Cummins 20kW QuietConnect Diesel Home Standby Generator — C20D6
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At a glance
- Standby Power
- 20 kW (25 kVA)
- Voltage / Phase
- 120/240V, Single-Phase, 60 Hz
- Rated Amps
- 83.3 A
- Fuel
- Diesel
- Engine
- Heavy-duty 4-cycle industrial diesel, 2200cc, 1800 RPM
- Cooling
- Liquid-cooled
- Sound Level
- 68.4 dBA at 23 ft
- Enclosure
- Sound Level 1, Sandstone aluminum
- Controller
- PowerCommand 1.1 digital controller
- Dimensions (L x W x H)
- 72 x 34 x 45.5 in
- Weight
- 1,091 lbs
- Transfer Switch
- Sold separately (not included on A063P962)
- Warranty
- 2-year limited warranty
Why this generator
- Delivers 20 kW of automatic standby power on 120/240V single-phase service to keep an entire home running through outages
- Industrial-grade liquid-cooled diesel engine built for heavy, sustained loads and long service life
- Quiet operation at just 68.4 dBA from 23 feet inside a Sound Level 1 aluminum enclosure
- PowerCommand 1.1 digital controller provides system monitoring, metering, self-diagnostics and automatic fault shutdown
- Weatherproof Sandstone enclosure rated for extreme conditions, with a cold-weather kit option down to -40F
- Backed by a 2-year limited warranty; UL, CSA, CARB and EPA certified
Everything you need to know
The Cummins C20D6 is a 20 kW diesel standby generator from the Cummins QuietConnect commercial-grade series — a liquid-cooled machine built to carry large homes, estates, and small commercial sites through extended utility outages. With an energy-dense on-site fuel supply, it delivers full rated output and complete fuel autonomy, independent of the utility gas grid.
Automatic, Hands-Off Backup
Paired with a Cummins automatic transfer switch, the C20D6 monitors utility power continuously, starts within seconds of an outage, and transfers the full load automatically — then returns to utility power and shuts down once the grid is restored. No manual switching, no cords, and no downtime for the systems that can't go dark.
Commercial-Grade Power & Control
Cummins PowerCommand control governs the C20D6 with precise voltage and frequency regulation and strong motor-starting capability — critical for hard-starting loads like central air conditioning, well and irrigation pumps, refrigeration, and three-phase equipment. It's the same power pedigree Cummins builds for hospitals, data centers, and critical facilities, scaled for large residential and small commercial use.
Diesel Power & Fuel Autonomy
Diesel makes the C20D6 the right choice where natural gas isn't available, or where you want full control of your own fuel supply. Diesel's energy density delivers strong full-load performance, and an on-site tank keeps you running through extended outages on your own schedule.
Factory-Authorized, Quote-Based Pricing
Total Generator Pros is a factory-authorized Cummins dealer. Because every large-format standby installation is engineered to the site, pricing on the C20D6 is quote-based. Request a free quote and we'll spec the unit, transfer switch, and installation for your project — with free nationwide shipping, turnkey installation across North & South Carolina, and 0% APR financing available on qualifying orders.
- 20 kW standby power
- Cummins QuietConnect series, liquid-cooled
- Diesel fuel
- Cummins PowerCommand digital control
- Automatic whole-building transfer with a Cummins ATS
- Commercial-grade, engineered for large residential and small commercial use
- Model C20D6
Frequently asked questions
What fuel does the C20D6 run on?+
The C20D6 is a diesel-powered standby generator.
Does the price include installation?+
No — the online price covers the unit shipped free to the lower 48. Professional installation is available in NC & SC on a quote basis; outside that area we'll help you find a qualified local installer.
How fast does it ship?+
Free curbside / liftgate shipping to the contiguous 48 states. Made-to-order units typically ship in 12 weeks or less.
What warranty is included?+
5-year limited factory warranty, registered and supported directly through Cummins.
Is financing available?+
Yes — 0% APR financing is available on qualifying orders. Ask us for details before checkout.
Free curbside shipping
Liftgate delivery to the lower 48. Ships in 12 weeks or less (made-to-order commercial unit).
Install help, no upsell
We size, spec, and connect you with a vetted local installer — or talk your contractor through it for free.
Real Cummins warranty
Full 5-year limited warranty — registered and supported through Cummins directly.