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  • DuroStar DS10000EH
  • Yamaha EF5500DE
  • Model DS10000EH
    Model DS10000EH

    DuroStar 8,000W Dual-Fuel Generator

    8000W
    Running
    72 dB
    Noise
    View details
  • Model EF5500DE
    Model EF5500DE

    Yamaha 4,500W Gas Generator

    4500W
    Running
    74.1 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 DS10000EHYamaha EF5500DE
General
Product type
Generator
Generator
Fuel
Dual-Fuel
Gasoline
InverterNoNo
Parallel capableNoNo
RV readyYesNo
Running watts
Winner: Winner: 8000 W
4500 W
Starting watts
Winner: Winner: 10000 W
5500 W
Noise (lower limit)
Winner: Winner: 72 dB
74.1 dB
Weight
Winner: Winner: 220 lbs
238.1 lbs
Run time @50% load
10 h
Winner: Winner: 13.5 h
Run time @25% load
22 h
Not available
Fuel tank
8.3 gal
6.9 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
29 x 30 x 26
29.1 x 29 x 31.5 in
Electrical
Voltage (AC)
120/240
120/240V 60 Hz
Voltage (DC)
12
Not available
GFCI outletsYesYes
Covered outletsNoNo
Automatic Voltage RegulationYesYes
THD
12 %
Not available
Engine
Engine
439 cc OHV 4-stroke, cast iron sleeve
Yamaha MZ360 OHV 4-stroke
Alternator
Not available
Not available
Starting system
Recoil, Electric
Recoil, Electric
Warranty
Warranty
3 years
3 years
Power by fuel
GasolineNot availableNot available
Running watts
8000 W
4500 W
Starting watts
10000 W
5500 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
10 h
13.5 h
Run time @25% load
22 h
Not available
PropaneNot availableNot available
Running watts
7600 W
Not available
Starting watts
9500 W
Not available
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
4.5 h
Not available
Run time @25% load
8.5 h
Not available
Other
Data center
Not available
Not available
Indicators
true
true
Compliance
CARB, EPA
CARB, EPA
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Not available
true
UPC
811640014421
765053823098
Core / High-priority specs
Running Watts (Gasoline)
8000
4500
Running Watts (Propane)
7600
Not available
Starting Watts (Gasoline)
10000
5500
Starting Watts (Propane)
9500
Not available
Runtime @ 50% Load (Gasoline)
10
13.5
Runtime @ 50% Load (Propane)
4.5
Not available
Runtime @ 25% Load (Gasoline)
22
Not available
Runtime @ 25% Load (Propane)
8.5
Not available
AC Outlet Types
AC outlets1x Duplex 120V 20A (5-20R)1x 120V 30A (L5-30R)1x 120/240V 30A (L14-30R)1x 120/240V 50A (14-50R)
2x Duplex 120V 20A (5-20R) 1x 120V 30A (L5-30R)1x 120/240V 30A (L14-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
439 cc OHV 4-stroke, cast iron sleeve
OHV 4-stroke
Engine Displacement
439
358
Cylinder Sleeve
Cast iron sleeve
Not available
Alternator Winding Material
Copper
Not available
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
22
Not available
Runtime @ 50% Load (Gasoline)
10
13.5
Runtime @ 50% Load (Propane)
4.5
Not available
Controls & display
Display Type
Not available
Data center
Safety & compliance
Overload Protection System
Low oil and overload protection
Low oil and overload protection
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringNoYes
Included equipment
Starting Components
Recoil, Electric
Not available
Documentation
Not available
Data center
Included Accessories
Funnel, tool kit, propane hose, battery charging cables, battery, and wheel kit
Tool kit, battery, and wheel kit
Warranty & identification
Commercial Warranty
3
Not available
Part Number
Not available
EF55DEX
Additional specs
Summary
The DuroStar DS10000EH is an 8,000-watt dual-fuel generator built on a 439 cc OHV 4-stroke engine with cast iron sleeve construction. At 8,000 running watts, this unit can power multiple household appliances simultaneously, job site tools, or serve as extended backup during outages. The dual-fuel design means users can run gasoline or propane depending on fuel availability and storage constraints, a significant advantage during supply disruptions. Because the DS10000EH runs at 72 dB, placement matters. At 25 feet, the noise becomes manageable for residential use; closer proximity requires hearing protection or evening restrictions. The 8.3-gallon tank delivers 22 hours at 25% load on gasoline, making extended operations feasible without constant refueling. On propane at the same load, runtime drops to 8.5 hours due to lower energy density. This runtime flexibility shapes real-world deployment: gasoline for long-term backup, propane for shorter bursts or when storage space is limited.
The Yamaha EF5500DE is a versatile dual 120/240 volt generator, ideal for emergency backup power for home, cottage, or business, as well as primary power on job sites. It features a 358cc OHV engine, electric start, and offers 5500 watts maximum AC output with outstanding fuel efficiency.
  • Most Powerful
    DuroStar DS10000EH
    8000W running
  • Quietest
    DuroStar DS10000EH
    72 dB
  • Longest Runtime
    Yamaha EF5500DE
    13.5h at 50% load
Where to buy
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DuroStar DS10000EH
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Yamaha EF5500DE
Store links
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