Quick Answer
For most Australian homes, a 1,500–2,000 PSI electric pressure washer ($150–$400) handles driveways, decks, fences, and patio furniture without damaging surfaces. Petrol pressure washers (2,000–3,500 PSI) suit larger properties and tougher jobs like stripping paint or cleaning large concrete areas. Avoid anything over 2,500 PSI for timber surfaces — you’ll strip the grain.
Pressure Washer Types: Electric vs Petrol
Electric Pressure Washers
Electric pressure washers are quieter, lighter, and require no fuel mixing. They’re ideal for regular household use: driveways, paths, decks, cars, patio furniture, and fences. Most home models produce 1,200–2,200 PSI, which is sufficient for almost every residential cleaning task.
Petrol Pressure Washers
Petrol models are louder, heavier, and require regular maintenance (oil checks, spark plug replacement, seasonal carburettor care) but deliver significantly more power. For large properties, farm use, or stripping old paint and moss from concrete, a 2,000–3,500 PSI petrol unit gets the job done faster.
| Type | PSI Range | Price Range | Best For |
|---|---|---|---|
| Electric — light duty | 1,200–1,600 PSI | $80–$180 | Cars, garden furniture, light deck cleaning |
| Electric — medium duty | 1,600–2,200 PSI | $180–$400 | Driveways, fences, decks, paths — most homes |
| Petrol — medium | 2,000–2,800 PSI | $400–$800 | Large driveways, farm use, semi-regular heavy cleaning |
| Petrol — heavy duty | 2,800–3,500 PSI | $800–$2,000 | Stripping paint, large concrete surfaces, commercial |
Key Specs to Compare
PSI (Pounds Per Square Inch)
PSI measures water pressure. Higher PSI removes stubborn stains faster but risks damaging surfaces. For timber decks, stay below 1,500 PSI and keep the nozzle moving. For raw concrete, 2,000–2,500 PSI is effective. Sealed concrete and painted surfaces: 1,200–1,800 PSI maximum.
L/min (Litres Per Minute)
Flow rate determines how quickly you can rinse an area. A pressure washer with 1,800 PSI and 6 L/min will clean faster than a 1,800 PSI unit with 4 L/min. Water council restrictions in SE Melbourne suburbs (Dandenong, Berwick, Narre Warren) apply during water restriction periods — check South East Water for current rules.
Nozzle Types
Most pressure washers include multiple colour-coded nozzles. The 0° red nozzle delivers a pinpoint jet for stubborn stains — use it only on raw concrete. The 25° green nozzle is the everyday choice for driveways and fences. The 40° white nozzle is gentlest and suitable for cars and timber. A detergent nozzle (black) delivers low pressure for applying cleaning solution before rinsing.
Recommended Models for Australian Homes
| Model | PSI | Type | Price (AUD) | Best For |
|---|---|---|---|---|
| Karcher K2 Compact | 1,600 PSI | Electric | ~$150 | Cars, furniture, light driveways |
| Karcher K4 Premium | 1,900 PSI | Electric | ~$350 | Driveways, decks, fences — most homes |
| Gerni Super 130 | 1,885 PSI | Electric | ~$300 | Good Australian brand, solid warranty |
| Ryobi RPW2000 | 2,000 PSI | Electric | ~$280 | Heavy home use, large driveways |
| Honda WB40XH | 3,200 PSI | Petrol | ~$1,100 | Large properties, professional-grade cleaning |
What to Avoid
- No-name imports under $80. They typically have poor pump seals, no parts availability, and limited warranty. You’ll spend more replacing them than buying once.
- Overpowered units for timber. Using a 2,500+ PSI unit on treated pine decking raises the grain and leaves furry fibres that absorb stain unevenly.
- Unregulated eBay nozzles. Off-brand nozzles can crack under pressure, turning into projectiles. Use manufacturer-supplied or OEM-compatible nozzles.
Tips and Gotchas
- Test on a hidden area first. Before blasting a whole driveway or deck, test your chosen nozzle and distance on an inconspicuous corner. Some surfaces damage more easily than they look.
- Keep the nozzle moving. Holding still — especially with a narrow-angle nozzle — etches concrete and raises grain on timber. Work in consistent overlapping passes.
- Stand 30cm from concrete. For a 25° nozzle, 25–40cm from the surface delivers maximum cleaning with minimum etching risk.
- Flush inlet filter before use. Remove and rinse the inlet filter before every session — a blocked filter causes pump cavitation and shortens motor life significantly.
- Electric won’t strip old paint. If you need to strip exterior paint from weatherboards before repainting, hire a petrol unit with a turbo nozzle rather than fighting with an electric.
- Check water restriction rules. In Melbourne and surrounds, restrictions on hosing (and by extension pressure washing) apply periodically. Check with South East Water or Yarra Valley Water before planning a big clean during dry months.
- Never point at skin. Even at 1,200 PSI, a pressure washer jet can lacerate skin. Keep the nozzle away from your body and feet, and wear enclosed footwear.
- Store with pump protector. At end of season, run pump protector fluid (available from most hardware stores) through the pump before storage. It prevents corrosion and seal drying that kills pumps over winter.
Where to Buy in Melbourne
- Bunnings Warehouse — Karcher and Ryobi; stores in Dandenong, Cranbourne, Frankston, Narre Warren
- Total Tools — Gerni, Honda, and higher-end petrol models
- Toolkit Depot — good range of Karcher accessories and replacement nozzles
- Mitre 10 — smaller stores; good for accessories and pump protector fluid
Frequently Asked Questions
What PSI pressure washer do I need for a concrete driveway in Melbourne?
For a standard residential concrete driveway — whether plain, exposed aggregate or stencilled — 1,800–2,200 PSI is the sweet spot. It removes surface dirt, algae and grime without etching the concrete surface or risking damage to exposed aggregate stones. A 25° nozzle at 25–35cm from the surface works well.
Can I use a pressure washer on my timber deck?
Yes, but carefully. Use the 40° white nozzle, stay above 30cm from the surface, and keep the wand moving in the direction of the grain. Merbau and treated pine both respond well to 1,000–1,500 PSI maximum. Going higher or stopping mid-pass raises the grain and leaves marks that are very difficult to sand out before oiling.
Is Karcher or Ryobi better for home use in Australia?
Both are reliable brands with good Australian warranty support. Karcher has a longer track record and broader service network; Ryobi is often slightly cheaper and shares batteries with their power tool range (useful if you already own Ryobi tools). For a first pressure washer, either the Karcher K4 or Ryobi RPW2000 are solid choices.
Do I need to hire a pressure washer or is buying worth it?
If you have a driveway, deck, fence and patio, you’ll use a pressure washer several times a year. At $180–$350 for a reliable electric model, it pays for itself after 2–3 hire sessions (hire rates typically run $80–$120 per half-day). For one-off jobs — like stripping paint before a repaint — hiring a heavy-duty petrol unit makes more sense than buying.
Will a pressure washer work on my Colourbond fence?
Yes — Colorbond steel cleans up well with a pressure washer. Use the 25° or 40° nozzle, stay at least 30cm from the panel, and avoid pressure washing the same spot twice in quick succession. Check for any peeling or surface corrosion first — pressure washing loose paint accelerates flaking and is best done right before a touch-up paint job rather than as routine cleaning.