Briggs & Stratton PowerProtect DX 20kW (040657)

Briggs & Stratton PowerProtect DX 20kW (040657) is a home standby generator from Briggs & Stratton, rated 20,000 running watts on propane and 20,000 W on natural gas, measured at 68 dBA, with 120/240V output.

General
Type	home-standby
Fuel	natural-gas, propane

Power output
Running watts (gas / LP for standby)	20000 W
Running watts (propane)	20000 W
Running watts (natural gas)	20000 W

Performance
Noise level	68 dBA

Electrical
Output voltage	120/240V
Automatic transfer switch included	No
Main-line circuit breaker	100 A

Features
Start type	automatic

Engine
Engine	Briggs & Stratton Vanguard
Engine displacement	993 cc

Physical
Weight	520 lb

Warranty
Warranty	10 yr

What the numbers mean

At 20,000 running watts on its best fuel, this unit is sized for whole-house coverage on a typical 200 A home, subject to a load calculation by a licensed electrician.
Runs on natural gas, propane — expect lower output on propane (roughly 10%) and natural gas (roughly 20%) than on gasoline; the spec table shows the published per-fuel ratings.
Permanently installed unit: sizing, gas-line capacity, placement clearances, and the transfer switch are a job for licensed installers under local permits.

Compare the Briggs & Stratton PowerProtect DX 20kW (040657)

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Frequently asked questions

What can the Briggs & Stratton PowerProtect DX 20kW (040657) run during an outage?

With 20,000 running watts on its best fuel, the Briggs & Stratton PowerProtect DX 20kW (040657) is sized for whole-house coverage on a typical 200 A home, subject to a load calculation by a licensed electrician. Add up your actual loads with a sizing worksheet — the bands here are rough guidance, not a load calculation.

Does the Briggs & Stratton PowerProtect DX 20kW (040657) start automatically?

Yes — home standby generators monitor utility power and start themselves when it fails; pairing it with an appropriately sized automatic transfer switch (sold separately for some configurations) completes the automatic changeover.

Sources

energy.briggsandstratton.com (retrieved 2026-07-23)
canadianoffgrid.com (retrieved 2026-07-24)