Simpson Pro Series 3700 PSI Pressure Washer Review: Pro-Level Gas Power for Driveways, Concrete, and Heavy Cleaning

The Simpson Pro Series 3700 PSI pressure washer is made for people who want a washer that feels close to commercial-grade, not just basic home cleaning. This model is for tough surfaces and heavy outdoor work, where normal 3000 PSI washers start feeling slow.
If you clean:

  • Large driveways

  • Big patios

  • Sidewalks and parking areas

  • Outdoor walls and fences

  • Heavy dirt, algae, and grime

This is not a light weekend washer. It is a machine designed for strong performance, faster cleaning, and long use.

What is the Simpson Pro Series 3700 PSI Pressure Washer?

The Simpson Pro Series 3700 PSI is a cold water gas pressure washer built for heavy-duty residential and pro-level use.
It typically offers:

  • 3700 PSI pressure (high impact power)

  • Strong water flow (varies by version)

  • Rugged build quality

  • Performance aimed at frequent and demanding cleaning

This power level is great for deep cleaning, but it must be used carefully.

Who Should Buy the Pro Series 3700 PSI?

This model is best for you if:

  • You want faster deep cleaning on concrete

  • You clean large outdoor areas regularly

  • You deal with algae buildup, mud stains, and heavy grime

  • You want near-contractor performance at home

  • You want a pressure washer for long working sessions

This model may not be for you if:

  • You only wash cars once in a while

  • You want quiet and lightweight

  • You have small spaces only (balcony, small patio)

  • You want electric plug-and-play convenience

Cleaning Power Explained (What 3700 PSI Feels Like)

PSI equals heavy cutting strength. 3700 PSI is strong enough to:

  • Cut through tough grime on concrete

  • Remove algae and buildup quickly

  • Blast off stuck mud and dirt

  • Clean patios and sidewalks faster

  • Strip loose paint if used aggressively

Compared to 3000 to 3200 PSI models:

  • Fewer passes are needed

  • Stains break more quickly

  • Performance on rough surfaces improves

  • It is more effective on stubborn dirt buildup

This is a big jump in real cleaning strength.

Best Use Cases (Where This Pro Washer Dominates)

1) Driveway and Concrete Deep Cleaning (Top Use)

This washer is made for concrete. It removes:

  • Heavy surface grime

  • Thick dust layers

  • Mud stains

  • Algae film

  • Driveway dark patches

Best technique for driveways:

  • Start with 25 degree green tip

  • Use 15 degree yellow for stubborn spots

  • Move in slow straight lines

  • Overlap passes slightly

  • Keep the distance consistent

Best upgrade tip: Use a surface cleaner attachment for faster and smoother results.

2) Sidewalks, Walkways, Parking Areas

Works extremely well for larger flat areas:

  • Wide sidewalks

  • Parking tiles

  • Long footpaths

  • Outdoor corridors

Cleans faster than mid-range washers because it breaks dirt quickly and rinses better.

3) Patios, Pavers, Outdoor Floors

Perfect for:

  • Patio stones

  • Pavers

  • Outdoor steps

  • Terrace floors

  • Garage floors

Caution for pavers: high PSI can remove joint sand if you get too close. Use 25 degree nozzle, keep a safe distance, and test a small area first.

4) Walls, Gates, Fences, and Exterior Surfaces

Good for:

  • Brick and stone walls

  • Metal gates

  • Boundary walls

  • Fence cleaning

Painted surface caution: because 3700 PSI is powerful, use 40 degree nozzle, increase distance, and keep spray moving to prevent paint damage.

5) Heavy Mud, Tools, Equipment Cleaning

Handles muddy outdoor equipment easily. Great for:

  • Garden tools

  • Muddy tires (careful)

  • Farm equipment

  • Storage area floors

This is where a Pro series washer really feels worth it.

Can You Wash a Car With 3700 PSI?

Yes, but only safely, and this machine is stronger than what most people need for car washing.

Safe car wash method:

  • Use 40 degree nozzle

  • Keep a distance of 3 feet if possible

  • Avoid 0 degrees and 15 degrees onthe  paint

  • Avoid direct spray into seals, sensors, trim edges, and engine bay areas

Best car wash routine:

  1. Gentle rinse

  2. Apply soap with a soap nozzle

  3. Wash by hand

  4. Gentle rinse again

  5. Dry with microfiber

It can be safe, but it is overkill if the car wash is your main purpose.

Spray Tips Guide (Power Control is Everything)

Most Simpson units support standard tips:

  • 0-degree red tip — only for very tough concrete spots; extremely aggressive, use only if experienced.

  • 15-degree yellow tip — driveway deep cleaning and hard stains.

  • 25-degree green tip — best general-use tip for patios, sidewalks, and outdoor floors.

  • 40-degree white tip — car wash and gentle cleaning; use from a distance on painted walls.

  • Soap tip (black) — for detergent application.

Setup Guide (Step-by-Step Proper Use)

Step 1: Connect water supply — use a good hose with steady, strong water flow.
Step 2: Connect high-pressure hose and spray gun — tighten properly.
Step 3: Purge air — press the trigger for 20 to 30 seconds before engine start.
Step 4: Start engine — fuel ON, choke ON for cold start, pull start, reduce choke after warm.
Step 5: Start cleaning safely — begin with 25 degree nozzle and test on a small corner first.

Pros and Cons

Pros

  • High 3700 PSI cleaning power

  • Faster results than 3000 to 3400 PSI models

  • Excellent for concrete and outdoor grime

  • Great for large areas and long sessions

  • Strong professional-style performance

  • Works well with surface cleaners

Cons

  • Heavier and louder than electric washers

  • Requires fuel and maintenance

  • Can strip paint or damage surfaces if used incorrectly

  • Overkill for small jobs and casual users

  • Deep oil stains still need degreaser and extra effort

Maintenance Tips (Very Important for Long Life)

After each use:

  • Turn off the engine

  • Shut off the water supply

  • Release pressure from the spray gun

  • Store hose neatly

  • Cool down before storing

Engine care:

  • Check oil regularly

  • Change oil as recommended

  • Use fresh fuel

  • Clean the air filter when dusty

Pump care:

  • Never run without water

  • Avoid leaving it idle while ON

Common Problems & Fixes

Low pressure
Causes: clogged nozzle, air in the system, low water supply.
Fix: clean nozzle, purge air again, ensure good water flow.

Pulsing spray
Cause: air bubbles.
Fix: purge air and spray steadily for a minute.

The engine won’t start
Cause: old fuel, incorrect choke.
Fix: use fresh fuel, adjust the choke properly, and check the oil level.

Simpson Pro Series 3700 PSI vs MegaShot 3400 PSI vs PowerShot 4000 PSI

MegaShot 3400 PSI

  • Best value heavy home cleaning

  • Strong results for most homeowners

Pro Series 3700 PSI

  • Stronger and faster than 3400

  • Closer to contractor use

  • Perfect for big concrete and heavy grime

PowerShot 4000 PSI (high flow)

  • Maximum heavy-duty performance

  • Fastest for large cleaning jobs

  • Best for contractors or very large homes

If you want very strong performance without going to 4000 PSI, 3700 PSI is the perfect upgrade.

Final Verdict

The Simpson Pro Series 3700 PSI pressure washer is a powerful, heavy-duty gas washer made for serious outdoor cleaning. It is excellent for driveways, sidewalks, patios, walls, and heavy grime removal. This model is best for homeowners with large cleaning areas or anyone who wants near-pro results with faster cleaning speed. If your home needs strong cleaning regularly and you want a washer that performs like a pro tool, this is a top-tier pick.