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What Costco’s Firman generator can do
Costco’s compared listing for the T07571 describes a portable tri-fuel generator with electric start, an 8-gallon gasoline tank, a listed weight of 212 pounds, and up to 12 hours of runtime at 50% load. Its rated output depends on the fuel:
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| Fuel | Starting watts | Running watts |
|---|---|---|
| Gasoline | 9,400 | 7,500 |
| LPG (propane) | 8,450 | 6,750 |
| Natural gas | 6,900 | 5,500 |
These are the Costco-listed T07571 figures, not a promise that every appliance combination will run: starting watts cover brief startup demand, while running watts are the more relevant limit for sustained use. Output is lower on propane and natural gas than on gasoline. Costco’s T07571 listing
Do not confuse the T07571 with the T07573
Costco also surfaces item 1900555, model T07573. Firman lists the T07573 in the same broad power class, with 9,400 starting/7,500 running watts on gasoline, 8,450/6,750 on LPG, and 6,900/5,500 on natural gas; its specifications include 120/240 V, an 8-gallon tank, up to 12 hours at half load, and a 211-pound weight. Similar headline ratings do not make the models interchangeable: use the model number on the product nameplate and the exact listing when checking specifications, manuals, and coverage. Costco’s T07573 listing · Firman’s T07573 product page
#1 Best Overall
- Perfect as a backup power source for larger homes or a dependable source of portable power
- 14,500 peak watts, 11,500 running watts (gasoline); 13,500 peak watts, 10,500 running watts (propane); 12,000 peak watts, 9,500 running watts (natural gas)
- Powered by a heavy duty 550cc 4-Stroke OHV Westinghouse Engine constructed with a durable cast iron sleeve; Runs for up to 19 hours on a 9.5 gal. fuel tank with built-in fuel gauge; up to 7 hours on a 20 lb. propane tank
- Engineered with low THD, so it's safe for sensitive electronics. Power phones, computers, TVs and more. Stay connected with people, news and entertainment during power outages, or on jobsites and campsites. Durable copper windings help your generator produce cleaner power, run cooler and last longer
- All Westinghouse portable generators are gunctionally tested in the factory and may contain minimum residual oil and/or fuel odor; EPA compliant; Backed by 3-Year limited service, labor, and parts coverage and Nationwide Customer Service Network
What Costco buyers and other reviewers say
Costco’s compared T07571 listing displayed 4.4 stars from 1,405 reviews when accessed in 2026. That is a positive retailer snapshot, not a controlled test or a measure of expected service life. Reviews can change as buyers add ratings.
A November 1, 2025, SlashGear article likewise described a 4.4-out-of-5 review snapshot. Its summary says positive users praised perceived reliability, easy starts, useful output, and value; negative reports included units that did not work out of the box, loud operation, and uneven experiences with Firman customer service. These are customer reports as summarized by a publication, not verified failure rates or a representative reliability study. SlashGear’s review summary
Rank #2
- TRI-FUEL FLEXIBILITY FOR ANY SITUATION: Run on gasoline, liquid propane, or natural gas with a simple dial turn, delivering 9,500 running watts and 12,500 starting watts to power home backup, job sites, or RV setups
- STABLE POWER WITH AUTOMATIC VOLTAGE REGULATION: Built-in AVR continuously stabilizes output voltage, protecting connected equipment from fluctuations and enabling reliable operation of motor-driven tools, pumps, and appliances
- 12,500 STARTING WATTS FOR HIGH-SURGE LOADS: The 500cc Generac OHV engine delivers 12,500 starting watts on gas — 32% more surge capacity than running output — handling simultaneous starts of air conditioners, sump pumps, and power tools
- COSENSE TECHNOLOGY WITH ELECTRIC START: Onboard COsense automatically detects rising carbon monoxide levels and shuts the generator down before reaching dangerous thresholds; push-button electric start with included 12V battery eliminates pull-cord effort
- EXTENDED RUNTIME WITH 7.5-GALLON FUEL TANK: Run up to 9.5 hours at 50% load on gasoline, 14 hours at 25% load, or connect to a natural gas line for virtually unlimited runtime; onboard fuel gauge lets you monitor levels at a glance
One Costco owner’s 2021 T07571 report described loud operation on propane under a mixed resistive and appliance load, as well as a propane cylinder cooling or freezing during sustained use. The owner’s account involved one unit, particular conditions, and a phone sound app, so it cannot establish typical noise or performance. A commenter relayed a Firman support response of 11–14% total harmonic distortion (THD); that is anecdotal and does not establish the T07573’s THD. Costco’s T07571 listing and owner discussion
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Costco lists 72 dB for the T07571, and at least one owner described it as loud in use. The listing does not supply measurement distance and load conditions for that figure, so it should not be compared directly with another generator’s decibel rating unless the test conditions match. At 212 pounds, this is also not a lightweight unit to reposition casually. Think through where it can sit outdoors with safe exhaust clearance, how its sound may affect people nearby, and how you will move it before an outage. Costco’s T07571 listing
Rank #3
- 13500 Peak Watts, 10500 Running Watts (Gasoline); 12500 Peak Watts, 9500 Running Watts (Propane); 10000 Peak Watts, 8500 Running Watts (Natural Gas); Remote Start with Included Key Fob, Electric and Recoil Start; Up to 19 Hours of Run Time on a 9.5 Gallon Fuel Tank with Fuel Gauge
- Features Two GFCI 120V 5–20R 20A Standard Household Receptacle, One Transfer Switch Ready 120V L14-30R 30A, and One RV Ready 120/240V 14–50R 50A; All Outlets Have Rubber Covers for Added Safety
- Powered by a Heavy Duty 500cc Westinghouse 4-Stroke OHV Engine Featuring a Long-Lasting Cast Iron Sleeve with Automatic Low Oil and Carbon Monoxide (CO) Shutdown, and Digital Hour Meter
- Plug-and-Play: Comes with a Remote Start Key Fob, 12V Battery Charger, Oil, and Oil Funnel, a Tool Kit, and a User’s Manual to Get You Started Right Out of the Box (Minimal Assembly Required)
- All Westinghouse Portable Generators are Functionally Tested in the Factory and May Contain Minimum Residual Oil and/or Fuel Odor; EPA Compliant; Backed By 3-Year Limited Service, Labor, and Parts Coverage and Nationwide Customer Service Network
Can it run on natural gas, and can it power a house?
Yes, the tri-fuel design supports gasoline, LPG, and natural gas. On natural gas, the listed T07571 output is 6,900 starting watts and 5,500 running watts—less than its gasoline rating. A compatible home gas connection and suitable installation are separate practical requirements; do not assume a connection is included or ready to use.
It can supply selected household loads if their combined running demand and startup surges fit within the generator’s output for the fuel being used. Make a load list before relying on it: identify each appliance’s running watts and any higher motor-start demand, then decide which loads can operate together. The highest advertised starting-watt figure is not continuous capacity.
Rank #4
- Power Your Entire Home - With 13,000 watts of power, the DS13000MXT Tri Fuel generator will keep your whole home running during a storm or power outage, while protecting your family from harmful fumes with CO Alert.
- Tri Fuel Technology - DuroStar Tri Fuel Technology allows your generator to run on either gasoline, propane, or natural gas, offering the freedom and flexibility of fuel choice.
- Fully Loaded Power Panel - The DS13000MXT comes with a push button start, a fuel selection knob, and a wide variety of outlets (including a transfer switch-ready 50 amp outlet).
- CO Alert - Our innovative CO Alert eliminates the threat of carbon monoxide poisoning by automatically shutting down the generator when harmful fumes are detected.
To feed household wiring, the operator’s manual describes a separate transfer switch and says it should be installed by a licensed electrician. The switch is not identified as included equipment. Never connect a portable generator to house wiring through an improvised method; use the correctly selected equipment and follow the manual. Firman manuals
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Operate it outdoors and stay with it
Firman’s operator manual says the generator is not intended to run unattended or to supply life-support equipment. It also warns about exhaust and carbon monoxide. Operate it outdoors, with exhaust positioned safely away from buildings and openings, and follow the exact manual for the model you own. Read the manual before starting or connecting the unit. Firman manuals
Best Value
- With 13,000 watts of power, the XP13000HXT Tri Fuel generator will keep your whole home running during a storm or power outage, while protecting your family from harmful fumes with CO Alert
- Run your generator on gasoline, propane, or natural gas. With Tri Fuel, we offer the ultimate freedom and flexibility of fuel choice
- Powerful 500cc OHV Engine: At the heart of this generator resides a robust DuroMax engine designed to provide you with the most power.
- The XP13000HXT comes with a push button start, a front facing interface that allows you to change your fuel type in seconds, and a wide variety of outlets including a transfer switch-ready 50 amp outlet
- Push Button Start and Remote Start: Turn on your generator with a simple push of a button, or use the remote to conveniently start your generator from a distance.
Verify coverage for the exact item
Firman’s T07573 product page states a three-year warranty, while Costco’s surfaced T07573 page lists four years. The available listings do not explain the difference. Confirm the warranty terms attached to the exact Costco item and model at purchase rather than assuming one term applies to both SKUs. Firman’s T07573 product page · Costco’s T07573 listing
Quick Recap
- Match the model number on the listing, nameplate, and manual.
- Confirm the fuel you expect to use and plan loads around that fuel’s running-watt rating.
- Check the warranty terms for the exact Costco item.
- Plan safe outdoor placement, exhaust clearance, transport, and—if connecting to household wiring—licensed installation of a separate transfer switch.
