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Firman W03663OF Generator 3650W/4200W 50 Amp Electric Start With CO Alert New
Firman W03663OF Generator 3650W/4200W 50 Amp Electric Start With CO Alert New - view 2
Firman W03663OF Generator 3650W/4200W 50 Amp Electric Start With CO Alert New - view 3
Firman W03663OF Generator 3650W/4200W 50 Amp Electric Start With CO Alert New - view 4

FIRMANModel W03663OF

Firman W03663OF Generator 3650W/4200W 50 Amp Electric Start

  • Peak4,200W
  • Running3,650W
  • FuelGasoline
  • StartElectric
  • Outlet50 A
Black Friday price
$569.00

Black Friday price ends in —

In stock Ships within 24 hours

Free delivery Fri, Nov 6 – Wed, Nov 11 if you order today, by UPS or FedEx Ground to your door.

  • Free shipping48 states + DC
  • 30-day returnsReturn shipping on us
  • Full warrantyBrand-new, from the maker
  • Secure checkoutEncrypted by Stripe
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Questions before you buy? Our small team in Wilmington, NC answers every message personally. Email [email protected]

The FIRMAN W03663OF Generator is the perfect solution for your home or job site power needs.

Running watts
3,650 W
Starting watts
4,200 W
Start
Electric
Largest outlet
50 A
Safety
CO shutdown sensor
SKU: W03663OF
Category: , ,

The FIRMAN W03663OF Generator is the perfect solution for your home or job site power needs. Its 208cc engine, electric start, and recoil start will start up your generator quickly and easily. With a low oil shut off and cast iron sleeve, you can be sure that this generator is built to last. With a running wattage of 3650W and a starting wattage of 4500W and up to 22 hours of runtime at 25% load, you can power your appliances, tools, and lights with the confidence of knowing that your power needs are met. The 6-gallon tank and eco mode let you maximize fuel efficiency. At just 116 lbs, the W03663OF is lightweight and portable. The quiet 67dB sound rating at ¼ load adds to its convenience.

Run time on a full tank

25% load22 hrs

As published by the manufacturer. Real run time depends on load and fuel.

Full specifications

BrandFIRMAN
ModelW03663OF
Running watts3,650 W
Starting watts4,200 W
StartElectric
Largest outlet50 A
SafetyCO shutdown sensor
UPC / GTIN00840876136638
How it shipsUPS or FedEx GroundTo your door, free
Order today, deliveredFri, Nov 6 – Wed, Nov 11Leaves our warehouse within 24 hours

Tracking is emailed as soon as it ships.

We ship to the 48 contiguous states and Washington, DC. Shipping details · 30-day free returns

Brand-new, with the full manufacturer’s warranty. The terms are set by FIRMAN and included in the box. If something goes wrong, contact us first: we confirm the next steps within 2 business days and help you file the claim.

How warranty claims work

What it can run

3,650 W running, 4,200 W starting

Pick what you want to power at the same time.

Typical wattages – check the label on your own appliances. Where only one figure is published, running watts are estimated at 80% of the starting figure. Connect to house circuits only through a transfer switch or interlock fitted by a licensed electrician.

Compare similar generators

Same power class, side by side.

SpecificationFirman W03663OF Generator 3650W/4200W 50 Amp Electric Start With CO AlertThis generator$569.00Champion 200977 3500W/4250W Generator Dual Fuel Inverter Open Frame$449.00Maxpeedingrods MXR4000GT-US Dual Fuel Inverter Generator 3200W/4000W Low THD Parallel RV Ready CO Alert Bluetooth Control$519.00
Running watts3,650 W3,500 W3,200 W
Starting watts4,200 W4,250 W4,000 W
Fuel—Gasoline or propaneGasoline or propane
StartElectric——
Largest outlet50 A——
SafetyCO shutdown sensor—CO shutdown sensor
LinkYou are hereView →View →

Questions and answers

Answered by our team in Wilmington. Can’t find yours? Ask below.

Can I connect this generator to my house?
Only through a transfer switch or an interlock kit installed by a licensed electrician. Never plug a generator into a wall outlet: it can back-feed the utility line and endanger line workers. Connecting safely.
What can it run at the same time?
Use the What it can run planner above: tick your appliances and it checks both the running load and the start-up surge against this generator.
Does it ship with oil?
It depends on the manufacturer. If oil is included it is listed under What’s in the box; otherwise use the grade given in the owner’s manual before the first start.
Can I use it in the rain?
Not uncovered. Run it on a dry surface under an open, canopy-like cover, at least 20 feet from doors, windows and vents, and never in a garage.
How will it be delivered?
Free, by UPS or FedEx Ground to your door, usually within 2–5 business days after it ships. Tracking is emailed as soon as it ships.
What if it arrives damaged?
Photograph it and email us within 48 hours of delivery. We replace or refund damaged items at no cost to you.
Ask a questionWe reply personally by email.

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