Last updated: March 2026

20RCA

Power: 20kW LP / 18kW NG
Installed Cost: $11,000–$16,000
Noise: 69 dB (64 dB exercise)
Weight: 555 lbs
Warranty: 5 years
Fuel: Dual-fuel (NG/LP)

Best for: 2,000–3,000 sq ft homes. Premium whole-house pick. Randy's generator.

The 20RCA is Kohler's most popular residential model and the one the founder of this site owns. At 555 lbs, it's the heaviest generator in its class, nearly 90 lbs more than a Generac 22kW. You feel that weight in everything about how this unit is put together.

What This Generator Keeps Running

On propane (20 kW): 3-ton AC with room for the rest of the house. 41 kVA motor starting handles compressor surges with authority.

Limitations: The Generac 22kW produces 22 kW on propane (2 kW more) and 19.5 kW on NG (1.5 kW more). For homes near the sizing limit, those 2 kW matter.

What It Actually Costs

Unit price

$5,699

Installed

$11,000–$16,000

Unit is $420 cheaper than the Generac 22kW. But add Kohler's $789 ATS and the total cost flips slightly. The free 10-year warranty changes the equation.

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How Loud Is It?

64 dB exercise / 69 dB full speed. 1 dB quieter than Generac and Cummins during weekly exercise. During outages, 69 dB is the loudest in class.

How Big Is It?

47" × 26.2" × 32.2". 555 lbs: heaviest in class. That 89-lb gap over Generac is steel and aluminum.

Maintenance

Kohler CH1000 (999cc V-Twin). Annual professional service. $200–$500/yr.

Pros & Cons

What's good

✓Heaviest residential generator at this size: built for 20+ year durability
✓181 mph wind-rated enclosure
✓Quietest exercise mode in class (64 dB)
✓Free 10-year warranty promotion
✓41 kVA motor starting
✓Based on owner reviews, scores 4.4/5 on ConsumerAffairs

What's not

✗69 dB at full speed: loudest in class during actual outages
✗20 kW vs Generac's 22 kW on propane
✗Transfer switch always sold separately
✗18 kW on NG. Generac 22kW delivers 19.5 kW on NG
✗OnCue Plus lost push notification capability
✗Only 3 sizes: no 22kW or 24kW option

Frequently Asked Questions

How does the Kohler 20kW compare to the Generac 22kW?▾

Generac delivers 2 more kW on propane and 1.5 more on NG, with a larger dealer network. Based on owner reviews, Kohler tends to score higher on satisfaction. Kohler also offers quieter exercise and the 10-year warranty promo. Installed costs are close ($11,000–$16,000 vs $12,000–$17,000).

Does the founder really own this generator?▾

Yes. A Kohler 20RCAL, installed for about $12,000 in the South. It's been through multiple outages and works as advertised: when installed correctly. The install took three callbacks.

Is the Kohler 20RCA good on natural gas?▾

18 kW on NG: 10% reduction from propane. Enough for whole-house in most 2,000–2,500 sq ft homes. Tight with a 3-ton AC and heavy kitchen loads. The Generac 22kW gives 19.5 kW on NG.

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