How much does a Cummins RS25 cost installed?

$17,000–$25,000+ turnkey installed per the dataset's reported range — the unit is $12,500–$17,000 and is highly configuration-dependent (single vs three-phase, ATS sizing, fuel supply). Complex installs quote higher.

How much is the Cummins RS25 unit itself?

About $14,750 — a reported range of $12,500–$17,000, highly config-dependent (dealer/retailer listings, low-confidence aggregate).

How much does the Cummins QuietConnect RS25 Standby Generator cost installed?

Expect roughly $21,000 installed, including the unit, automatic transfer switch, electrical work, gas plumbing, and site prep. Your local quote varies with the length of the gas and electrical runs and any panel upgrades.

Is the Cummins QuietConnect RS25 Standby Generator enough to power a whole house?

Liquid-cooled 25 kW standby generator for larger homes/light commercial; 1800 RPM for extended multi-day runtime. Whole-house coverage depends on your load calculation; a licensed installer will size it against your panel and largest appliances.

What does the Cummins QuietConnect RS25 Standby Generator cost to run?

Running cost depends on fuel and load. On natural gas, expect roughly $20–$60 per day of continuous operation for an air-cooled unit, plus a few dollars a month for weekly self-tests and $200–$500 a year for maintenance.

Cummins QuietConnect RS25 Standby Generator cost & price guide

Updated September 2026

Standby generator installed beside a home

The Cummins QuietConnect RS25 runs about $14,750 for the unit — a reported range of $12,500–$17,000 that is highly configuration-dependent (single- vs three-phase, service options). Turnkey installed runs $17,000–$25,000+. This is the largest air-cooled-class QuietConnect before Cummins's liquid-cooled line, and the honest read is that the wide spread is real: configuration choices move the price more than the model choice does.

What you should expect to pay

MSRP: Not published
Unit (est.): $14,750
Installed (est.): ~$21,000
90-day low: —

Unit-only range reported $12,500-$17,000 (midpoint 14,750), highly config-dependent (single vs 3-phase). Turnkey installed $17,000-$25,000+. Low confidence due to wide config-driven spread.

Confidence: low · Data as of 2026-09-17

MSRP: Not published
Unit (est.): $14,750 (range $12,500–$17,000)
Unit + ATS: config-dependent
Installed (est.): $17,000–$25,000+ turnkey
90-day low: $12,500
Confidence: low (wide config-driven spread) · Data as of 2026-09-17

Cost to install

Installation scope is what drives the RS25's spread: single- versus three-phase service, ATS sizing, the electrical run, gas supply for the larger fuel demand, pad and site work, and permits. The dataset's turnkey band is $17,000–$25,000+ installed, with low confidence flagged because configuration choices move the total more than the unit choice does. Quotes should itemize each line.

Reported prices

$12,500 (low) — Unit only, low end (single-phase).
$21,000 (other) — Turnkey installed midpoint ($17,000-$25,000+).

Observation row cummins-rs25 (typical_street 14,750; sources: Mighty Generators, Norwall, Northern Tool).

Specs

Rated Output Kw: 25
Fuel Options: natural gas, liquid propane
Cooling: liquid-cooled
Rpm: 1800
Noise Db: 64-69
Phases: single-phase, 3-phase

Where to buy

Electric Generators Direct — Specialist retailer, broad air- and liquid-cooled stock
Home Depot — Generac and other air-cooled models, often in stock
Lowe's — Generac and Briggs & Stratton, in-store pickup
Generac (manufacturer) — Find a certified dealer for installed quotes

Frequently asked questions

How much does a Cummins RS25 cost installed?: $17,000–$25,000+ turnkey installed per the dataset's reported range — the unit is $12,500–$17,000 and is highly configuration-dependent (single vs three-phase, ATS sizing, fuel supply). Complex installs quote higher.
How much is the Cummins RS25 unit itself?: About $14,750 — a reported range of $12,500–$17,000, highly config-dependent (dealer/retailer listings, low-confidence aggregate).
How much does the Cummins QuietConnect RS25 Standby Generator cost installed?: Expect roughly $21,000 installed, including the unit, automatic transfer switch, electrical work, gas plumbing, and site prep. Your local quote varies with the length of the gas and electrical runs and any panel upgrades.
Is the Cummins QuietConnect RS25 Standby Generator enough to power a whole house?: Liquid-cooled 25 kW standby generator for larger homes/light commercial; 1800 RPM for extended multi-day runtime. Whole-house coverage depends on your load calculation; a licensed installer will size it against your panel and largest appliances.
What does the Cummins QuietConnect RS25 Standby Generator cost to run?: Running cost depends on fuel and load. On natural gas, expect roughly $20–$60 per day of continuous operation for an air-cooled unit, plus a few dollars a month for weekly self-tests and $200–$500 a year for maintenance.

Related guides

Whole-house standby generator cost — the standby hub: unit and installed cost at a glance, cost drivers, and model-by-model comparisons.
Roof replacement costs — installed cost per square for asphalt, metal, and tile roofs, plus tear-off and pitch.
Roof replacement cost calculator — estimate your own roof by size, material, tear-off layers, pitch, and stories.
Driveway & concrete flatwork costs — asphalt, concrete, and paver pricing per square foot; the same flatwork family as the poured pad your standby unit sits on.

Sources

Norwall PowerSystems - Cummins QuietConnect RS20AC / RS25 (medium reliability)
Mighty Generators - Cummins RS25 25kW 3-phase (medium reliability)
Northern Tool - Cummins commercial standby 25kW RS25 (medium reliability)

About this data

Prices are aggregated from public dealer and retailer listings and are indicative, not quotes. Manufacturers often do not publish MSRP for dealer-installed equipment.

[low] outlier: Very wide price spread ($12,500-$17,000 unit-only) driven by single-phase vs 3-phase and config; treat midpoint as indicative only.
[medium] unverified: 2026-10-01 recheck: Cummins RS25 was re-verified only for the 3-PHASE config (Mighty Generators $17,733.56, +4.3% above the dataset band top $17,000). The dataset LOW $12,500 is single-phase and was NOT re-verified (Northern Tool 403; no live single-phase capture). The config-driven spread remains un-refreshed at the low end.