Cummins · model RS13A
Home Standby Generator · NG/LP
~$3,899approx. list price
13,000 W running — sustains the well pump or a small central AC tier and everything below it.
Best forValue-focused buyers near a Cummins dealer who want commercial-grade pedigree and low noise.
The sleeper value in home standby: a genuine Cummins — the company that powers hospitals and data centers — at a price under the equivalent Generac or Kohler. The RS13A's QSJ999G 999cc V-twin was designed in-house for gaseous fuel, and the QuietConnect sound-insulated enclosure holds it to 65 dB at 23 feet. It holds 13kW on either natural gas or propane with no derate and meets the 18-inch NFPA 37 clearance for tight lots. The catch: the Cummins residential dealer network is sparse compared to Generac's. If there's no certified servicer within reasonable distance, warranty work becomes your problem. The Cummins app covers status and alerts but is basic.
From the spec sheet
True Cummins engine heritage·65 dB — among the quietest·No NG derate at 13kW
At a glance
At a glance
Head to head
Home Standby Generator · NG/LP · 65 dB
17,000 W · up to well pump or a small central AC
Best for Homeowners who want a quiet, full-rated 17kW air-cooled unit on natural gas and do not want to pay for a liquid-cooled machine.
Home Standby Generator · NG/LP · 65 dB
20,000 W · up to whole home with central air
Best for Noise-sensitive neighborhoods and HOAs that still need full whole-house starting power.
Home Standby Generator · NG/LP · 69 dB
13,000 W · up to well pump or a small central AC
Best for Owners of mid-size homes with a narrow side yard who want a 7-year warranty that covers labor, and can live with 69 dB.