Quick verdict
For true whole-house coverage, the Generac Guardian 10kW standby is my top pick. It ships with a 100-amp 16-circuit transfer switch, installs permanently outside, and starts automatically when the grid drops, so essential circuits stay live without you touching anything.
Generac Guardian 10kW Home Standby Generator
This 10kW standby is built for automatic whole-house backup and comes with a 100-amp, 16-circuit transfer switch so your essential circuits switch over on their own during an outage. It runs on natural gas or liquid propane, uses True Power Technology for under 5 percent harmonic distortion, and adds Wi-Fi monitoring through Mobile Link. It is backed by a 5-year limited warranty.
Check price on Amazon →Best generator for whole house: I compare Generac standby units and dual-fuel portable backups by wattage, transfer switch, fuel type, and automatic start.
Why you should trust this guide
I research generators the way a homeowner shopping for backup power would: by reading the full manufacturer specs, the outlet and transfer-switch details, and the fuel options for every unit, then lining them up against what a whole house actually needs to stay running. I have not physically installed these units, and I say so plainly. What I can do is compare the published wattage, transfer-switch capacity, and fuel type side by side so you can match a generator to your home instead of guessing.
Whole-house backup is a bigger decision than a camping generator. The wrong pick either leaves you short on power in an outage or has you paying for capacity and fuel you never use. My goal is to explain the tradeoffs clearly, keep the numbers grounded in each product’s own listing, and flag the honest limitations so you can decide between a permanent standby unit and a movable portable one.
How we evaluated
I focused on the criteria that decide whether a generator can truly back up a house: rated (running) wattage versus peak wattage, the type and amperage of the included or compatible transfer switch, and whether the unit starts automatically or needs you to fire it up by hand. I also weighed fuel type, since natural gas and propane change refueling and run-time math compared with gasoline.
From there I looked at practical ownership factors: warranty length, remote monitoring, cold-weather features, and whether professional installation is required. Standby units win on convenience and automatic transfer but demand a licensed install and a fuel line. Portables cost less and can move to a job site, but you handle starting, refueling, and outdoor placement every time the power drops. I did not invent any numbers; every spec cited comes from the product listing.
What to look for
- Running wattage vs peak wattage: Size to your running load first, then confirm the peak covers motor startup surges from AC and pumps.
- Transfer switch: Automatic transfer switches (like the 100-amp and 200-amp units here) move the load for you; portables usually need a manual transfer switch you buy and wire separately.
- Fuel type: Natural gas means no refueling, propane stores well, and gasoline is convenient but needs manual refills during long outages.
- Automatic vs manual start: Standby units start themselves, which matters if you travel; portables only run when you are home to start them.
- Installation requirements: Standby generators need a licensed electrician and often a permit; portables are ready to run out of the box.
- Cold-weather readiness: Oil-level sensors, cold-start help, and shielded intakes matter if you face freezing outages.
- Warranty and monitoring: A multi-year warranty and Wi-Fi or cellular monitoring add peace of mind for a unit you rely on rarely but urgently.
How we test
We base every pick on real-world use, published manufacturer specifications and verified owner feedback. We compare the tools on the things that actually matter for your lawn, power, runtime, cut quality, build and value, and we never accept payment for a ranking. When we have not used a specific model first-hand, we say so.
The picks at a glance
| Tool | Best for | Score | |
|---|---|---|---|
| Generac Guardian 10kW Home Standby Generator | Best Overall | Check price | |
| Generac Guardian 22kW Home Standby Generator | Best Value | Check price | |
| Westinghouse 12500 Watt Dual Fuel Home Backup Portable Gener | Best Premium | Check price | |
| Generac 26kW Home Standby Generator | Best Budget | Check price | |
| DuroMax XP13000EH 13 | Also Great | Check price |
The picks, reviewed
Generac Guardian 10kW Home Standby Generator
This 10kW standby is built for automatic whole-house backup and comes with a 100-amp, 16-circuit transfer switch so your essential circuits switch over on their own during an outage. It runs on natural gas or liquid propane, uses True Power Technology for under 5 percent harmonic distortion, and adds Wi-Fi monitoring through Mobile Link. It is backed by a 5-year limited warranty.
Reasons to buy
- Remote Monitoring Anywhere: With Generac 7172 10kW Mobile Link Wi-Fi connectivity, effortl
- Whole House Protection: Keep your home powered during outages with Generac’s 100 Amp 16-ci
- Long-Term Assurance: Backed by a 5-Year Limited Warranty, this automatic transfer switch d
- High-Quality 10kW Power: True Power Technology delivers clean, stable 10,000 watts with un
- Crafted for Excellence: Proudly engineered and assembled in the USA, our generators stand
Reasons to avoid
- Generac recommends installation by a licensed electrician, so it is not a plug-in unit
- 10kW may not cover a large home running central air plus a well pump at once
Generac Guardian 22kW Home Standby Generator
Stepping up to 22kW gives you far more headroom, and it ships with a 200-amp NEMA 3R smart transfer switch designed for whole-home coverage rather than just select circuits. It shares the same True Power Technology, natural gas or propane fuel, Mobile Link Wi-Fi, and 5-year limited warranty as the smaller Guardian.
Reasons to buy
- Remote Monitoring Anywhere: With Generac 7043 22kW Mobile Link Wi-Fi connectivity, effortl
- Whole House Protection: Enjoy comprehensive coverage with Generac's 200 Amp NEMA 3R smart
- Long-Term Assurance: Backed by a 5-Year Limited Warranty, this automatic transfer switch d
- High-Quality 22kW Power: True Power Technology delivers clean, stable 22,000 watts with un
- Crafted for Excellence: Proudly engineered and assembled in the USA, our generators stand
Reasons to avoid
- Requires professional installation and a gas or propane supply
- Overkill and more expensive to run than needed for a small home
Westinghouse 12500 Watt Dual Fuel Home Backup Portable Gener
This portable unit puts out 9,500 running and 12,500 peak watts on gasoline, or 8,500 running on propane, and it is transfer switch ready through an L14-30R outlet. The 457cc OHV engine, remote key-fob start, and roughly 12-hour run time on a 6.6-gallon tank make it a movable backup you can also take to a job site.
Reasons to buy
- 9500 Running Watts and 12500 Peak Watts (Gasoline); 8500 Running Watts, 11200 Peak Watts (
- Features Two GFCI 120V 5–20R 20A Standard Household Receptacle, One Transfer Switch Ready
- Powered by a Heavy Duty 457cc Westinghouse 4-Stroke OHV Engine Featuring a Long-Lasting Ca
- Plug-and-Play: Comes with a Remote Start Key Fob, 12V Battery Charger, Oil, an Oil Funnel,
- All Westinghouse Portable Generators are Functionally Tested in the Factory and May Contai
Reasons to avoid
- You must start, refuel, and run it outdoors yourself during every outage
- Not automatic, so it will not power up on its own when you are away
Generac 26kW Home Standby Generator
The 26kW Guardian is the largest standby here and targets bigger homes that need refrigeration, heating and cooling, and connectivity to stay on. It adds built-in cellular connectivity for Mobile Link, oil-level sensors, improved cold-start performance, and a sloped roof to shed ice and snow, all under a 5-year limited warranty.
Reasons to buy
- Whole House Protection: Keep your family comfortable and connected during power outages. A
- Lowest Total Cost Of Ownership: Electronic fuel & ignition control optimizes fuel use for
- Remote Monitoring & Control: Built-in Cellular Connectivity allows you to monitor performa
- Superior Reliability: Oil level sensors monitor oil level to help ensure generator readine
- Long Term Assurance: Every Generac Standby Generator comes with a 5-year limited warranty
Reasons to avoid
- Cellular remote monitoring requires a paid Mobile Link premium subscription
- Highest capacity here, so it is the most demanding on your fuel supply
DuroMax XP13000EH 13
The DuroMax XP13000EH delivers 13,000 watts and runs on gasoline or propane, so it can keep an entire home running during a storm. It uses a heavy-duty all-metal frame with no plastic parts, a push-button start, a front fuel selector, and a transfer-switch-ready 50-amp outlet for whole-home hookup.
Reasons to buy
- With 13,000 watts of power, the XP13000EH Dual Fuel generator will keep your whole home ru
- DuroMax is the industry leader in Dual Fuel portable generator technology, with a full ass
- At the core of all our products resides a robust DuroMax engine. Designed for Power. Desig
- The XP13000EH comes with a push button start, a front facing interface that allows you to
- Constructed with a heavy-duty all metal frame and power panel
Reasons to avoid
- Like any portable, it needs manual starting, refueling, and outdoor placement
- The all-metal build makes it heavy to reposition without help
What to look for
Standby vs portable
A standby generator installs permanently, connects to a gas or propane line, and starts automatically through its own transfer switch. A portable costs less and can move around, but you start it, refuel it, and place it outdoors every time.
Sizing to your home
The 10kW Guardian covers essential circuits, while the 22kW and 26kW units handle whole-home loads like central air and a well pump running together. Match the rated wattage to what you actually run at once.
Fuel and refueling
Natural gas removes refueling entirely, propane stores for long periods, and gasoline portables need refills during extended outages. Your fuel choice shapes how hands-off the generator is.
Transfer switch amperage
The included 100-amp and 200-amp automatic switches decide how much of your panel is backed up. Portables typically need a separate manual transfer switch, which is an added cost and install step.
Installation and permits
Standby units require a licensed electrician and often a permit, which adds cost up front. Portables are ready out of the box but still need a proper transfer switch for safe whole-home hookup.
Our verdict
For true whole-house coverage, the Generac Guardian 10kW standby is my top pick. It ships with a 100-amp 16-circuit transfer switch, installs permanently outside, and starts automatically when the grid drops, so essential circuits stay live without you touching anything.
FAQs
It depends on what you run at once. A 10kW standby like the Guardian covers essential circuits, while larger homes running central air plus a well pump lean toward the 22kW or 26kW units. Add up your running loads and confirm the peak wattage covers motor startup surges.
Yes. The Generac standby units here include automatic transfer switches (100-amp or 200-amp) that move your load over on their own. Portable units like the Westinghouse and DuroMax are transfer switch ready but usually require a separate manual switch wired by an electrician.
A large portable like the Westinghouse 12500 or DuroMax XP13000EH can run most home essentials through a transfer switch, but you start and refuel it yourself and place it outdoors. It is a movable, lower-cost alternative to a permanent standby unit.
Natural gas is the most hands-off because it removes refueling, propane stores well for long outages, and gasoline portables are convenient but need manual refills. The Generac standby units run on natural gas or propane, while the portables here offer dual-fuel flexibility.
Yes. The Generac Guardian and 26kW standby units detect an outage and start on their own, transferring power through their built-in switch. Portable generators only run when you are present to start them manually.