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  • DuroStar DS4000S
  • Genmax GM3500iAED
  • Model DS4000S
    Model DS4000S

    DuroStar 3,300W Gas Generator

    3300W
    Running
    69 dB
    Noise
    View details
  • Model GM3500iAED
    Model GM3500iAED

    Genmax 3,200W Dual-Fuel Generator

    3200W
    Running
    62 dB
    Noise
    View details
Quick charts
Each chart uses its own Y-axis scale (so numbers are comparable within a chart).
Running watts
W
Starting watts
W
Noise
dB
Runtime @50%
h
Running watts by fuel
Shows how output changes across gasoline/propane/natural gas (when available).
Generator Specifications Comparison
SpecificationDuroStar DS4000SGenmax GM3500iAED
General
Product type
Generator
Generator
Fuel
Gasoline
Dual-Fuel
InverterNoYes
Parallel capableNoYes
RV readyNoNo
Running watts
Winner: Winner: 3300 W
3200 W
Starting watts
Winner: Winner: 4000 W
3500 W
Noise (lower limit)
69 dB
Winner: Winner: 62 dB
Weight
92 lbs
Winner: Winner: 56.2 lbs
Run time @50% load
Winner: Winner: 12 h
Not available
Run time @25% load
26 h
9 h
Fuel tank
4 gal
1.7 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
23 x 18 x 17.5
20.9 x 12.2 x 19.7
Electrical
Voltage (AC)
120
120
Voltage (DC)
Not available
5
GFCI outletsNoNo
Covered outletsNoYes
Automatic Voltage RegulationYesYes
THD
Not available
≤3% %
Engine
Engine
DuroStar OHV 4-stroke
145 cc OHV 4-stroke
Alternator
Not available
Not available
Starting system
Recoil
Recoil, Electric, Remote
Warranty
Warranty
3 years
1 years
Power by fuel
GasolineNot availableNot available
Running watts
3300 W
3200 W
Starting watts
4000 W
3500 W
Running amps (120V)
Not available
Not available
Running amps (240V)
Not available
Not available
Peak amps (120V)
Not available
Not available
Peak amps (240V)
Not available
Not available
Run time @50% load
12 h
Not available
Run time @25% load
26 h
8 h
PropaneNot availableNot available
Running watts
Not available
2800 W
Starting watts
Not available
3100 W
Running amps (120V)
Not available
Not available
Running amps (240V)
Not available
Not available
Peak amps (120V)
Not available
Not available
Peak amps (240V)
Not available
Not available
Run time @50% load
Not available
Not available
Run time @25% load
Not available
16 h
Other
Data center
Not available
Not available
Indicators
true
true
Compliance
CARB, EPA
EPA, ANSI/PGMA G300-2023
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Floating
true
UPC
811640011840
713424639021
Core / High-priority specs
Running Watts (Gasoline)
3300
3200
Running Watts (Propane)
Not available
2800
Starting Watts (Gasoline)
4000
3500
Starting Watts (Propane)
Not available
3100
Runtime @ 50% Load (Gasoline)
12
Not available
Runtime @ 25% Load (Gasoline)
26
8
Runtime @ 25% Load (Propane)
Not available
16
AC Outlet Types
1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R)
1x Duplex 120V 20A (5-20R) 1x 120V 30A (L5-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke
OHV 4-stroke
Engine Displacement
208
145
Engine Oil Type
10W-30
10W-30
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
26
8
Runtime @ 50% Load (Gasoline)
12
Not available
Safety & compliance
Overload Protection System
Low oil and overload protection
Not available
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringNoYes
Included equipment
Included Accessories
Funnel and tool kit
Funnel, tool kit, key fob, propane hose, RV adapter, and battery
Additional specs
Summary
The DuroStar DS4000S is a 3,300-watt gasoline generator built around a DuroStar OHV 4-stroke engine that delivers 4,000 peak watts for startup surges. This wattage range powers essential household appliances, power tools, and small job site equipment simultaneously. A single person can operate it because the recoil starting system requires only manual pull-cord engagement, though the 92-pound weight means transport over distance demands planning. The 4-gallon fuel tank runs 26 hours at 25 percent load or 12 hours at 50 percent load, making it suitable for extended outages or multi-day outdoor use without constant refueling. EPA and CARB compliance clears this unit for all 50 states.
The Genmax GM3500iAED is a 3,200-watt dual-fuel inverter generator that runs on gasoline or propane. At 56.2 lbs, it handles essential household loads like refrigerators and small power tools while remaining portable enough for camping or job sites. The 62 dB noise level keeps it residential-friendly.
  • Most Powerful
    DuroStar DS4000S
    3300W running
  • Quietest
    Genmax GM3500iAED
    62 dB
  • Longest Runtime
    DuroStar DS4000S
    12h at 50% load
Where to buy
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DuroStar DS4000S
Store links
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Genmax GM3500iAED
Store links
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