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Firman T04073 - 4000/5000W Tri Fuel Generator

The Firman T04073 is a portable open frame tri-fuel generator with a rated wattage of 4,000 W and a starting wattage of 5,000 W.

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Description

Zoom on the Firman T04073

In a nutshell, the Firman T04073 is a portable generator mostly geared towards:

  • RV travellers who wish to upgrade their experience to another level
  • People occasionally participating in sporting competitions, open-air performances and outdoor festivals
  • Homeowners who want to be sure of their ability to power their fridges, cooking tools, heating and lighting equipment during power failures
  • Professionals who want to ensure that a power failure will not prevent them from working

In the sections ahead, the power characteristics, availability of various outlets, the portability, and any additional features of the device shall be discussed, including its emission compliance information.

Power & Run Time

The Firman T04073 in use

The Firman T04073

The Firman T04073 delivers 120/240V and benefits from a tri-fuel technology that allows it to run on gasoline, propane, or natural gas. When gasoline-powered, it enjoys a running wattage of 4,000W and a peak wattage of 5,000W. When propane-powered, it benefits from 3,600 rated watts and 4,500 peak watts. Its natural gas operation offers 3,200W of rated wattage and 4,000W of starting wattage.

With a noise rating of 67 dBA (less noisy than an office), the generator features a conventional pull-start mechanism, but also a simple and elegant electric starter (battery included).

The T04073, with a fuel capacity of 5 gallons, reaches a run time of around 14 hours at 50% load utilizing gasoline (fuel consumption around 0.36 GPH). Alternatively, it can reach a run time of around 9 hours (on a 20 lbs tank - propane consumption around 0.52 GPH) with propane.

Since the T04073 has a somewhat high THD (<14%), it is advisable to not use it for the powering of sensitive electronic devices.

Outlets

The control panel features the following 4 AC outlets:

Duplex 120V 20A (5-20R) GFCI
120V 30A (L5-30R) receptacle
120/240V 30A (L14-30R) receptacle

Even though this Firman generator isn't quite RV Ready, its L5-30R receptacle allows an easy RV connection via an L5-30P to TT-30R adaptor (included). Besides, since the T04073 bears a twist-lock L14-30R receptacle, it is transfer switch ready: it is easily connectible to a breaker box and can power your home in case of a power outage.

Portability

With its dimensions of L29.8 x W27.5 x H26.1 in, the conventional, open frame design of the Firman T04073 offers stability and allows the generator to be raised above ground level. The generator is designed for ideal use outdoors and in rough environments.

Even though this device may be technically portable (as in movable), manipulation and transportation without special equipment can be a challenge, as it weighs 123.4 pounds. However, its challenging mobility is solved by its wheel kit (⌀8") and its folding handle, which will ease its displacement, once it is on the floor.

Features

Panel of the Firman T04073

The T04073's control panel

The T04073's control center features a convenient meter showing you voltage, frequency and lifetime hours to aid you with the monitoring of its status and activity.

In addition to this info, a light indicator serves to show you when the generator is ready.

The generator allows for a quick, easy and convenient assessment of its gas level, as it is equipped with a built-in fuel gauge.

As for its security measures, the device features an automatic low oil shut-off and an overload protection (circuit breaker), letting you use it with a peace of mind.

The T04073 also benefits from Firman’s CO Alert carbon monoxide shutdown, which automatically shuts down the engine when harmful levels of carbon monoxide accumulate around the generator or a CO Alert fault occurs.

Along the basic documentation and an owner's manual (opens in a new tab), useful for starting the generator right away, the Firman T04073's package also includes these accessories: oil, tool kit, cover, propane hose, funnel and RV adapter.

Emissions

The Firman T04073 is EPA-approved and CARB-compliant. It can therefore be sold and purchased in all 50 states, including California.

Moreover, it features a spark arrestor and therefore, can be used in forested areas.

The unit also meets the ANSI/PGMA G300-2018 safety and performance requirements.

Product Video

The Firman T04073 versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Firman T04073 compare to multi-fuel generators of similar power (between 3500 and 4500 W).

  • As its dry weight is 123.4 pounds, the Firman T04073 is one of the heavier of the inverters which can generate 3500 to 4500 running watts. If weight matters to you, one of the champions in this power range is the WEN DF402iX with only 66.1 pounds.
  • As this generator can emit noise as low as 67 dBA, it finds itself in the average expected noise for this kind of power. For those who are looking for a less noisy device, we suggest the Westinghouse iGen4500DF. With just 52 dBA, it is one of the most quiet devices in this power range.
  • Since the T04073 boasts with a run time of around 14 hours at 50% load, it can be safely judged as a device of a higher run time than most multi-fuel generators of a comparable output. If autonomy is your priority, one of the devices of a similar power output with the highest run time is the Westinghouse iGen4500DF, reaching around 15 hours.
  • While the run time is an important parameter, it is dependent on the fuel tank's capacity and thus, doesn't say much on its own unless we consider fuel consumption as well. As this generator uses an estimated 0.36 GPH (gallon per hour) at a 50% load, it finds itself in the average gasoline consumption range of similar products. If fuel consumption is your top priority, we suggest to check out the Westinghouse iGen4500DF, which has a fuel consumption of only 0.23 GPH and thus, is one of the most efficient devices in our database.

Price comparison

As you can see from these interactive charts, when compared to other 3500-4500W multi-fuel generators, the Firman T04073 is on the average side of the price range.

Therefore, this generator nicely fits in the expected budget for this kind of product.

The bottom line

STRENGTHS:
  • In the expected price range
  • Tri-fuel
  • CO Alert technology
  • Several accessories included
  • GFCI Outlets
  • RV adapter included
  • Electric start
  • High run time
AVERAGE SPECS:
  • Acceptable noise (67 dBA)
  • Decent fuel efficiency
WEAKNESSES:
  • No remote start
  • On the heavy side (123.4 lbs)

Do you own the Firman T04073 and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

General
InverterNo
Parallel capableNo
RV readyNo
FuelTri-Fuel (gasoline/propane/natural gas)
Engine223 cc OHV 4-stroke
Starting systemRecoil, Electric
Warranty3 years
VoltageAC: 120/240V 60 Hz
Power
GasolineLPGNG
Running watts4,000 W3,600 W3,200 W
Starting watts5,000 W4,500 W4,000 W
Running amps (@120/240V)33.3/16.7 amps30/15 amps26.7/13.3 amps
Peak amps (@120/240V)41.7/20.8 amps37.5/18.8 amps33.3/16.7 amps
Run time @50% load14 h9 hN/A
Run time @25% loadUnknownUnknownN/A
Features
GFCI outletsYes
Covered outletsYes
Automatic Voltage RegulationYes
AC outlets
  • 1x Duplex 120V 20A (5-20R) GFCI
  • 1x 120V 30A (L5-30R)
  • 1x 120/240V 30A (L14-30R)
DC outletsNo
Data centerVFT
IndicatorsOutput ready
Fuel tankSteel, 5 gal
Fuel gaugeYes
Misc
Weight123.4 lbs
Approx. dimensions (L x W x H)29.8 x 27.5 x 26.1 in
Noise (lower limit)67 dBA
THD< 14%
ComplianceCARB, EPA, ANSI/PGMA G300-2018
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
NeutralBonded to frame
Accessories includedOil, funnel, tool kit, propane hose, RV adapter, cover, battery, and wheel kit
Country of originChina
SeriesTribrid
UPC840876140734

Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.

Spec Improvement×

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About FIRMAN Power Equipment

Founded in 1999, Firman Power Equipment is a company with a short, but established history in the power equipment industry. Based in Arizona, the company offers an immense range of products, including power tools, automotive equipment, storage utilities, work wear, but most importantly, a wide selection of generators of all sizes, designs and outputs. Interestingly, Firman is a wholly owned subsidiary of the China National Machinery Industry Corporation - a somewhat well renowned company in China and acts as a de facto distributor of their products in the US.

Warranty Information

The Firman T04073 is covered under a warranty for up to 3 years. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of Firman generators, please consult Firman's warranty policies (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-844-FIRMAN1 (844-347-6261).

Questions & Answers

What can it power?
Examples of items that can be simultaneously powered.
The examples below are based on a maximum load of 80% and estimated wattages. For a more accurate estimation, use our generator sizing calculator.
ItemRunning WattsStarting Watts
At homeSump pump (1/2 hp)10502150
Furnace fan (1/2 hp)8752350
Refrigerator (energy star)1921192
Vacuum cleaner10751175
Total3192 W4667 W
For campingRadiant heater13001300
RV refrigerator180600
Electric grill16501650
Set of 5 LED light bulbs5555
Total3185 W3605 W
For workTable saw18004500
Drain cleaner250250
Bug zapper8080
Total2130 W4830 W
Does the T4073 have a bonded neutral, and if yes, how to you make it unbonded ? (Asked May 07, 2023)

The neutral is bonded to the generator's frame. To unbond it, you may contact Firman for specific instructions, or refer to our article on bonding and floating a generator's neutral.

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