Best pressure washer for patios and pavers

A paver patio is not one surface. It is a few hundred separate stones held in place by the sand between them, and that sand is softer than anything a pressure washer is usually pointed at. The failure mode here is not a damaged paver, it is a joint that is no longer there.

The short answer

What the paver makers actually publish

We went looking for a safe PSI. Two major manufacturers publish cleaning guidance and neither states one.

• Unilock publishes an angle: "Spray water on the surface using a hose or power washer at an angle no greater than 30 degrees, to avoid washing out any joint material." It also warns that "improper pressure or nozzle settings can harm paver surfaces, causing cracks or erosion, or potentially blowing out joint sand from crevices of pavers", and its cleaning steps end with "inspect the joints and sweep in new joint material if necessary".
• Belgard publishes no figure and a caution: "Pavers are durable... But they can be damaged by the powerful jets that pressure washers can produce." It recommends "a stiff brush and some elbow grease" as preferable and directs readers to their original installation instructions.

The three, on published figures

1. Greenworks GPW1800 — the least output, independently verified

One thousand nine hundred and eighty cleaning units is the gentlest published figure we hold, and the PWMA certification means it is a verified figure rather than a marketing peak. A 25 ft hose plus a 35 ft cord gives 60 ft of working radius, which on a patio usually means you never move the machine.

Against it: it ships a turbo nozzle, which is the single worst tip you could fit on a jointed surface — leave it in the box. Greenworks publishes no weight and no soap tank capacity, and 1.1 GPM is the lowest flow here, so rinsing a large patio takes longer.

#ad Check the Greenworks GPW1800 1800 PSI Corded Pressure Washer (PWMA Certified) price on Amazon — how we're funded.

2. Sun Joe SPX3000 — detergent capacity for the organic staining

Most patio dirt is biological — the green film on the shaded side is an organic growth, not grit — and that is a detergent problem. Two removable 0.9 liter tanks and a dedicated soap nozzle make this the machine for the part of the job that soap does.

At 2,436 cleaning units it is 23% above the GPW1800, so it asks for more discipline with the angle. No turbo nozzle in the box, which here counts in its favor.

Against it: the shortest hose of the three at 20 ft, and a two-year warranty.

#ad Check the Sun Joe SPX3000 Electric Pressure Washer price on Amazon — how we're funded.

3. Greenworks 60V — only in Eco, and only if you already own it

Six thousand cleaning units on a paver joint is the wrong tool held the wrong way. Its Eco mode — a published 2200 PSI and 1.0 GPM, so 2,200 units — brings it back into the range the corded machines occupy, and cordless genuinely helps on a patio away from the house.

Against it: you would run it detuned for the whole job, its 30 minute published runtime is short for a large patio, and Greenworks publishes no nozzle list for it, so you cannot confirm a 40 degree tip is included.

#ad Check the Greenworks 60V 3000 PSI Cordless Pressure Washer price on Amazon — how we're funded.

What the joint actually is, and why it matters

A paver patio is a structural sandwich, and the part a pressure washer threatens is not the part you can see. Under the pavers is a bedding layer, and between them is jointing sand whose job is to lock the stones against each other so the surface behaves as one plane instead of a few hundred loose tiles.

• Loose jointing sand is exactly what it sounds like and washes out most easily. It is also the cheapest to replace.
• Polymeric sand contains a binder that sets when wetted, so it resists washing far better — until it is old and cracked, at which point water gets under it and lifts it in sheets.
• Either way the failure is progressive. A joint that loses its top half inch this year holds less next year, and the stones begin to move under load.

Unilock's published warning names exactly this — improper pressure or nozzle settings "potentially blowing out joint sand from crevices of pavers" — and its cleaning routine ends by inspecting the joints and sweeping in new material.

Why the angle rule works

Most patio dirt is alive

The green or black film on the shaded side of a patio is biological growth, not embedded grit, and that changes the tool. Biological films come off with a cleaner and dwell time; they do not require force, and trying to remove them with force is how joints get destroyed.

1. Apply a cleaner suitable for your paver and let it work. Check the paver maker's literature first — Unilock and Belgard both publish lists of what not to use, and PEPA publishes a comparable list for vinyl.
2. Agitate with a stiff brush where it is worst. Belgard explicitly recommends "a stiff brush and some elbow grease" over a washer.
3. Rinse at a shallow angle with the widest tip, which is the only stage a pressure washer is genuinely needed for.
4. Let it dry, then re-sand. Sand will not settle into a wet joint.

Washing a patio without losing the joints

1. Keep the angle at 30 degrees or shallower, which is Unilock's published instruction and the only numeric guidance either maker gives.
2. Fit the widest tip that cleans. The 40 degree nozzle first; step down only if it fails, and never to turbo or 0 degree.
3. Work across the joints, not along them, so the stream crosses a groove rather than running down it.
4. Let detergent do the organic work and use the water to rinse rather than to scour.
5. Re-sand afterwards. Unilock's own routine ends by inspecting the joints and sweeping in new material. Budget for sand as part of the job.

For unjointed concrete the calculus is completely different — see pressure washers for concrete and pressure washing a driveway.

If your pavers are sealed

A sealed patio is a different surface again, and it is worth checking before you start. A sealer is a surface film, and a pressure washer will damage a film long before it damages the stone underneath it — which turns a cleaning job into a stripping-and-resealing job you did not plan.

• Check first. Water beading rather than soaking in is the usual sign of a sealer still doing its job.
• Consult the sealer maker, not the paver maker. The film is theirs and their instructions govern.
• Expect to reseal after a wash if you do proceed, and budget the time.

Neither Unilock nor Belgard publishes a pressure figure for sealed surfaces either, which is consistent with everything else on this page: the published guidance is technique and product-specific literature, never a number.

What we cannot tell you

We have not washed a paver patio. Neither Unilock nor Belgard publishes a PSI ceiling, and we deliberately do not print one. We saw a 1,600 PSI figure attributed to porcelain pavers in search results but could not retrieve the source document, so it is not cited here. Greenworks publishes no nozzle list for its 60V machine and no soap tank capacity for either of its washers, and nobody publishes how much pressure a given jointing sand withstands — polymeric and loose sand behave differently and no maker quantifies it.