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Select up to 4 generators to compare specs, power output, noise levels, runtime and more. Your compare URL is shareable.

  • DuroStar DS13000MX
  • Firman H03655
  • Model DS13000MX
    Model DS13000MX

    DuroStar 10,500W Dual-Fuel Generator

    10500W
    Running
    74 dB
    Noise
    View details
  • Model H03655
    Model H03655

    Firman 3,650W Dual-Fuel Generator

    3650W
    Running
    67 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 DS13000MXFirman H03655
General
Product type
Generator
Generator
Fuel
Dual-Fuel
Dual-Fuel
InverterNoNo
Parallel capableNoNo
RV readyYesYes
Running watts
Winner: Winner: 10500 W
3650 W
Starting watts
Winner: Winner: 13000 W
4550 W
Noise (lower limit)
74 dB
Winner: Winner: 67 dB
Weight
209 lbs
Winner: Winner: 112 lbs
Run time @50% load
8.5 h
Winner: Winner: 14 h
Run time @25% load
17 h
Not available
Fuel tank
8.3 gal
5 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
29.8 x 27.5 x 25.8
25.7 x 21.8 x 21.6
Electrical
Voltage (AC)
120/240
120V 60 Hz
Voltage (DC)
Not available
Not available
GFCI outletsYesNo
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
Not available
25 %
Engine
Engine
500 cc OHV 4-stroke, cast iron sleeve
208 cc OHV 4-stroke, cast iron sleeve
Alternator
Not available
Not available
Starting system
Recoil, Electric, Remote
Recoil
Warranty
Warranty
3 years
3 years
Power by fuel
GasolineNot availableNot available
Running watts
10500 W
3650 W
Starting watts
13000 W
4550 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
8.5 h
14 h
Run time @25% load
17 h
Not available
PropaneNot availableNot available
Running watts
9975 W
3300 W
Starting watts
12350 W
4100 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
3.3 h
Not available
Run time @25% load
6.5 h
Not available
Other
Data center
Not available
Not available
Indicators
true
false
Compliance
EPA, ANSI/PGMA G300-2023
EPA, ANSI/PGMA G300-2023
Security
Not available
Not available
Spark arrestorYesYes
Neutral
true
Floating
UPC
811640016746
840876136553
Core / High-priority specs
Running Watts (Gasoline)
10500
3650
Running Watts (Propane)
9975
3300
Starting Watts (Gasoline)
13000
4550
Starting Watts (Propane)
12350
4100
Runtime @ 50% Load (Gasoline)
8.5
14
Runtime @ 50% Load (Propane)
3.3
Not available
Runtime @ 25% Load (Gasoline)
17
Not available
Runtime @ 25% Load (Propane)
6.5
Not available
AC Outlet Types
2x Duplex 120V 20A (5-20R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R)
1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120V 30A (TT-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke, cast iron sleeve
208 cc OHV 4-stroke, cast iron sleeve
Engine Displacement
500
208
Cylinder Sleeve
Cast iron sleeve
cast iron sleeve
Alternator Winding Material
Copper windings
Not available
Engine Oil Type
10W-30
Not available
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
17
Not available
Runtime @ 50% Load (Gasoline)
8.5
14
Runtime @ 50% Load (Propane)
3.3
Not available
Safety & compliance
Overload Protection System
Low oil and overload protection, CO monitoring
Low oil and overload protection
Low Oil ProtectionNoYes
Carbon Monoxide MonitoringYesYes
Included equipment
Starting Components
Recoil, Electric, Remote
Oil, funnel, tool kit, propane hose, and wheel kit
Included Accessories
Funnel, tool kit, key fob, battery charger, propane hose, battery, and wheel kit
Oil, funnel, tool kit, propane hose, and wheel kit
Warranty & identification
Residential Warranty
Not available
3
Commercial Warranty
3
3
Additional specs
Summary
The DuroStar DS13000MX is a dual-fuel generator with a rated wattage of 10500 watts and a peak wattage of 13000 watts. It features a 500 cc OHV 4-stroke engine and is designed for versatile power needs.
The Firman H03655 is a 3,650-watt dual-fuel generator built around a 208 cc OHV 4-stroke engine with a cast iron sleeve. Running on gasoline, it delivers 4,550 starting watts and 3,650 running watts. Switch to propane and output drops to 4,100 starting watts and 3,300 running watts. This power level runs a refrigerator, microwave, window air conditioner, or multiple power tools simultaneously. The dual-fuel flexibility means you can operate on whichever fuel is available, a practical advantage during extended outages or when propane storage is more convenient than gasoline. At 67 dB at quarter load, the H03655 operates quietly enough for residential neighborhoods without disturbing neighbors. The 5-gallon tank delivers 14 hours of runtime at 50 percent load on gasoline, translating to roughly one full day of moderate use before refueling. The RV-ready configuration and included wheel kit position this unit as a go-anywhere power source for camping, job sites, and home backup scenarios.
  • Most Powerful
    DuroStar DS13000MX
    10500W running
  • Quietest
    Firman H03655
    67 dB
  • Longest Runtime
    Firman H03655
    14h at 50% load
Where to buy
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DuroStar DS13000MX
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Firman H03655
Store links
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