Firman T07571 & T07573 Review: Are They Good?

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Find out in this review whether the Firman T07571 and T07573 tri fuel generators are good enough to be worth the investment.

First, a quick note is that the Firman T07571 and T07573 are basically the same besides an extra CO sensor, different visuals, and small price differences.

Firman T07573 review in short

The Firman T07571 and T07573 are good tri fuel generators overall.

However, there are even better tri fuel generators.

For example, the Champion 201169 8125 may offer fewer watts but is generally more reliable and budget-friendly than the Firman T07571 and T07573.

To run sensitive electronics, you likely want to go for the Champion 201176 9000 which is a tri fuel inverter generator.


  • Tri fuel feature adds a lot of flexibility
  • Good run time
  • A lot of power
  • 50 amp outlet
  • Has electric start


  • Higher THD is not suited for sensitive electronics
  • A few cases of technical issues
  • Loud noise levels

Some of the best uses for the Firman T07573 include:

  • Home backup power (keep high THD in mind)
  • Off-grid living
  • Certain events
  • Job sites
  • Farm projects

Firman T07573 performance in important categories

To complete this mini part of the review it can be helpful to see how the Firman T07571 and T07573 perform in important categories.

Performance CategoryFirman T07573 Score*Performance CategoryFirman T07573 Score*
Power Capacity9Fuel Efficiency7.5
Run Time9Ease Of Use8
Quiet Operation4Portability5
THD11%-14%Price Category$$
Reliability Reputation8.5Overall Expert Rating8.5
Current PriceCheck Price
Firman T07573 performance on a score of 10 compared to other generators*

Individual reviews compare the specific model to portable generators in general and sometimes scores are based on customer input

Firman T07573 key features

Choosing a portable generator can feel overwhelming with how many different details they have.

That being said, the smaller amount of key features below already offers a relatively good idea of what you can expect from the Firman T07571 and T07573.

FeatureFirman T07573 Detail
Fuel TypeTri Fuel: Gasoline,
Propane, And Natural Gas
Starting Watts9400 (Gas), 8450(LPG),
And 6900 (NG)
Running Watts7500 (Gas), 6750 (LPG),
And 5500 (NG)
Run Time @50% Load12 Hours (Gasoline)
Noise Levels74 dB At 50% Load
Outlets(1) 240V 50A 14-50R, (1) 240V
30A L14-30R Twistlock, (1) 120V
30A L5-30R Twistlock (1)
Duplex Of GFCI 120V
20A 5-20R Outlets
(Total Harmonic Distortion)
11%-14% At Full Load
Warranty*3 Years Limited Warranty
Price Category**$$
Check Current Price
Firman T07573 key features

*Warranties can vary from seller to seller

**Price category at the time of writing

Firman T07571 & T07573 THD

The first thing to know about the Firman T07571 and T07573 is that their THD (total harmonic distortion) is generally too high for sensitive electronics.

In simpler words, the power these generators offer can damage electronics like your TV, phone, and potentially even refrigerator.

You can resolve this by getting your own inverter or other ways to “clean up” the power from the Firman T07571 and T07573.

Another option is getting an additional small inverter generator for your sensitive electronics.

You could also choose one of the few tri fuel inverter generators like the Champion 201176 9000 instead.

If you plan to run devices that don’t need low THD or you have your own way to clean up the power, you can go over the rest of the Firman T07571 & T07573 review.

What will the Firman T07573 run?

Even if you know how many watts the Firman T07571 and T07573 offer, it could be unclear what these mean in terms of appliances and tools.

When running on gasoline and propane, the Firman T07571 and T07573 will often not have a problem running even your bigger devices separately.

Due to the smaller watt capacities on natural gas, starting and running bigger things like a 4-ton central air and clothes dryer could be just a bit too much.

Besides that, THD issues aside, the Firman T07571 and T07573 offer enough power to run multiple smaller and medium devices at the same time.

For example, a table saw and a hot water heater should be no problem for these tri fuel generators.

At least if you use gasoline or propane and start these devices up in the right sequence.

It is often smart to check the more in-depth article on what a 7000 watt generator will run to make sure the Firman T07571 and T07573 are strong enough for you.

Firman T07573 run times

It is easy to find that the Firman T07571 and T07573 can run for 12 hours at 50% load on a tank of gasoline.

However, if you are interested in a tri fuel generator, you likely also want to have an idea of propane and natural gas run times for different quantities of fuel.

At half load, the Firman T07573 uses about 31ft³ /hr (3.2L/hr) of propane.

In simpler words, the Firman T07573 runs about 11.25 hours on a 40-lb propane tank at 50% load.

On natural gas, you will generally not have a certain run time limit.

However, it can be helpful to know that the Firman T07573 uses about 86ft³ /hr(2.4m³ /hr) at 50% load.

Firman T07573 customer reviews insights

Even if you like the features the Firman T07571 and T07573, you want to take a look at the customer reviews.

This is because the list of specifications does not give you an idea of potential high rates of technical issues.

In the case of the Firman T07571 and T07573, there are a few reviews where customers have technical issues.

At the same time, this is within reasonable limits so it looks like the Firman T07571 and T07573 are still relatively reliable.

Besides that, the suboptimal reviews mention the high noise levels and high THD.

These things are somewhat expected at this power level and for the typical tri fuel generator.

Firman T07573 alternatives

The Firman T07571 and T07573 are good tri fuel generators but they are not the only options on the market.

For example, the Champion 201169 8125 may be slightly weaker but is generally also more reliable and more budget-friendly.

Additionally, if you want an inverter tri fuel generator that is suited for running sensitive electronics, you will likely prefer the Champion 201176 9000.

You could also go for the Westinghouse wGen9500TFC instead of the Firman T07571 and T07573 if you want more power at a slightly bigger investment.

Is the Firman T07573 worth it?

In terms of the value you get, the Firman T07571 and T07573 can definitely be worth the investment.

Especially if you have trouble finding any other tri fuel generators during a power outage.

At the same time, it is worth noting that you will likely prefer some of the alternatives mentioned in this Firman T07573 review even slightly more.

Other Firman T07573 specs

You may find it easier to make a decision about the Firman T07571 and T07573 with certain specs I did not mention in the review yet.

Additionally, the Firman T07573 manual offers even more information about certain parts, what to do when troubleshooting, and more.

SpecificationFirman T07573 Detail
Voltage240 Volts
Fuel Tank Capacity8 Gallons (Gasoline)
Gasoline Fuel Efficiency
(kWh Per Gallon)
Outlet CoversYes
Engine Displacement439cc
Recoil Pull StartYes
Electric StartYes
Low Oil ShutdownYes
Fully Enclosed DesignNo
AC Frequency60 Hz
Remote StartNo
Digital Smart LCD
Hour MeterYes
Fuel GaugeNot Mentioned
Wattage MeterNo
Run Time RemainingNo
Engine Type4 Stroke
Generator Operation
Parallel ReadyNo
Country Of OriginNot Mentioned
Dimensions29.8″ L x 27.5″ W x 26.1″ H
Weight213 lbs (96.6 kg)
Check Current Price
Other Firman T07573 specs

Firman T07573 FAQ

How long will a Firman T07571 run on gasoline?

A Firman T07571 will run about 12 hours at 50% load on a full tank of gasoline.

How long will a Firman T07573 run on propane?

A Firman T07573 will run about 11.25 hours at 50% load on a 40-lb propane tank.

How much oil does a Firman T07573 take?

The Firman T07573 has an oil capacity of 37.2 fluid ounces which is about 1.1 liters.

How many decibels is a Firman T07573?

A Firman T07573 is about 74 decibels at 50% load.

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Mats is the founder and head editor of Generator Decision. With a combination of critical thinking, tireless research, and a healthy interest in electronics he helps people find the right generators and how to use these. At this point in the journey, Mats has done research on hundreds of portable generators.