• 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner
  • 21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner

Optional Extras

  • 240 Litre Mobile Water Wheelie Bin Buffer Tank with Overflow Cut-off Float Valve

    240 Litre Mobile Water Wheelie Bin Buffer Tank with Overflow Cut-off Float Valve

    £199.95 Inc VAT

    [£166.63 Ex VAT]

  • Kiam SurfacePro 18 Rotary Floor Cleaning Tool Steel Flat Surface Cleaner 18"

    Kiam SurfacePro 18 Rotary Floor Cleaning Tool Steel Flat Surface Cleaner 18"

    Was £599.00

    £399.00 Inc VAT

    [£332.50 Ex VAT]

  • Kiam SurfacePro 21 Rotary Floor Cleaning Tool Steel Flat Surface Cleaner 21"

    Kiam SurfacePro 21 Rotary Floor Cleaning Tool Steel Flat Surface Cleaner 21"

    Was £799.00

    £469.00 Inc VAT

    [£390.83 Ex VAT]

  • Kiam SurfacePro 21 Dual Trigger Steel Rotary Floor Cleaning Tool & Wash Broom 21"

    Kiam SurfacePro 21 Dual Trigger Steel Rotary Floor Cleaning Tool & Wash Broom 21"

    Was £849.00

    £675.00 Inc VAT

    [£562.50 Ex VAT]

  • Heavy Duty 5/16" Pressure Washer Hose - 3/8" Male & Female Quick Release, 250 Bar/3750 PSI Rated

    Heavy Duty 5/16" Pressure Washer Hose - 3/8" Male & Female Quick Release, 250 Bar/3750 PSI Rated

    £65.95 Inc VAT

    [£54.96 Ex VAT]

    Add

RATED EXCELLENT ON TRUSTPILOT

EXPRESS DELIVERY AVAILABLE

21LPM Petrol Pressure Washer – Kiam KM3700PHI HIFLOW | 14HP Jet Cleaner

Was £1,899.95

£1,195.00 Inc VAT

[£995.83 Ex VAT]

Quantity

IN STOCK

KEY FEATURES

  • 21 Litres Per Minute Flow Rate: Unmatched high-flow cleaning for extensive tasks.
  • 3000 PSI Operating Pressure: Ensures efficient and powerful performance.
  • 14HP 4-Stroke Petrol Engine: High-performance LONCIN engine for robust power.
  • HI-FLOW Pump: Ensures high-volume water dispensing with consistent pressure.
  • Gearbox-Driven Brass Pump: Equipped with German Parker seals for durability and reduced wear.
  • Thermal Relief Valve (TRV): Prevents overheating and ensures safe operation.
  • 5 Quick-Release Nozzles: Includes 0, 15, 25, 45, and 80-degree nozzles for versatile cleaning.
  • Variable Pressure Control Valve: Allows precise pressure adjustments.
  • Variable Throttle Control: Provides easy engine speed adjustments.
  • Low Oil Shut Down Protection: Safeguards the engine from low oil levels.
  • Heavy Duty Steel Chassis: Powder coated for durability with rubber anti-vibration shock absorbers.
  • Low Pressure Detergent Application: Features a detergent pipe filter for easy application.
  • 10M High Pressure Hose: Industrial quality hose for extended reach.
  • Professional Grade Trigger Gun: High pressure gun with a stainless steel lance.
  • Recoil Starter: Robust and reliable starting mechanism.
  • Pneumatic Tyres: For easy maneuverability on various terrains.
  • 12 Months Return to Base Warranty: Ensures peace of mind with your purchase.

FULL DESCRIPTION

KIAM® Logo
🌊 HIGH-FLOW ELITE • 🛢️ TANK-FEED READY

KM3700PHI — 21 LPM / 3000–3700 PSI Petrol Pressure Washer

14 HP 4-stroke + HI-FLOW pump for rapid rinsing, deep cleaning and reliable tank/butt feed.

MAX PRESSURE
3700 PSI / 255 bar
FLOW RATE
21 LPM (HI-FLOW)
ENGINE POWER
14 HP 4-Stroke

🛢️ Static Source Ready

Draw from tanks/butts/mains with 3 m suction hose & inline filter.

🛡️ Engine Protection

Low-oil shutdown safeguards for long-term reliability.

⚡ Quick-Swap Control

5 quick-release nozzles for instant mode changes.

🌊 Why 21 LPM Changes Everything

  • 🚿Faster rinse-off — flush mud, moss & slurry faster than standard flows.
  • 🧼Wider coverage — chew through large patios, driveways & yards.
  • 🧪Better chem draw with downstream injection setups.
  • 🧱Tough steel chassis with anti-vibration mounts.

Working pressure: 3000 PSI / 200 bar (Max 3700 PSI / 255 bar).

Feeding from a tank? Our guide: Tank/Butt Feeding

🎯 Best-Fit Usage


Light washDomestic patiosDrivewaysHeavy rinse

🏡 Driveways & Yards

Cut project times with high-volume rinsing.

🚜 Plant & Machinery

Shift baked-on debris fast after a chem dwell.

🌀 Pre-Rinse Pro

Perfect pre-rinse for rotary surface cleaners.

💡 Key Features

  • 💧HI-FLOW pump tuned for volume & longevity.
  • 🛡️Anti-vibration shock absorbers on heavy steel frame.
  • 🧰Includes 10 m HP hose, pro trigger gun & steel lance.
  • 🎯5 quick-release nozzles: 0°, 15°, 25°, 40°, soap.
  • ⚠️Low-oil shutdown protects your engine automatically.
  • 🛢️Tank-feed ready: 3 m suction hose + inline filter included.

📦 In the Box

  • KM3700PHI petrol pressure washer unit
  • 10 m high-pressure hose
  • Professional trigger gun & steel lance
  • 5 × steel quick-release spray nozzles
  • 3 m water suction hose with inline filter
  • Tool kit & user manual

🧪 Pressure gauge sold separately.

📊 Technical Specifications

Feature Details
Model KIAM KM3700PHI
Max Pressure 3700 PSI / 255 bar
Working Pressure 3000 PSI / 200 bar
Rated Flow 21 L/min
Engine 14 HP KIAM OHV 4-stroke (air-cooled)
Engine Speed 3400 rpm
Fuel Type ⛽ Unleaded petrol
Displacement 420 cc
Max Torque 26.5 N·m
Dimensions (L×W×H) 79 × 50 × 60 cm
Weight 70 kg

📘 More info & manuals: Instruction Manuals

🧰 Start a Driveway Business

Read the guide

📚 Cleaning Tutorials

Explore articles

🎓 Petrol vs Diesel

Compare options

🌊⚡ High-flow. High-pressure. High-productivity. — Upgrade to the KM3700PHI today.

CUSTOMER REVIEWS

WHATS IN THE BOX?

Included in the Box

  • 1x KM3700PHI Petrol Pressure Washer Unit
  • 1x 10m High Pressure Hose
  • 1x Detergent Pipe & Filter
  • 1x High-Pressure Trigger Gun
  • 1x Steel Lance with Nozzle Connector
  • 5x Steel Quick-Release Spray Nozzles
  • 1x 3m Water Suction Hose with Water Filter
  • 1x Tool Kit
  • 1x User Manual

Optional Extras

  • 240 Litre Mobile Water Wheelie Bin Buffer Tank with Overflow Cut-off Float Valve

    240 Litre Mobile Water Wheelie Bin Buffer Tank with Overflow Cut-off Float Valve

    £199.95 Inc VAT

    [£166.63 Ex VAT]

  • Kiam SurfacePro 18 Rotary Floor Cleaning Tool Steel Flat Surface Cleaner 18"

    Kiam SurfacePro 18 Rotary Floor Cleaning Tool Steel Flat Surface Cleaner 18"

    Was £599.00

    £399.00 Inc VAT

    [£332.50 Ex VAT]

  • Kiam SurfacePro 21 Rotary Floor Cleaning Tool Steel Flat Surface Cleaner 21"

    Kiam SurfacePro 21 Rotary Floor Cleaning Tool Steel Flat Surface Cleaner 21"

    Was £799.00

    £469.00 Inc VAT

    [£390.83 Ex VAT]

  • Kiam SurfacePro 21 Dual Trigger Steel Rotary Floor Cleaning Tool & Wash Broom 21"

    Kiam SurfacePro 21 Dual Trigger Steel Rotary Floor Cleaning Tool & Wash Broom 21"

    Was £849.00

    £675.00 Inc VAT

    [£562.50 Ex VAT]

  • Heavy Duty 5/16" Pressure Washer Hose - 3/8" Male & Female Quick Release, 250 Bar/3750 PSI Rated

    Heavy Duty 5/16" Pressure Washer Hose - 3/8" Male & Female Quick Release, 250 Bar/3750 PSI Rated

    £65.95 Inc VAT

    [£54.96 Ex VAT]

    Add