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 in need of an emergency backup power for their essentials
- Professionals who want to be able to deliver results, even during a power failure
The following sections will present you in detail its power characteristics, the different outlets it offers, its overall portability, the extra features it benefits from, and any relevant emission compliance details.
Power & Run Time
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.
The generator features a conventional pull-start mechanism and also a simple and elegant electric starter (battery included). It is rated for a noise of 67 dBA (less noisy than a normal conversation).
With a fuel capacity of 5 gallons, the T04073 can operate for around 14 hours at 50% load using gasoline (fuel consumption around 0.36 GPH), or for around 9 hours (on a 20 lbs tank - propane consumption around 0.52 GPH) using propane.
As the T04073 has a relatively high THD (<14%), it is not recommended to use it to power sensitive electronic devices.
The control panel provides the upcoming 4 AC outlets:
This Firman generator features an L5-30R receptacle, enabling an easy RV connection via an L5-30P to TT-30R adaptor (included). However, it is still not quite RV ready. Besides, as the T04073 holds a twist-lock L14-30R receptacle, it is transfer switch ready: you'll easily be able to connect it to your breaker box to power your home during a power outage.
The design of the Firman T04073 is a typical, open frame, with the dimensions of L29.8 x W27.5 x H26.1 in, offering support and stability and enabling the possibility of raising it above ground level. The device has been designed for tough environments and demanding outdoor use.
Since the generator weighs 123.4 lbs, it will be incredibly difficult to manually lift it and transport it, even though it is technically considered to 'be portable' (in the sense that it is movable). Nevertheless, thanks to its wheel kit (⌀8") and its folding handle (a decent solution to its lack of maneuverability), the generator can be easily moved, once placed the ground.
The control panel of the T04073 includes a convenient meter, which displays voltage, frequency and lifetime hours, helpful for the monitoring of its status and activity.
In addition to this info, a light indicator shows you if the generator is ready.
The fuel level of the generator can be determined quickly, easily, and conveniently with the help of its built-in fuel gauge.
Security-wise, this product benefits from an overload protection (circuit breaker) and an automatic low oil shut-off, which gives you a complete peace of mind when using it.
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.
While the standard documentation and an owner's manual (opens in a new tab), helpful for starting the device promptly, come with the Firman T04073, the following accessories are also included: RV adapter, funnel, tool kit, propane hose, oil and cover.
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, so it is adequate for use in forested areas.
The unit also meets the ANSI/PGMA G300-2018 safety and performance requirements.
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 generators of similar power (between 3500 and 4500 W).
- At a weight of 123.4 pounds, the Firman T04073 places in the expected weight range of the generators in the 3500-4500 rated wattage range. If weight matters to you, one of the champions in this power range is the WEN GN400i with only 66.1 pounds.
- Since the generator's noise is rated at 67 dBA, it has the roughly average expected noise for a device of similar 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.
- The T04073 provides a higher run time than similarly powerful devices, reaching around 14 hours at 50% load. If autonomy is your priority, one of the devices of a similar power output with the highest run time is the Predator 4375, reaching around 16 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. This generator reaches an estimated fuel consumption of 0.36 GPH (gallon per hour) at a 50% load, making it average, for the previously mentioned wattage range. If you are concerned with gasoline efficiency, having a fuel consumption of just 0.23 GPH, the Westinghouse iGen4500DF is a device you could look out for.
As you can see from this interactive chart, when compared to other 3500-4500W 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
- In the expected price range
- CO Alert technology
- Several accessories included
- GFCI Outlets
- RV adapter included
- Electric start
- High run time
- Decent weight (123.4 lbs)
- Acceptable noise (67 dBA)
- Decent fuel efficiency
- No remote start
Features and Specifications
|Fuel||Tri-Fuel (gasoline/propane/natural gas)|
|Engine||223 cc OHV 4-stroke|
|Starting system||Recoil, Electric|
|Voltage||AC: 120/240V 60 Hz|
|Running watts||4,000 W||3,600 W||3,200 W|
|Starting watts||5,000 W||4,500 W||4,000 W|
|Running amps (@120/240V)||33.3/16.7 amps||30/15 amps||26.7/13.3 amps|
|Peak amps (@120/240V)||41.7/20.8 amps||37.5/18.8 amps||33.3/16.7 amps|
|Run time @50% load||14 h||9 h||N/A|
|Run time @25% load||Unknown||Unknown||N/A|
|Automatic Voltage Regulation||Yes|
|AC outlets|| |
|Fuel tank||Steel, 5 gal|
|Approx. dimensions (L x W x H)||29.8 x 27.5 x 26.1 in|
|Noise (lower limit)||67 dBA|
|Compliance||CARB, EPA, ANSI/PGMA G300-2018|
|Security||Low oil and overload protection, CO monitoring|
|Neutral||Bonded to frame|
|Accessories included||Oil, funnel, tool kit, propane hose, RV adapter, cover, battery, and wheel kit|
|Country of origin||China|
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.
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.
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?
|Item||Running Watts||Starting Watts|
|At home||AC (10,000 BTU)||1500||2200|
|Electric fry pan||1500||1500|
|Refrigerator (energy star)||192||1192|
|Total||3192 W||4192 W|
|For camping||RV AC (11,000 BTU)||1010||1600|
|Total||3190 W||3780 W|
|For work||Table saw||1800||4500|
|Electric fence (25 miles)||250||250|
|Total||2130 W||4830 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.
Couldn't find the right answer for you? Ask your own question.