Whisper Series Open Frame 4400 Watts Generator Model WH03562OF
A yellow FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT features a 6-gallon tank, multiple outlets, safety alert, and wheels—your reliable portable power source.
The FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT comes with a battery, oil funnel, engine oil, padded handle, toolkit, wheels, charging cable, regulator hose, and parallel cable.
The FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT offers portable, fuel-efficient power plus a hose holder and L5-30P to TT-30R adapter for added convenience.
Labeled diagram of the FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT control panel, with numbered switches, outlets, and ports—each identified by function and fuel-efficient specs.
The FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start features a CO ALERT indicator light that warns of engine shutdown from carbon monoxide or system faults, ensuring vital safety for fuel-efficient generators.
Image of the FIRMAN Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT, featuring icons for portable A/C, tools, RV camping, appliances, smartphone, and laptop. Bold heading: “What Will Your Generator Power?”—fuel-efficient power anywhere.
Partial view of FIRMAN Power Equipment’s Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT next to a “3 Year Warranty” badge; text highlights FIRMAN’s 3-year warranty on new, fuel-efficient generators.
A customer review praises the FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT for fuel efficiency and reliable performance during a 6-day Hurricane Beryl outage, easily powering multiple appliances.
The FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT features a yellow and black design, large wheels, measures 23"H x 24.1"L x 24.5"W, weighs 119 lbs—perfect for reliable, fuel-efficient power anywhere.
A black and yellow infographic details four steps to determine the right size Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT by FIRMAN Power Equipment, with text and a control panel image in the background.
The FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT is shown in front of a modern house with lightning in the background.
A man fills a FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT outside a house on a sunny day, ensuring reliable backup power when needed.
A FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT is on a driveway, situated between a propane tank on the left and a red gasoline container on the right, with trees and grass in the background.
Whisper Series Open Frame 4400 Watts Generator Model WH03562OF
A yellow FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT features a 6-gallon tank, multiple outlets, safety alert, and wheels—your reliable portable power source.
The FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT comes with a battery, oil funnel, engine oil, padded handle, toolkit, wheels, charging cable, regulator hose, and parallel cable.
The FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT offers portable, fuel-efficient power plus a hose holder and L5-30P to TT-30R adapter for added convenience.
Labeled diagram of the FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT control panel, with numbered switches, outlets, and ports—each identified by function and fuel-efficient specs.
The FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start features a CO ALERT indicator light that warns of engine shutdown from carbon monoxide or system faults, ensuring vital safety for fuel-efficient generators.
Image of the FIRMAN Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT, featuring icons for portable A/C, tools, RV camping, appliances, smartphone, and laptop. Bold heading: “What Will Your Generator Power?”—fuel-efficient power anywhere.
Partial view of FIRMAN Power Equipment’s Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT next to a “3 Year Warranty” badge; text highlights FIRMAN’s 3-year warranty on new, fuel-efficient generators.
A customer review praises the FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT for fuel efficiency and reliable performance during a 6-day Hurricane Beryl outage, easily powering multiple appliances.
The FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT features a yellow and black design, large wheels, measures 23"H x 24.1"L x 24.5"W, weighs 119 lbs—perfect for reliable, fuel-efficient power anywhere.
A black and yellow infographic details four steps to determine the right size Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT by FIRMAN Power Equipment, with text and a control panel image in the background.
The FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT is shown in front of a modern house with lightning in the background.
A man fills a FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT outside a house on a sunny day, ensuring reliable backup power when needed.
A FIRMAN Power Equipment Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT is on a driveway, situated between a propane tank on the left and a red gasoline container on the right, with trees and grass in the background.
01/14
Certification: Certification CARB Certification cETL Certification EPA
Model: wh03562of

Dual Fuel Open Frame Inverter 4400W Electric Start with CO ALERT
$1,199.99 USD $1,299.99 USD
Free Shipping on all Generators
SERIES Hybrid
TYPE Inverter

The FIRMAN WH03562OF delivers fuel-efficient, clean, and renewable power, making it ideal for electronics, sensitive equipment, and extended run times. Whether you're camping, performing, or hosting an outdoor event, this generator provides reliable power when you need it most.

With a 6-gallon fuel tank, the WH03562OF runs for up to 22 hours at 25% load, ensuring long-lasting performance. It delivers 4,400 starting watts and 3,500 running watts on gasoline, while propane operation provides 4,000 starting watts and 3,200 running watts. Operating at 120V, this dual-fuel generator gives you flexibility and efficiency in any situation.

The WH03562OF comes with an engine oil bottle, oil funnel, spark plug wrench, a double open-ended wrench (10mm,12mm), 12V battery cable, LPG regulator with hose holder, L5-30P to TT-30R adaptor, parallel cable, and parallel cable holder.

LEGENDARY FIRMAN ENGINEERING

  • 208cc max pro series engine
  • Recoil start 
  • Electric start 
  • Low oil shut off
  • Cast iron sleeve
  • Running watts 3500W (GAS), 3200W (LPG)
  • Starting watts 4400W (GAS), 4000W (LPG)
  • 120 volts

PERFORMANCE IN A LEAGUE OF ITS OWN

  • 6-gallon tank
  • Up to 22 hours of run time at 25% load
  • Weight: 119 lbs
  • 67dB ¼ load

FEATURES YOU EXPECT FROM FIRMAN

3-year warranty

New CO alert technology

Multi-featured control panel with covered outlets

  • (1) 5-20R 120V 20A DUPLEX
  • (1) L5-30R 120V 30A TWISTLOCK (29.2A/120V/3500W)
  • (1) 14-50R 120V/240V 50A (29.2A/120V/3500W)
  • (1) USB-A (2.1A/5V DC/10W)
  • (1) 12V DC Power Port/Plug (8.3A/12V DC/100W)
ENGINEERED IN THE USA

FIRMAN generators are made to endure every condition from cold winter nights to hot summer days to everything in between.

Industry-Leading Warranty

New FIRMAN generators are backed by a 3-year warranty. Refurbished generators have a limited 90 day warranty

Customer Support

Our skilled technicians located in Peoria, AZ are available 7 days a week to provide the support you need when you need it most. 

Running Watts

3500 Gas / 3200 LPG

Starting Watts

4400 Gas / 4000 LPG

FIRMAN Engine

208cc

6 Gallon Gas Tank

22 Hr Run Time

Specifications

Certifications
CARB Certified Yes
EPA Certified Yes
cETL Certified Yes
NOM Certified No
ANSI/PGMA G300-2018 Yes
UL Certified No
CARB Certified Yes
EPA Certified Yes
cETL Certified Yes
NOM Certified No
ANSI/PGMA G300-2018 Yes
UL Certified No
Output
Running Watts 3500 Gas / 3200 LPG
Starting Watts 4400 Gas / 4000 LPG
AC Voltage 120
Frequency (Hertz) 60
Decibels 69dB @ 1/4 load
Run Time Up to 18 Hrs
THD @ Full Load 3%
Running Watts 3500 Gas / 3200 LPG
Starting Watts 4400 Gas / 4000 LPG
AC Voltage 120
Frequency (Hertz) 60
Decibels 69dB @ 1/4 load
Run Time Up to 18 Hrs
THD @ Full Load 3%
Control Panel
Recoil Start Yes
Electric Start Yes
5-20R 120V 20A DUPLEX 1
L5-30R 120V 30A TWISTLOCK (29.2A/120V/3500W) 1
14-50R 120V/240V 50A (29.2A/120V/3500W) 1
USB-A (2.1A/5V DC/10W) 1
12V DC Power Port/Plug (8.3A/12V DC/100W) 1
CO Alert Yes
Recoil Start Yes
Electric Start Yes
5-20R 120V 20A DUPLEX 1
L5-30R 120V 30A TWISTLOCK (29.2A/120V/3500W) 1
14-50R 120V/240V 50A (29.2A/120V/3500W) 1
USB-A (2.1A/5V DC/10W) 1
12V DC Power Port/Plug (8.3A/12V DC/100W) 1
CO Alert Yes
Machine
Low Oil Shutoff Yes
Power Stream Alternator Yes
Cast Iron Sleeve Yes
Low Oil Shutoff Yes
Power Stream Alternator Yes
Cast Iron Sleeve Yes
Fuel System
Fuel Gas & LPG
Tank Size 6 Gal
Steel/Plastic Steel Gas Tank
Fuel Gas & LPG
Tank Size 6 Gal
Steel/Plastic Steel Gas Tank
Wheel Kit
Wheels 9" Never Flat Wheels
Handle Single Folding Handle w/Grip
Wheels 9" Never Flat Wheels
Handle Single Folding Handle w/Grip

Packaging

Unit
UPC 840876135624
Unit Dimensions 24.5" x 24.1" x 23"
Unit Length 24.5"
Unit Width 24.1"
Unit Height 23"
Unit Weight 119 Lbs
UPC 840876135624
Unit Dimensions 24.5" x 24.1" x 23"
Unit Length 24.5"
Unit Width 24.1"
Unit Height 23"
Unit Weight 119 Lbs
Carton
Carton Dimensions 28.7" x 21.1" x 21.3"
Carton Length 28.7"
Carton Width 21.1"
Carton Height 21.3"
Carton Weight 132 Lbs
Bonus Items L5-30P to TT-30R Adapter
Bonus Items Velcro Strap Hose Holder
Carton Dimensions 28.7" x 21.1" x 21.3"
Carton Length 28.7"
Carton Width 21.1"
Carton Height 21.3"
Carton Weight 132 Lbs
Bonus Items L5-30P to TT-30R Adapter
Bonus Items Velcro Strap Hose Holder

Manuals

WH03562OF Operators Manual English

download

WH03562OF Operators Manual Spanish

download

WH03562OF Operators Manual French

download

WH03562OF QSSG English

download

WH03562OF QSSG French

download

WH03562OF QSSG Spanish

download

Watch

CO Alert Overview

Watch

WH03562OF Overview

Watch

WH03562OF Maintenance

Watch

WH03562OF Unboxing

@FIRMANpowerequipment
Image of a Woman holding a handle to an Inverter Generator and walking towards a pick up truck and trailer cart.
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A man shows off his FIRMAN Accessories and Inverter Generator collection.
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A FIRMAN generator is sitting on the bed of a white pick up truck. The truck is parked against a concrete wall.
Image of a small dog and a FIRMAN Inverter Generator with a suitcase handle, outside on a camping ground.
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