How much power does the GENMAX GM15000ET give you?
On gas, this model is rated for 11,000 running watts and 15,000 starting watts. Running watts are the power available while your appliances are on. Starting watts are a short burst to help things like refrigerators and pumps turn on. You cannot use that bigger number for appliances that need steady power.
| Fuel | Running watts | Starting watts |
|---|---|---|
| Gasoline | 11,000 W | 15,000 W |
| Propane | Not confirmed | Not confirmed |
| Natural gas | Not confirmed | Not confirmed |
The details for this model
Model: GM15000ET. Manufacturer part number: GM 15000ET. These are published specifications, not results from our own testing. If a detail is missing, we leave it marked rather than use a number from a similar generator.
- How it starts
- Electric, remote and pull cord
- Voltage
- 120/240V
- Gas tank
- 10.56 gal
- How long it runs
- Not confirmed for this model
- Weight
- Not confirmed for this model
- Size (L × W × H)
- Not confirmed for this model
- Outlets
- Not confirmed for this model
- Generator type
- Conventional
- Power smoothness (THD; lower is generally smoother)
- Not confirmed for this model
- Carbon monoxide shutdown
- CO detection
- Noise
- Not confirmed for this model
- Warranty
- 1 year per manufacturer page
A 120V outlet powers ordinary household plug-in devices. Some pumps and larger equipment need 240V. Inverter models use electronics to control the electricity they supply. THD measures how smooth that electricity is; a lower number generally means smoother power. Check your device instructions before connecting electronics.
Sources: Manufacturer specifications / manual ·
How long will it run?
We have not confirmed a runtime figure that says how much power was being used. The listed gas tank holds 10.56 gal. The more power you use, the sooner you will need fuel. A runtime measured at 25% load means the generator was only supplying a quarter of its running power, not working flat out.
Keep approved gas containers, rotate stored fuel, and plan where you can refill them. A bigger wattage number will not help if you run out of fuel. Read our fuel-storage guide →
What can you run during an outage?
Start by listing the appliances you need most. Check both their running watts and the extra power they need to start. A refrigerator, for example, may need much more power for a moment when its compressor kicks on.
Here is an example, not a test of this generator: a refrigerator using 600 running watts, plus 100 watts of lights and 100 watts for a router and other small devices, adds up to 800 watts. If that refrigerator needs 1,800 watts to start, the total briefly reaches 2,000 watts. Your appliances may use different amounts.
That example is within the listed gasoline running and starting ratings. You still need to check your own refrigerator, each outlet’s limit, and anything else that may turn on at the same time. If you use propane or natural gas, check those ratings separately.
A 1,500-watt heater uses a lot of power on its own. Follow its connection instructions; many portable heaters must plug directly into a suitable wall outlet. For a well pump or central air conditioner, have an electrician check voltage, running power, and startup demand. A 240V outlet alone does not guarantee enough power. Work out how much power you need →
What we like and what to consider
Reasons to consider it
- Runs on gas, propane, or natural gas.
- 11,000 running watts on gas.
- 240V output for compatible appliances or a professionally installed home connection.
Things to keep in mind
- Confirm its weight before planning how to move it.
- No confirmed propane rating is available.
- There is no complete noise test to compare with other models.
What owners are saying
We do not have enough owner feedback for this exact model to give a fair summary. Reviews for a similar generator, or another option on the same Amazon page, may describe a different machine. Before buying, check recent reviews for the full model number and find out how the seller handles service and returns.
Starting, moving, and maintenance
The listed starting options are: electric, remote and pull cord. Keep the starter battery charged as the manual recommends. Practice any backup starting method before an outage. Check its weight and size before deciding where to store it.
The listed warranty is 1 year per manufacturer page. Read the full terms, including whether your seller and intended use are covered. Follow the manual for oil type, oil changes, and storage. Keep track of running hours during a long outage. See our maintenance guide →
Other generators to compare
Westinghouse WGen11500TFc →
This generator can run on gas, propane, or natural gas, giving you more ways to keep things running during an outage. Check the output for the fuel you plan to use. It is a large, heavy machine, so consider storage, noise, and installation before buying.
11,500 running watts on gas · Tri-fuel · 120/240V
Westinghouse WGen10500DFc →
If you want plenty of power from gas or propane and do not need natural gas, this model is worth comparing. The similarly named WGen10500TFc uses three fuels, but the two models have different ratings and features.
10,500 running watts on gas · Dual fuel · 120/240V
Westinghouse WGen10500TFc →
This model lets you choose gas, propane, or natural gas. You get different amounts of power from each one, so use the rating for your chosen fuel when adding up your appliances. A natural-gas connection needs professional installation.
10,500 running watts on gas · Tri-fuel · 120/240V
Questions about the GENMAX GM15000ET
How much running power does it provide?
11,000 watts on gasoline; Output not confirmed on propane; Output not confirmed on natural gas. Starting watts are only available briefly, not for steady use.
Is it an inverter generator?
No. It is a conventional generator. A voltage regulator does not make it an inverter. Check your electronics’ power requirements before connecting them.
Can I use it in a garage if it has CO shutdown?
No. Never run a generator in a garage, even with the door open. Use it outdoors at least 20 feet from homes and openings, with exhaust pointed away. Carbon monoxide shutdown is extra protection; it does not make indoor use safe.
Can I connect it to my house?
Its 120/240V output may work with a suitable home connection. Have an electrician choose and install the right transfer equipment and check the generator’s wiring setup. Never connect a generator to a household wall outlet.
Should you consider the GENMAX GM15000ET?
This GENMAX runs on gas, propane, or natural gas and provides 11,000 running watts on gas. It is a conventional generator, not one of the brand's inverter models. Its two-wire start feature does not replace the equipment or installation needed to connect it safely to a home.
Check Price on AmazonWhere the information comes from
We use the sources below to compare specifications and features. We have not personally tested this generator.
- Manufacturer specifications / manual
- CDC generator safety guidance ↗
- How we put our reviews together