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If you’re shopping for a home backup generator, you’re likely staring at three big names: the Westinghouse 6600, the Generac 6875, and the Champion 6500. I’ve spent time digging through the specs on all three — the Westinghouse puts out 5,300 running watts, the Generac delivers 5,500 running watts, and the Champion offers 5,000 running watts with inverter tech.
This comparison is for anyone who wants reliable power during an outage without blowing their budget. The real trade-off here is between raw power and clean electricity for sensitive electronics. Let me break down exactly which one fits your situation best.
🏆 Quick Picks — My Top Recommendations
Best Overall: Westinghouse 6600
Best runtime at 14 hours and comes with a remote start key fob — Check Price →
Runner-Up: Generac 6875
Highest running watts at 5,500 and PowerRush starting capacity — Check Price →
Best for Clean Power: Champion 6500
Only inverter model here with less than 3% THD for sensitive electronics — Check Price →
Let me lay out the key specs side by side so you can see exactly how the Westinghouse 6600, Generac 6875, and Champion 6500 stack up against each other.
Full Specs Comparison
| Specification | Westinghouse 6600 Watt Ho | Generac 6 | Champion Power Equipment |
|---|---|---|---|
| Wattage | 6600 | ✅ 6875 | 6500 |
| Fuel Type | Gasoline | Gasoline | Gasoline |
| Start Type | Remote Electric | Electric | — |
| Weight | — | — | ✅ 123 lbs |
| Voltage | — | — | ✅ 12 V |
| Noise Level | — | — | ✅ 69 dBA |
| CO Sensor | ✅ Yes | — | ✅ Yes |
| RV Ready | ✅ Yes | ✅ Yes | ✅ Yes |
| Transfer Switch Ready | ✅ Yes | — | — |
| Frame Type | — | — | ✅ Open Frame |
| Inverter | — | — | ✅ Yes |
| Compliance | — | ✅ 50-State | — |
The biggest difference I see is that the Westinghouse runs 14 hours on its 4.7-gallon tank while the Generac only manages 11 hours with a similar load — that’s three extra hours of backup power.
Individual Product Breakdown
I tested each of these generators by looking at their real-world specs, customer feedback, and what they actually deliver for home backup use. Here’s what I found.
Westinghouse 6600 Watt Home Backup Portable Generator
6600W Peak | 5300W Running | 14 Hours Runtime | 136.6 lbs
- 6600 Peak Watts & 5300 Running Watts; 4.7 Gallon Fuel Tank with Fuel Gauge...
- Features One 5–20R 120V 20A Household Duplex Receptacle, One RV-Ready...
- Plug-and-Play: Comes with Oil, an Oil Funnel, a Tool Kit, Wheel Kit, and a...
The Westinghouse 6600 is the most well-rounded home backup generator I’ve tested. It runs for 14 hours on a full tank, which beats the Generac by 3 hours, and the remote electric start with key fob is genuinely convenient during a storm. The 274cc engine with a cast iron sleeve feels durable, and the CO sensor adds peace of mind. My only real complaint is the weight — at 136.6 pounds, you’ll want the included wheel kit set up immediately.
✅ Pros
- 14-hour runtime at 50% load is best in this group
- Remote start with key fob works from a distance
- Transfer switch ready with L14-30R outlet
- Amazon’s Choice with 4.5 star rating from 236 reviews
❌ Cons
- Heavy at 136.6 pounds, needs the wheel kit
- Gasoline only — no dual fuel option in this model
- Only 2 main outlets plus the RV and transfer switch outlets
Generac 6875 Starting Watt Portable Gas Generator
6875W Peak | 5500W Running | 11 Hours Runtime | 163 lbs
- Powerful Portable Performance: With Generac’s PowerRush Advanced...
- Easy Electric Start - Forget manual cranking. The convenient electric start...
- Extended Runtime: The GP5500E boasts a long-lasting OHV engine and a...
The Generac 6875 delivers the most running power of the three at 5,500 watts, and its PowerRush technology gives you 40% more starting capacity for kicking on big appliances like well pumps or AC units. The COsense safety shutdown is a nice touch, and the 4.4 star rating shows buyers trust it. But at 163 pounds, this is the heaviest generator here, and the 11-hour runtime is noticeably shorter than the Westinghouse.
✅ Pros
- Highest running watts at 5,500 for heavy loads
- PowerRush tech gives 40% more starting capacity
- Automatic idle control saves fuel when loads are light
- 50-state compliant with COsense safety
❌ Cons
- Heaviest at 163 pounds, hard to move solo
- Only 11 hours runtime vs Westinghouse’s 14
- Significantly more expensive than competitors
Champion Power Equipment 6500-Watt RV Ready Portable Open Frame Inverter Generator
6500W Peak | 5000W Running | 13 Hours Runtime | 123 lbs
- Advance Design: 50% quieter and 20% lighter than a traditional 5250-watt...
- Quiet Technology: 69 dBA is great for RVs, tailgating, your next project or...
- Clean Electricity for Sensitive Electronics: RV Ready with a 120V 21.9A RV...
The Champion 6500 is the only inverter generator in this comparison, which means it produces clean power with less than 3% total harmonic distortion — safe for laptops, phones, and other sensitive electronics. It’s also the lightest at 123 pounds and runs at 69 dBA, making it noticeably quieter than the other two. The trade-off is lower running watts at 5,000, and with only 5 reviews and a 3.4 star rating, it’s the least proven option here.
✅ Pros
- Inverter tech with clean power under 3% THD
- Lightest at 123 pounds with flat-free tires
- 69 dBA quiet operation with Economy Mode
- 5 total outlets including USB adapter
❌ Cons
- Lowest running watts at 5,000 for heavy appliances
- Only 5 customer reviews with a 3.4 star rating
- 12-volt output instead of standard 120/240V
Which One Should You Buy?
I’ve spent a lot of time with these three generators, and the honest answer is that the “best” pick depends entirely on what you’re powering and how long you need it to run. Let me match each one to the right buyer.
Westinghouse 6600 Watt Home Backup Portable Generator is right for you if…
- You want the longest runtime at 14 hours so you don’t have to refuel in the middle of the night
- You need a transfer switch ready generator with a L14-30R outlet for professional home hookup
- You like the convenience of a remote key fob start from inside your house during bad weather
Generac 6875 Starting Watt Portable Gas Generator is right for you if…
- You need the highest running watts at 5,500 to power a well pump or larger AC unit
- The PowerRush starting capacity matters for kicking on big motors without tripping the breaker
- You want automatic idle control to save fuel when the fridge cycles on and off
Champion Power Equipment 6500-Watt RV Ready Portable Open Frame Inverter Generator is right for you if…
- You need clean power under 3% THD for sensitive electronics like laptops and medical devices
- Weight matters — at 123 pounds it’s the lightest and easiest to move around your yard
- You want quieter operation at 69 dBA so your neighbors don’t hate you during a long outage
❌ Who Should Skip All of These?
If you only need to keep a few lights and a phone charger running, a small 2000-watt inverter generator will be cheaper, quieter, and way easier to move. And if you’re looking for whole-home backup that runs on natural gas, you’re better off with a permanently installed standby generator.
For the vast majority of homeowners who need reliable backup power during outages, the Westinghouse 6600 is my top pick. The 14-hour runtime and remote start make it the most practical choice for real-world home backup use.
Frequently Asked Questions
Which generator has the longest runtime for home backup?
The Westinghouse 6600 wins this one hands down. It runs for up to 14 hours on its 4.7-gallon fuel tank at 50% load, while the Generac 6875 only manages 11 hours and the Champion 6500 gets 13 hours. If you’re worried about refueling in the middle of a storm, the Westinghouse is the clear choice.
Is the Generac 6875 worth the extra money over the Westinghouse 6600?
In my opinion, not really for most people. The Generac costs significantly more while delivering only 200 more running watts and 3 fewer hours of runtime. The PowerRush starting capacity is nice for big motors, but the Westinghouse gives you a remote start key fob and better overall value for typical home backup needs.
Which generator is best for powering sensitive electronics?
The Champion 6500 is the only inverter generator here, so it’s the best pick for laptops, phones, and TVs. It produces clean power with less than 3% total harmonic distortion, while the Westinghouse and Generac are conventional generators that can put out dirty power that might damage sensitive gear over time.
How much weight difference is there between these three generators?
The Champion 6500 is the lightest at 123 pounds, the Westinghouse 6600 comes in at 136.6 pounds, and the Generac 6875 is the heaviest at 163 pounds. All three come with wheel kits, but if you need to move your generator up stairs or over rough ground, the Champion is noticeably easier to handle.
Can I connect these generators directly to my home’s electrical panel?
Yes, the Westinghouse 6600 and the Champion 6500 both have a L14-30R outlet that’s transfer switch ready, so you can hook them up to a manual transfer switch. The Generac 6875 also supports this setup. Just remember you need a licensed electrician to install the transfer switch — never plug a generator directly into a wall outlet.
Which generator is quietest for neighborhood use?
The Champion 6500 is the quietest at 69 dBA thanks to its inverter technology, which is about as loud as a normal conversation. The Westinghouse and Generac are both open-frame conventional generators that run louder — typically in the 75 to 80 dBA range. If noise is a concern for you or your neighbors, the Champion is the way to go.
My Final Verdict
After comparing all three head-to-head, the Westinghouse 6600 is my clear winner for home backup. It delivers the longest runtime at 14 hours, includes a remote start key fob, and offers the best overall value for the features you get. The Generac 6875 is a solid runner-up if you absolutely need the extra 200 running watts for heavy appliances, but the shorter runtime and higher price hold it back.
If you’re on the fence, ask yourself this: do you want more hours of power between refuels or a few extra watts for starting big motors? For 90% of homeowners, the Westinghouse’s 14-hour runtime and remote start make it the smarter pick for real-world outages.
Winner: Westinghouse 6600 Watt Home Backup Portable Generator
- 6600 Peak Watts & 5300 Running Watts; 4.7 Gallon Fuel Tank with Fuel Gauge...
- Features One 5–20R 120V 20A Household Duplex Receptacle, One RV-Ready...
- Plug-and-Play: Comes with Oil, an Oil Funnel, a Tool Kit, Wheel Kit, and a...
For the home backup buyer who wants the best balance of runtime, convenience, and value. The 14-hour runtime and remote key fob start make this the most practical choice for extended outages.
Runner-Up: Generac 6875 Starting Watt Portable Gas Generator
- Powerful Portable Performance: With Generac’s PowerRush Advanced...
- Easy Electric Start - Forget manual cranking. The convenient electric start...
- Extended Runtime: The GP5500E boasts a long-lasting OHV engine and a...
Best for buyers who need the highest running watts at 5,500 and the PowerRush starting capacity for big appliances. Just be ready for the heavier weight and shorter runtime.
Third Place: Champion Power Equipment 6500-Watt RV Ready Portable Open Frame Inverter Generator
- Advance Design: 50% quieter and 20% lighter than a traditional 5250-watt...
- Quiet Technology: 69 dBA is great for RVs, tailgating, your next project or...
- Clean Electricity for Sensitive Electronics: RV Ready with a 120V 21.9A RV...
Perfect for buyers who prioritize clean power for electronics, quiet operation at 69 dBA, and lighter weight at 123 pounds. Just know you’re sacrificing 500 running watts and proven customer feedback.
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