Every Cummins standby generator model

Which range am I looking at?

The range decides the footprint, the sound level, the warranty and roughly the price.

Air-cooled, 13kW to 20kW. One enclosure size across all three. Runs at 3600 rpm. Five year / 2,000 hour limited warranty. This is the range most homes are sized into.

Liquid-cooled RS-series, 25kW to 150kW. Turns at 1800 rpm instead of 3600. The RS30 is published at 60 dB(A) at 23 feet in its Sound Level 2 enclosure, against 65 dB(A) for the air-cooled units. 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, per the Cummins spec sheet. Compare quotes on the natural gas figure if that is your fuel. 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.

Configurations up to 100kW are priced on each model page; larger sets are quoted. Cummins builds the set to the voltage ordered, so we confirm your service voltage first. 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.