Every Cummins standby generator model

Which range am I looking at?

The lineup splits into three groups, and the split is not arbitrary — it decides the footprint, the noise, the warranty and roughly the price.

Air-cooled, 13kW to 20kW. One enclosure size across all three. Runs at 3600 rpm. Five year limited warranty. This is the residential range, and for most Dallas–Fort Worth homes the 20kW is the answer.

Liquid-cooled RS-series, 25kW to 150kW. Turns at 1800 rpm instead of 3600, which is most of why a 30kW liquid-cooled set is quieter than a 20kW air-cooled one despite making half again as much power. Two year base warranty. Available single or three phase.

Diesel, 20kW to 200kW. For sites with no gas supply, or where a run-time guarantee has to be independent of the utility. Needs a tank and a fuel plan. The fuel comparison covers when that is worth it.

Air-cooled QuietConnect: 13kW to 20kW

Every unit in this group shares the same 34.1 x 36 x 27.3 inch enclosure, the same 999cc V-twin engine, the same 65 dB(A) at 23 feet, and a five year / 2,000 hour limited warranty. The only thing that changes across the three is output.

Cummins air-cooled standby range. Single phase, natural gas or propane, field selectable.

The 20kW units are rated 20kW on propane and 18kW on natural gas. That derate is real, it is published, and it is the single most common thing a competing quote leaves out. Size it against your actual air conditioning load rather than against square footage.

Liquid-cooled RS-series: 25kW to 150kW

These are for large homes with several air conditioning systems, properties with a well and a shop, and small commercial buildings. There is no natural gas derate anywhere in this range — the nameplate rating is what you get on either fuel. Two year standby base warranty, with extended terms available.

Cummins RS-series liquid-cooled. Natural gas or propane, single or three phase.

Three-phase sets are configured to your service voltage, so we quote them against the site rather than selling them off a shelf. Commercial and light-industrial work is here.

Diesel: 20kW to 200kW

Diesel makes sense when there is no gas main to tie into, when the run-time guarantee has to survive a gas interruption as well as an electrical one, or when code requires on-site fuel. The trade is a tank, a fuel contract and a fuel-polishing habit.

Cummins diesel standby range. Tank variants are taller overall than the base set.

Where these numbers come from

Ratings, dimensions and voltage configurations on this page come from the Cummins model bulletin and the per-model specification sheets, cross-checked against the dealer price sheet we quote from. Where a sub-base fuel tank changes the overall height, the figure shown is the installed height including the tank, not the base set alone.

Prices are published on every model page. What a page cannot tell you is what your property needs — that comes from the gas meter, the panel, the distance between them and the air conditioning load. Here is how installed cost actually breaks down.