Updated May 2026

Best Whole House Generators

A whole house standby generator starts automatically within 10 seconds of a power outage. These four represent the most trusted options for permanent installation — from entry-level home coverage to full-estate power.

Our #1 pick: Generac 7043 Guardian 22kW View on Amazon → Affiliate link
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#1 — Best Overall

Generac 7043 Guardian 22kW

Price$4,999–$6,499
Output22kW
FuelNatural gas or LP
Transfer Switch200A included
WiFiMobile Link app
Pros
  • ✓ 22kW covers most homes including HVAC, well pump, and appliances
  • ✓ Mobile Link WiFi lets you monitor status from anywhere
  • ✓ 200A transfer switch included — no extra purchase
Cons
  • ✗ Professional installation required — adds $3,000–$5,000 to cost
  • ✗ Annual maintenance required (oil, filters, spark plugs)
View Generac 7043 Guardian 22kW on Amazon →
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#2 — Best for Reliability

Briggs & Stratton 40538 20kW

Price$4,499–$5,499
Output20kW
FuelNatural gas or LP
Transfer Switch200A
EngineVanguard commercial
Pros
  • ✓ Vanguard commercial engine built for 3,000+ hours of use
  • ✓ Symphony II load management prevents generator overload
  • ✓ Weather-resistant aluminum enclosure survives harsh climates
Cons
  • ✗ 20kW slightly under Generac's 22kW ceiling
  • ✗ Less widespread dealer network than Generac
View Briggs & Stratton 40538 20kW on Amazon →
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#3 — Best Premium

Kohler 20RESCL 20kW

Price$5,499–$7,999
Output20kW
FuelNatural gas or LP
Transfer Switch200A
OnCue PlusRemote monitoring included
Pros
  • ✓ OnCue Plus remote monitoring and generator management built-in
  • ✓ Quiet operation — among the quietest in its class
  • ✓ Kohler's reputation for industrial reliability in a home unit
Cons
  • ✗ Most expensive option — premium brand premium price
  • ✗ Requires dealer installation — less DIY-friendly
View Kohler 20RESCL 20kW on Amazon →
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#4 — Best Entry-Level

Champion 100179 12.5kW

Price$2,499–$3,499
Output12.5kW
FuelNatural gas or LP
Transfer Switch100A included
Warranty10-year limited
Pros
  • ✓ Under $3,000 — most affordable whole-house standby option
  • ✓ 10-year limited warranty gives confidence at this price
  • ✓ Powers essential circuits for most homes under 1,500 sq ft
Cons
  • ✗ 12.5kW won't cover HVAC + large appliances simultaneously
  • ✗ 100A transfer switch limits whole-home coverage
View Champion 100179 12.5kW on Amazon →

Quick Comparison

All four whole house generators side by side.

ProductBest ForPriceKey SpecBuy
🥇 Generac 7043 Guardian 22kWBest Overall$4,999–$6,49922kWAmazon →
🔧 Briggs & Stratton 40538 20kWBest for Reliability$4,499–$5,49920kWAmazon →
🏆 Kohler 20RESCL 20kWBest Premium$5,499–$7,99920kWAmazon →
💰 Champion 100179 12.5kWBest Entry-Level$2,499–$3,49912.5kWAmazon →

Ready to Buy?

Our top pick for whole house generators is the Generac 7043 Guardian 22kW.

View Generac 7043 Guardian 22kW on Amazon →

Affiliate link — we may earn a commission at no extra cost to you.