Cummins RS25
Liquid-cooled · Natural Gas / LP Vapor
120/240V single phase
$17,622.48
Equipment only. Installation quoted after a free site survey.
View detailsConnect Series Liquid-Cooled
Cummins RS30 — 30kW Standby Generator
30kW liquid-cooled standby generator, Natural Gas / LP Vapor. Large custom homes, or homes with a pool, shop, well and multiple HVAC zones.
Representative manufacturer image of the range. Enclosure finish, color and dimensions vary by model and configuration — see the specifications below for this unit.
30 kW Natural Gas / LP Vapor Liquid-cooled Aluminum
The RS30 is liquid-cooled. That matters above roughly 25kW, where an air-cooled engine can no longer shed heat during the long runs a multi-day outage demands. It is a larger machine - 94 x 34 x 45.5 inches and 1231 lb - and it needs a proper pad and clearance.
It runs on natural gas or LP vapor. On natural gas there is no tank to fill and no runtime limit as long as the utility main holds pressure, which is why it is the default choice on almost every DFW home that already has gas service.
Available in 3 factory configurations: 120/240 1Ph, 120/208 3Ph, 120/240 3Ph. The correct one depends on your incoming service, not on preference - ordering the wrong voltage is the single most expensive mistake on a job like this, so we confirm it against your meter and panel before anything is ordered.
Equipment price
$18,812.69
Equipment only — installation quoted separately
The RS30 is sold by UTS ElectricPros, an authorized Cummins dealer in Dallas–Fort Worth. Buying through an authorized dealer is what keeps the manufacturer warranty valid — equipment bought from an unauthorized reseller frequently is not covered, and owners tend to find that out at the worst possible moment.
Part A051Y401
Match this to your building's existing service. It does not change the generator's output.
A separate service
Want us to install it?
Installation is not included in the price above and is not sold at checkout. It is quoted on its own, in writing, after a free on-site survey. You are welcome to buy the equipment here and use your own electrician.
- ✓ Concrete or composite pad
- ✓ Gas line and pressure test by a licensed plumber
- ✓ Transfer switch and electrical tie-in
- ✓ Permit and city inspection
- ✓ Startup, load test and walkthrough
Prefer to talk it through? Have us call you.
Got it. We will call you. If you would rather not wait, ring (214) 957-4307 and ask for whoever is on generators.
Specifications
| Model | Cummins RS30 |
|---|---|
| Rated output | 30 kW |
| Fuel | Natural Gas / LP Vapor |
| Cooling | Liquid-cooled |
| Enclosure | Aluminum |
| Weight | 1231 lb |
| Dimensions (L×W×H) | 94 x 34 x 45.5 in |
| Voltage configurations | 120/240 1Ph, 120/208 3Ph, 120/240 3Ph |
| Extreme cold package | Available as an upgrade |
| Transfer switch | Sold separately, sized to your service |
| Application | residential |
| Rated amps (NG / LP) | 125 / 125 A at 120/240 V |
| Sound level | 60 dB(A) at 23 ft (7 m) with Sound Level 2 enclosure |
| Cummins model | C30 N6 |
| Displacement | 2.4 liters (143.5 in³) |
| Cylinder block | Cast iron, in-line 4 cylinder |
| Rated speed | 1800 rpm |
| Voltage regulation | ±1.0% no load to full load |
| Frequency regulation | ±0.75% random at 60 Hz |
| Governor class | ISO 8528 Part 1 Class G2 |
| Controller | PowerCommand electronic control |
| Main breaker | 150 A |
| Derating | Full engine power to 2,500 ft at up to 104°F. Above that, derate 4% per 1,000 ft and 2% per 10°C. |
| Fuel | Natural gas and LP output are identical on the liquid-cooled range — there is no natural gas derate. |
| Certifications | UL 2200 |
| Warranty | 2 year standby base warranty. Extended warranty options available. |
| Extended warranty | Cummins factory coverage for 5, 7 or 10 years, from $1,105.56. See every price |
Available configurations
3 factory configurations. We confirm the correct one against your service before anything is ordered.
| Part number | Voltage | Phase | Price |
|---|---|---|---|
| A051Y401 | 120/240 | 1Ph | $18,812.69 |
| A051Y402 | 120/208 | 3Ph | $18,757.76 |
| A051Y405 | 120/240 | 3Ph | $18,691.85 |
All prices are for the equipment only.
Built in
What the RS30 does that the spec table does not show
1800 rpm, not 3600
Liquid-cooled sets turn at half the speed of an air-cooled unit. Fewer revolutions per hour of running means less wear, and it is a large part of why these are quieter despite being far more powerful.
Sound Level 2 enclosure
From 60 dB(A) at 23 feet on the smaller sets. A 30kW liquid-cooled unit is quieter than a 20kW air-cooled one.
PowerCommand control
Electronic governing and voltage regulation, with alarm and status monitoring. Regulation is tighter than the air-cooled range at ±1.0%.
Continuous rated output
A radiator loop means it can hold rated output indefinitely rather than shedding heat into the air. That is the practical difference in a multi-day outage.
Accessories and maintenance parts for this unit →
Specifications on this page are taken from the Cummins published specification sheet for
the air-cooled Connect range.
Download it from Cummins →
Pairs with
Transfer switches for a 30kW set
The switch is sized to your electrical service, not to the generator. These are the families that typically apply at this output — we confirm the exact one at the survey.
Questions about the RS30
How much does a Cummins RS30 cost installed in Dallas-Fort Worth?
The RS30 equipment price is $18,812.69. Installation on a 30kW liquid-cooled unit varies too widely to band honestly - the pad, the fuel supply, the switchgear and the electrical service are all engineered to the specific site. We quote it in writing after a site survey, and we will tell you the drivers before we quote so you can see where the money goes.
What will the RS30 actually run?
True whole-house coverage for a 4,000-6,000 sq ft home with multiple AC systems, no load shedding required. Final confirmation comes from a load calculation against your actual panel, which we do at the survey.
Do I need a transfer switch with the RS30?
Yes. A standby generator cannot be code-compliantly connected without an automatic transfer switch - it is what keeps your generator from backfeeding the utility line and endangering line crews. The switch is sized to your electrical service, not to the generator, so we confirm your service size at the survey before specifying it.
Is the RS30 in stock?
Availability changes weekly. A refundable deposit reserves a specific unit and locks the equipment price for 90 days, which is the practical way to hold one while the survey and permit work happen. If we cannot source it in a reasonable window, you get the deposit back.
Step up or down
Is 30kW the right size?
The next capacity either side in the liquid-cooled range. If you are not sure which way to go, the sizing calculator works it out against your own house rather than its square footage alone.
Down to 25kW — less headroom, lower install cost.
Up to 36kW — room for a second AC or a well pump.
Cummins RS36
Liquid-cooled · Natural Gas / LP Vapor
120/240V single phase
$19,356.52
Equipment only. Installation quoted after a free site survey.
View detailsWant the RS30 priced for your address?
Equipment is $18,812.69. The installation number depends on your property, and the only honest way to get it is to come look. That visit is free.
What it is for
Whole-house backup power, started automatically
The grid goes down and the house stops with it. In Texas that is not an inconvenience for long: in February it is heat and frozen pipes, in August it is air conditioning, and a house without either becomes uninhabitable within hours rather than days.
Why it becomes urgent
Winter storms and the spring severe-weather season take down distribution lines across the Metroplex every year, and summer peak demand on the ERCOT grid has repeatedly produced conservation appeals.
Who buys it
Homeowners who cannot simply leave — small children, someone on medical equipment, a well pump, a home office, or livestock on the property.
The RS30 is installed across the Dallas–Fort Worth Metroplex by our own licensed crews — the cities we serve, what installation involves, and a free on-site survey before any number is put in writing.
Before you buy the RS30
The questions that decide whether this is the right machine, answered properly rather than in a sentence on a product page.
- Will 30kW actually cover my house?Work it out against your own square footage, air conditioning and well pump before you buy.
- Will it run my air conditioner?Two compressors starting on a Texas afternoon is the load that decides the answer.
- Can my HOA stop me installing it?Texas Property Code § 202.019 says no. What they can still ask for.
- Will my gas line carry it?The most common reason a quote moves after the survey. Real BTU demand and the pressure it needs under load.
- What can my city require?Less than it used to, and a third party can now do the inspection.
All the generator guides we have written
Every Cummins liquid-cooled standby, 25kW to 150kW · Or a portable, if you only need a few circuits
Installed across Dallas–Fort Worth
The RS30 ships anywhere in the country. Installation is Dallas–Fort Worth only, carried out by our own licensed crews under TECL #40628 operating from Grand Prairie — because a generator is quoted against your gas meter, your panel and your city, which nobody can do from a warehouse. What installation actually involves.
- Generator installation in Fort WorthOncor Electric Delivery for most addresses, with CoServ Electric, Tri-County Electric Cooperative and United Cooperative Services in parts of the city
- Generator installation in DallasOncor Electric Delivery
- Generator installation in ArlingtonOncor Electric Delivery
- Generator installation in McKinneyOncor, CoServ Electric or Grayson-Collin Electric Cooperative, depending on the address
All 27 cities we install in → · every install includes the permit, the inspection and meeting the inspector on site, and the number comes from a free on-site survey rather than a price list.
After the RS30 is in
A generator is a fifteen-year relationship, not a transaction. What that looks like from here.
Maintenance and service plans
Skipped maintenance is the top cause of an outage-night no-start. What a visit covers and how often it is due.
The battery, specifically
The component that fails most often when maintenance is skipped, and why the weekly exercise does not prove it is healthy.
Cummins warranty, and ours
What the manufacturer covers, what the installer covers, and which one you call when something fails.
Financing it
Monthly payments through Affirm, or fold it into a home loan at purchase or refinance.
Parts and accessories
Cold-weather kits, maintenance parts and the part numbers that fit this unit.