Related: Best Pressure Washer for Driveways and Decks
My pressure washer setup has been rebuilt more times than I care to admit. Twelve years of mobile detailing around Tampa means I have washed driveways in July heat, stripped hulls on a trailer at a boat ramp, and talked more homeowners out of a 4,000 PSI gas machine than I have ever sold them on one. A pressure washer setup is simple once you stop reading the box: real flow, a nozzle that matches the surface, a machine that draws its own soap, and a hose that does not fight you every five feet. Everything past that is marketing.
So this is the setup I would hand a friend. Two machines for two very different jobs, one box of nozzles that costs less than lunch, and a bottle of soap that does more for a car's finish than any foam cannon gimmick. Here is how each piece fits, and who should skip it.
The machine most people should buy: Kärcher K1700
The K1700 is a CETA certified electric unit with three spray nozzles, an onboard detergent tank, and a rated 1.2 max GPM. That flow figure is the honest part of the spec sheet, and it tells you exactly what this machine is for. It is a light-duty washer built for cars, patio furniture, one-story siding, and small concrete pads. It is not a driveway machine, and no amount of PSI marketing changes that.
What earns it the top spot here is the combination of the detergent tank and the three nozzles in the box. Most people shopping at this level end up with a unit that sprays water and nothing else, then wonder why their car still has a film on it. The K1700 draws soap on its own, so you can lay down detergent, let it dwell, and rinse with the same wand. The CETA certification also matters more than people think: it is a third-party flow and pressure rating, not a number printed by the company that wants your money.
The trade-off is speed. At 1.2 GPM you are moving about a gallon a minute across the surface, which is fine for a sedan, a set of patio chairs, or the siding on a single-story wall. Point it at a two-car driveway with years of grime and you will spend the afternoon watching water do very little. That is not a defect. That is the machine being honest about what it is.
The gas machine for real volume: Simpson Water Blaster 4400
The Simpson Water Blaster is rated 4400 PSI at 4.0 GPM with a CRX 420 engine, and the GPM number is the one that matters. Four gallons a minute is more than three times the flow of a light-duty electric, and flow is what actually carries dirt off a surface. Pressure only decides how hard the water feels against your hand.
This is the machine for the jobs that make a driveway look new, for boat hulls, for a moldy fence that keeps coming back, for second-story siding where you want the reach and the volume to finish before your arm gives out. A gas engine also has no duty cycle problem the way a cheap electric does. You can run it for hours.
It is also loud, heavy, and it needs fuel, oil, and a little attention before each season. If you live in a condo, if you wash one car every other month, or if you are not going to store it somewhere you can wheel it out, this is the wrong purchase. Buying too much machine is the most common mistake I see, and it is an expensive one.
The upgrade that changes everything: Tool Daily Nozzle Tips
The nozzle is the machine. I have said that for years and I will keep saying it. The Tool Daily set is 1/4 inch quick connect with multiple spray angles, rated at 2.5 GPM, and it costs about as much as a fast food lunch. It is the single best dollar-for-dollar purchase in this whole article.
Here is why. A 0 degree tip concentrates everything into a pencil-thin stream that will etch concrete and strip paint if you hold it in one place. A 15 degree tip is your stripping and heavy concrete angle. A 25 degree tip is the workhorse for driveways, siding, and fences. A 40 degree tip is your rinse and car-paint angle, and the soap tip is what you use to lay detergent down. Same machine, five completely different tools. A washer with one fixed nozzle is a one-trick pony, and swapping angles is the difference between a clean surface and a damaged one.
The 1/4 inch quick connect is the standard fitting on the vast majority of consumer wands, and the 2.5 GPM rating covers both the electric and gas machines above. If you already own a washer and you are disappointed with it, buy this before you buy anything else. You may find out the machine was never the problem.
Do not skip the soap: KÄRCHER Vehicle Wash and Wax
If it cannot draw its own detergent, it is a hose with a trigger. That is the whole reason the soap function matters, and it is why this bottle belongs in the setup rather than on a shelf. The KÄRCHER Vehicle Wash and Wax is a detergent formulated for pressure washer draw, which means it foams and clings the way it should instead of running straight off the panel.
The bigger point is what not to use. Dish soap is a degreaser, and on car paint it strips wax and can dull trim over time. Pour it into a washer and you are undoing the finish you are trying to protect. A dedicated wash and wax product lets you pre-soak a dirty car, let the chemistry loosen the road film, and rinse it away with far less contact and far less scratching. For a car that only gets washed every few weeks, that dwell time is doing more work than your nozzle is.
How I judge a pressure washer setup
I run every machine and every accessory through the same four questions, and they have nothing to do with the badge on the front.
What is the real GPM? Flow is the work rate. If a unit will not tell you its gallons per minute, it is hiding something, and a weak flow rate cannot be rescued by a high pressure number.
Does it draw detergent properly? A tank on the machine, a siphon tube that does not clog, and a soap tip that actually pulls product. If soap has to be applied by hand, the machine is half a tool.
Are the nozzle, wand, and hose worth keeping? A stiff hose that kinks every five feet will ruin a good machine. A wand that feels like a toy will make you avoid using it. These are the parts you touch constantly, and cheap ones are a daily tax.
Would I finish a full driveway without cursing? That is the practical test. A machine that makes you quit halfway is not saving you money, it is costing you a weekend.
Reference table: what each piece does
| Piece | Job it handles | What the spec says | Price |
|---|---|---|---|
 Visit on Amazon →Kärcher Pressure Washer K1700 |
Cars, patio furniture, one-story siding, small pads | CETA certified, 3 spray nozzles, detergent tank, 1.2 max GPM | $189.99 |
 Visit on Amazon →Simpson Water Blaster 4400 |
Driveways, boat hulls, fences, second stories | 4400 PSI, 4.0 GPM, CRX 420 engine | $1,399.99 |
 Visit on Amazon →Tool Daily Pressure Washer Nozzle Tips |
Matching spray angle to surface | 1/4 inch quick connect, multiple degrees, 2.5 GPM | $6.98 |
 Visit on Amazon →KÄRCHER Vehicle Wash and Wax |
Soap for painted surfaces | Detergent made for pressure washer draw | $14.39 |
Read that table as a shopping order, not a shopping list. Buy the nozzle tips first if you already own a washer. Buy the detergent with the machine, because you will need it the first weekend. Buy the electric if your jobs are cars and small surfaces. Buy the gas machine only if you have a driveway, a boat, or a fence that justifies the noise and the maintenance.
Should you buy the Kärcher K1700?
Yes, for the majority of homes. It is CETA certified, it comes with three nozzles, it draws its own detergent, and it is sized for the work most people actually do: a car, some patio furniture, a walkway, the siding on a one-story house. The 1.2 max GPM is a light-duty flow and it will feel slow on a big slab, so buy it with your job list in mind rather than your ambitions.
Should you buy the Simpson Water Blaster 4400?
Yes, if the jobs are real and recurring. A 4.0 GPM flow with a CRX 420 engine is a professional-grade volume, and it will cut the time on a driveway, a hull, or a long fence by more than half compared to a light electric. It is loud, heavy, and it needs fuel and oil, so it is not the machine for someone who wants to pull a trigger twice a year.
Should you buy the nozzle tips and the wash and wax?
Yes to both, and they are the two cheapest pieces here. The nozzle set turns one machine into five tools, which is the single biggest improvement you can make to any washer. The wash and wax keeps the soap function doing what it is supposed to do on paint instead of stripping the finish. If you are building a pressure washer setup from scratch, these are the two items people skip and then complain about the results.