Pick the Right Pressure Washer Based on Real Physics
Most pressure washer specs are exaggerated on the box. We break down the actual hydraulic math; the working PSI, true water flow, and fitting sizes, so you never waste money on an underpowered rig.
Quick Estimator
Instant PSI, GPM & Time Guidance
Browse By Pressure Washer Model
Select your manufacturer to inspect verified pump outlet thread dimensions (M22-14mm vs 15mm vs 3/8" QC), replacement hose specs, and teardown diagnostics.
Interactive Tools Built on Real Fluid Math
Run your numbers before spending a dime. Calculate job times, surface cleaner sizing, and chemical dilution ratios.
Chemical Dilution Calculator
Dial in batch mixes and downstream injector ratios for pool shock (SH), simple green, and degreasers. No burned siding or dead flowerbeds.
Open Dilution ToolSurface Cleaner Sizer & Tiger Stripe Predictor
Pair your pump's flow with the right deck size. Avoid the #1 DIY headache: buying an oversized 16-inch cleaner that stalls your pump and leaves zebra stripes on concrete.
Open Sizer ToolHose Friction Loss & Pressure Drop Calculator
See how much pressure you lose pushing water through 50, 100, or 200 feet of hose. Find out why downstream injectors stop pulling soap when you add extra line.
Open Pressure Drop ToolPressure Washing Project & Price Estimator
Planning a driveway or siding job? Plug in your square footage and machine specs to estimate how long the wash will take, how much water you'll burn through, and fair contractor rates.
Latest Guides & Equipment Comparisons
Forensic teardowns, nozzle selection rules, and small-engine diagnostics.
Electric Pressure Washer Motor Hums But Won't Run — 4 Mechanical Fixes
Electric pressure washer motor hums but won
Electric Pressure Washer Pulses When Trigger Released? 4 TSS Fixes
Electric pressure washer pulses when trigger is released? Learn how TSS pressure decay causes ghost cycling, diagnose weeping leaks, and fix it step-by-step.
Pressure Washer Stalls When Trigger Released? Unloader Valve Bypass Fix
Pressure washer dies when you let go of the trigger? A mechanical engineer breaks down stuck unloader valves, hydraulic deadhead stall, and step-by-step bench fixes.
Pressure Washer Pull Cord Hard to Pull — How to Fix Hydraulic Lock and Valve Lash
Pressure washer pull cord hard to pull or snapping back? A mechanical engineer explains why water pressure locks the rope, how to adjust valve lash, and quick fixes.
Pressure Washer Trips GFCI Immediately? Electrical Inrush & Ground Fault Fixes
Pressure washer trips the GFCI immediately? A mechanical engineer breaks down water leaks, bad motor capacitors, extension cord voltage drop, and step-by-step fixes.
Pressure Washing Chemistry & Surface Restoration Manual: SH Ratios, Surfactants & Rotary Sizing
Mechanical engineer
Standard Pressure Washer Nozzle Color Guide
Pulling the trigger with the wrong tip can etch concrete, gouge soft cedar, or peel vehicle clearcoat in a split second. Here is what every spray angle is actually built for.
| Color / Angle | Spray Pattern | Best Used For | Caution & Limits |
|---|---|---|---|
| Red (0°) | High-pressure pinpoint pencil jet | Stubborn concrete stains, baked-on mud clods, high-reach exterior spots | Will gouge wood, strip paint, and cut skin. Never use on vehicles or siding. |
| Yellow (15°) | Narrow chisel spray fan | Heavy stripping, rust removal, surface paint prep, oil grime on driveways | Keep back 12+ inches on masonry. High risk of cutting into soft wood or composite decks. |
| Green (25°) | General flushing medium fan | Driveways, brick walkways, patios, sidewalks, sweeping loose debris | Standard all-around cleaning tip. Keep a steady sweep distance to avoid visible stripe marks. |
| White (40°) | Wide gentle fan | Vinyl siding, stucco, windows, cars, outdoor furniture, painted wood | Safe for fragile surfaces. Lower impact pressure; ideal for washing down detergents. |
| Black (65°) | Low-pressure wide brass tip | Applying soap, detergents, and chemical soft-wash solutions | Cannot strip dirt; soap injector only. Low PSI drop triggers chemical siphoning. |
Our Testing & Editorial Standards
Every guide and calculator on Pressurewashify is authored and reviewed by Najam, a mechanical engineer with expertise in fluid power mechanics and hydraulic pumping systems. Where generic sites simply repeat manufacturer PSI ratings, we apply fluid friction formulas to calculate the pressure that actually reaches the nozzle. When you buy through our links, we may earn an affiliate commission at no extra cost to you — but we never accept sponsored placements or paid product reviews. If an equipment spec doesn't hold up to engineering scrutiny, we don't recommend it.