The whole-home heavyweight bout. On paper they're near-twins: whole-house coverage, 200A automatic switch, natural gas or propane, remote monitoring. Champion's edges are the 10-year warranty (double Generac's) and a quieter 67 dBA; Generac's edge is the largest installer, parts, and service network in existence. Our tiebreaker is boring but decisive: whichever brand has a certified standby installer closer to your house wins.

Pick the Champion if…

✓A Champion-certified installer serves your area (verify first)
✓The 10-year warranty matters for a 15-year asset
✓Marginally quieter operation near patios/bedrooms

Pick the Generac if…

✓Installer and service density near you favors Generac (it usually does)
✓Mobile Link monitoring maturity and parts-everywhere confidence
✓Slightly more peak capacity for load-heavy homes

Spec by spec

Spec	Champion 22kW aXis (with 200A ATS)	Generac Guardian 24kW (with 200A ATS)
Our score	8.6 / 10	9.2 / 10
Rated power	22kW (LP) / 19.8kW (NG)	24kW (LP) / 21kW (NG)
Fuel	Natural gas or propane	Natural gas or propane
Engine	999cc Champion V-twin	999cc G-Force V-twin
Transfer switch	200A whole-house ATS included	200A ATS (pair; often bundled)
Noise	~67 dBA	~67 dBA @ 23 ft
Cold start	Rated to −22°F	—
Self-test	Weekly Quiet Test	Weekly, quiet mode
Warranty	10-year limited + lifetime tech support	5-year limited
Monitoring	—	Mobile Link WiFi

Still deciding?

Read the full reviews for the complete story, or check both current prices — sale pricing swings this class of decision all the time.

~$6,995 typical price

Buy on Amazon

~$6,875 typical price

Buy on Amazon