Stroke
  • Displacement: 450cc
  • Maximum Output: 15HP / 3600RPM
  • Maximum Pressure: 4800PSI / 331Bar
  • Continuous Pressure: 3600PSI / 240Bar
  • Starting System: Recoil Pull Start
  • Fuel Tank Capacity: 5.0L
  • Fuel Type: Regular Unleaded 95+ RON
  • Pump Type: Full Brass Head Pump
  • Flow: 14L/min
  • Max. Water Temperature: 50 C
  • Oil Capacity: 1.1L
  •  Oil Type: 10W 30 / 10W 40

In The Box

  • TX850 Pressure Washer
  • 1 x 20 Metre Hose
  • 1 x High Pressure Gun
  • 1 x Straight Lance
  • 1 x Inlet Hose with Filter
  • 1 x Turbo Nozzle
  • 5 x Nozzle Attachments
  • 5 x Set of Bolts and Fittings
  • 1 x User Manual

Wilks Ultra Durable Pump

When you combine a Wilks 4-stroke OHV 450cc engine with an ultra durable Wilks pump, you get unbeatable reliability. Featuring an anodized crankcase, forged brass cylinder, fully adjustable pressure and quick connectors.

When you buy Wilks, you will get the very best design and materials.

Variety of Click & Go Nozzles

This comes with 5 ‘click and go’ nozzles, each with a specialised function. The red is for blasting, yellow for stripping, green for cleaning, white for washing and blue for detergent application. With Wilks, you will be able to clean almost anything.

Massive Power, Transportable

This pressure washer defines what is possible from a pressure cleaning machine. The unit features large heavy duty travel wheels to make moving the unit so easy. Also the handle folds down to allow for easy storage.

Feed from a Tap or Pond

Suitable for use almost anywhere with the functionality to feed with water from a tap, bucket or pond. A hose and filter system is included to keep debris out and protect the engine.

Robust, Heavy Duty Build

Designed with durability in mind. This pressure washer has a solid steel frame. Also, with an automatic stop/start pump, you can be sure to only get the water flow when you need it.

20 Meter High Pressure Durable Hose

This comes with a 20 meter high pressure hose so you have plenty of reach. With the long reach you can spend more time cleaning and less time moving the unit.

Shipping Information

Shipping – Fast & Free

We offer free shipping mainland UK (excluding Highlands/Grampians), on all orders under 70kg weight.

Your postage will be calculated when you enter your postcode at the checkout.

We use a variety of reliable 24-hour courier services on all of our machines – the courier depends on weight and locations. Parts & accessories are sent with Hermes Tracked Delivery.

Orders placed before 2pm on a weekday are dispatched the same working day.

User Manuals

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13 reviews for Wilks-USA TX850 – Super-Powerful Petrol 15HP Pressure Washer

  1. Sean

    Had a little problem at first, would cut out after 5 mins, found the problem, the fuel bowl bolt was loose and sucking air, secured ran absolutely brilliant machine, fantastic power, this is a beast of a machine, nice 5ltr tank,looking forward to using it more.
    Another note for the novice user, release water pressure from gun, the machine pull start works a whole lot easier.
    Very happy so far.

  2. Scott G

    Had to send back as it was a bit too powerful for my needs.

    I can’t give it a proper review for this reason, but I can say the customer support was very reasonable and allowed me to return.

  3. Henrik B

    Easy to sample, added oil and petrol and started first time. Substantial piece of machinery but 4 wheels makes it easy to position where needed. Impressive pressure with a variety of attachments making this a very useful tool for all sorts of cleaning jobs.

  4. Mckenna A

    If I had to be picky I would say the cord is a little hard to pull, but maybe that is just me getting old.

    No cheap plastic parts, a metal pump and proper rubber wheels not those plastic rubbish ones you normally see these days. A Proper American Brand.

    Reminds me of how tools and machinery used to be made, although I can only speak for this particular model.


  5. O’Neil

    Highly recommended to any fellow farmers who may be looking for something with a bit more power than what you can buy on the high street. Electrical cord is a reasonable length and you can feed it straight from a barrell which has turned out to be useful for us as we don’t have hose connections on some parts of the land.

  6. Colchester

    As my dad used to say, BUY CHEAP BUY TWICE.

    After getting ripped off previously from a ‘national’ brand we decided to spend the money on something a little more expensive. I am extremely pleased we did. There’s a reason most of the reviews mention the power…

  7. terrence

    As others have said this is most suitable for business/industrial use… I wouldn’t use this on your flowerbeds..

    We have used a variety of makes/brands over the years and (so far at least) this has got to be my favorite.

    The build quality is exceptional and the wheels are very sturdy. We’ve been using this for about 2 months now on a almost daily business and I am happy to report there is no noticeable loss of power.

  8. Keeton

    Arrived the next day and so far so good.

    Probably the most powerful ‘portable’ pressure washer I have ever used for my cleaning business.

    Only time will tell how durable it is.

    Definitely recommended for anyone looking for something with high power

  9. Jack M

    Bought this as a replacement for an old pressure washer I had and the only thing I can say is WHAT A BEAST. Works perfectly for what I use it for.

    Although the TX850 is perfect for me I would say it is not a great buy if you are only going to use it for household chores – I would recommend one of the less powerful ones.

  10. Neil Mitchell

    Excellent power washer and a fantastic price a serious bargin

  11. Hughie


    Without a doubt the most powerful pressure washer I have ever used.

    Cleaned all of our farming machinery in no time at all and was surprisingly easy to move around.



  13. Peter Thornton

    Excellent Product. Service was first class from Union Mart.

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