Kohler · RCA Series (Residential Air-Cooled)

Kohler 26RCA

26 kW standby · Natural Gas / LPG · Air-cooled

26 kW residential air-cooled standby generator. The largest air-cooled unit in Kohler's residential lineup for larger homes on a budget.

Kohler Kohler 26RCA generator — specifications and details
Standby power
26 kW
Voltage options
120/240V
Frequency / Phase
60 Hz · 1-phase
Engine
Kohler CH1006 · 1L
residential-largewhole-housedual-hvac-budget
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Overview#

The Kohler 26RCA is a 26-kilowatt residential air-cooled standby generator and the largest air-cooled unit in Kohler's (Rehlko's) current residential lineup. Per spec sheet G4-315, it uses the Kohler CH1006 999 cc V-twin at 3,600 RPM, 120/240 V single phase, multi-fuel (NG/LP), in an aluminum sound enclosure.

The air-cooled size point#

At 26 kW sustained output with air cooling, the engine is working harder than the 14- and 20-kW siblings, and ambient-temperature derate becomes more relevant. For installs in inland areas with hot summers, a liquid-cooled platform (RCL) at comparable kW is generally a better long-term choice.

Service intervals#

Per Kohler's RCA owner manual, with Kohler PRO 10W-50 oil and the PRO extended-life filter, oil and filter changes are on a 300-hour / 2-year interval. Without the PRO oil/filter, the manual specifies 100 hours / yearly oil and 200 hours / yearly filter. We default to the PRO regimen.

Our service experience#

We install the 26RCA where the customer needs the larger air-cooled output but the site is mild enough — typically coastal Monterey Peninsula and Santa Cruz County. Inland installs of this kW band trend toward liquid-cooled.

Engineering specifications

Physical

Length
47 in
Width
26.2 in
Height
32.3 in
Dry weight
670 lb

Acoustic

Sound @ 7m, full load
67 dBA
Enclosure
Sound-attenuated

Fuel system & runtime

BTU/hr @ full load
290,000

Documents & downloads

Spec sheets & manuals

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Configure your Kohler 26RCA

Lock the enclosure, fuel system, transfer switch, and add-ons — we'll confirm pricing, availability, and lead time within one business day. Prefer a free-form quote? That option is still here.

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Estimate runtime for the Kohler 26RCA

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

Estimate runtime on this tank

Fuel demand at 75% load

273,000 BTU/hr≈ 273.0 cf/min @ 1,000 BTU/cf

On utility natural gas the runtime is generally unlimited provided the supply line and meter can deliver this BTU/hr at the engine's required inlet pressure (typically 5–14" WC residential, up to 5 psi commercial). Confirm against the OEM's published fuel-pressure spec.

Service intervals

Manufacturer-recommended intervals for the Kohler 26RCA under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter
Every 200 hours or 24 months
Load bank test
Every 12 months

Common failure modes

What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.

ComponentSymptomTypical hoursSeverity
BatteryFailed to start during outage—minor
Spark plugsHard starting, rough idle—minor
Cooling systemOvertemp under sustained full load, especially summer—moderate

Frequently Asked Questions

What engine is in the 26RCA?
Per Kohler's G4-315 spec sheet, the 26RCA uses a Kohler CH1006 V-twin air-cooled engine (999 cc, 10.5:1 compression, 3,600 RPM). Maximum engine output is listed at 26.1 kW on LP and 24.5 kW on natural gas; the genset's electrical rating is 26 kW standby.
Is the 26RCA the largest Kohler air-cooled residential generator?
As of the current Kohler/Rehlko residential catalog, yes — the 26RCA is the top of the air-cooled RCA family. Larger residential units shift to the liquid-cooled RCL platform.
Why does air-cooled top out around this size?
Air cooling relies on fins and a fan to shed heat. As engine output rises, dissipating heat under sustained full-load operation in warm ambient becomes the limiting factor; liquid cooling (radiator + coolant) handles that more effectively at higher kW.

Compatible equipment

Transfer switches

More in the RCA Series (Residential Air-Cooled)

Kohler RCA Series: 14–26 kW air-cooled residential standby — entry-point whole-house backup on natural gas or LP.

View all 3models in this series →

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