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Cummins RS25 25kW Standby Generator Dual Fuel Propane Natural Gas Liquid Cooled 3 Phase 120/208V CARB A051Y399 New

CumminsModel A051Y399

Cummins RS25 25kW Standby Generator Dual Fuel Propane Natural Gas Liquid Cooled 3 Phase 120/208V CARB

  • Peak25 kW
  • Running20 kW
  • FuelNG / LP
  • StartAutomatic
Black Friday price
$11,169.00

Black Friday price ends in —

In stock Ships within 24 hours

Free delivery Thu, Nov 5 – Tue, Nov 10 if you order today, by Expedited LTL freight to your curb or driveway.

Other versions of this model

This one$11,169.00240V$11,339.00A051Y400 · 240V$11,249.00
  • Free shipping48 states + DC
  • 30-day returnsReturn shipping on us
  • Full warrantyBrand-new, from the maker
  • Secure checkoutEncrypted by Stripe
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Questions before you buy? Our small team in Wilmington, NC answers every message personally. Email [email protected]

The Cummins QuietConnect RS25 is a 25kW liquid-cooled standby generator designed for 120/208V three-phase applications.

Running watts
20,000 W
Starting watts
25,000 W
Fuel
Natural gas or propane
Start
Automatic
SKU: A051Y399
Category: , , ,

The Cummins QuietConnect RS25 is a 25kW liquid-cooled standby generator designed for 120/208V three-phase applications. It runs on natural gas or propane with field-selectable fuel configuration at installation and uses a 2.4-liter inline 4-cylinder engine operating at 1800 RPM. The aluminum sound-attenuated enclosure helps keep operation quiet while providing corrosion resistance and service access through removable doors. PowerCommand 1.1 controls deliver integrated diagnostics, voltage and frequency regulation, remote start/stop capability, and automatic fault shutdown. This model is built for demanding environments, including cold-weather starts down to -40°F.

Full specifications

BrandCummins
ModelA051Y399
Running watts20,000 W
Starting watts25,000 W
FuelNatural gas or propane
StartAutomatic
How it shipsExpedited LTL freightTo your curb or driveway, free
Order today, deliveredThu, Nov 5 – Tue, Nov 10Leaves our warehouse within 24 hours

It travels on a pallet. The carrier calls ahead to book a delivery window; please have help on hand to move it.

  1. Answer the carrier’s call to book your delivery window.
  2. Keep a clear, level spot on your driveway or at the curb for unloading.
  3. Have help on hand. Freight drivers don’t carry items onto your property.
  4. Inspect before you sign and photograph any damage. Tell us within 48 hours.

We ship to the 48 contiguous states and Washington, DC. Shipping details · 30-day free returns

Brand-new, with the full manufacturer’s warranty. The terms are set by Cummins and included in the box. If something goes wrong, contact us first: we confirm the next steps within 2 business days and help you file the claim.

Home standby checklist
  • Installation is not included. Use a licensed electrician and, for the gas line, a licensed gas contractor, with local permits.
  • Register the unit with the manufacturer after installation; some brands shorten the warranty if you don’t.
  • Keep the paperwork: order confirmation, installer’s invoice and permit sign-off.
  • Follow the maintenance schedule in the owner’s manual.

How warranty claims work

What it can run

20,000 W running, 25,000 W starting

Pick what you want to power at the same time.

Typical wattages – check the label on your own appliances. Where only one figure is published, running watts are estimated at 80% of the starting figure. Connect to house circuits only through a transfer switch or interlock fitted by a licensed electrician.

Compare similar generators

Same power class, side by side.

SpecificationCummins RS25 25kW Standby Generator Dual Fuel Propane Natural Gas Liquid Cooled 3 Phase 120/208V CARBThis generator$11,169.00Generac Protector 25kW RG02515ANAX Liquid Cooled 1 Phase 120/240V LP/NG Standby Generator$8,899.00Kohler 26RCAL-200SELS Standby Generator 26KW 120/240V Single Phase 200A Automatic Transfer Switch and App Connect$5,549.00
Running watts20,000 W20,000 W20,800 W
Starting watts25,000 W25,000 W26,000 W
FuelNatural gas or propaneNatural gas or propane—
StartAutomaticAutomaticAutomatic
LinkYou are hereView →View →

Questions and answers

Answered by our team in Wilmington. Can’t find yours? Ask below.

Can I connect this generator to my house?
Only through a transfer switch or an interlock kit installed by a licensed electrician. Never plug a generator into a wall outlet: it can back-feed the utility line and endanger line workers. Connecting safely.
What can it run at the same time?
Use the What it can run planner above: tick your appliances and it checks both the running load and the start-up surge against this generator.
Does it ship with oil?
It depends on the manufacturer. If oil is included it is listed under What’s in the box; otherwise use the grade given in the owner’s manual before the first start.
Can I use it in the rain?
Not uncovered. Run it on a dry surface under an open, canopy-like cover, at least 20 feet from doors, windows and vents, and never in a garage.
Is installation included?
No. A home standby generator needs a licensed electrician, a licensed gas contractor for the fuel line and local permits. Delivery to your curb or driveway is free.
How will it be delivered?
Free, by Expedited LTL freight to your curb or driveway, usually within 2–5 business days after it ships. It travels on a pallet. The carrier calls ahead to book a delivery window; please have help on hand to move it.
What if it arrives damaged?
Photograph it and email us within 48 hours of delivery. We replace or refund damaged items at no cost to you.
Ask a questionWe reply personally by email.

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