Kohler vs Cummins Generators

Last updated: March 2026

If you've already decided Generac isn't for you, the conversation usually lands here. Kohler is the heavy-duty builder. Cummins is the quiet engineer. Smaller lineups than Generac, smaller dealer networks, and a buyer base that does more research before buying.

Choose Kohler if...

Choose Kohler if you want the heaviest construction, the option to go up to 26kW, and the current free 10-year warranty promotion.

Choose Cummins if...

Choose Cummins if noise is your top priority (65 dB at full load vs 69), you want built-in load management, or you need the most compact unit for tight spaces.

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Head to Head

Spec	Kohler 20RCA	Cummins RS20A
Power (LP/NG)	20 / 18 kW	20 / 18 kW
Unit price	$5,699	$5,804
Installed cost	$11,000–$16,000	$11,000–$16,000
Noise (exercise/full)	64 / 69 dB	65 / 65 dB
Weight	555 lbs	531 lbs
Load management	Add-on	Built-in
Max residential size	26 kW	20 kW

Noise

For weekly exercise, nearly tied (Kohler 64 dB vs Cummins 65). During a multi-day storm at full load, Cummins is 4 dB quieter (65 vs 69). Four decibels is clearly audible.

Build

Kohler at 555 lbs vs Cummins at 531. Kohler's 181 mph wind-rated enclosure is tested, not theoretical. Both are substantial: neither is moving in a hurricane.

Size Range

Kohler reaches 26kW. Cummins caps at 20kW. If you need more than 20kW and want a premium brand, Kohler is your option between these two.

Frequently Asked Questions

Is Kohler or Cummins better?▾

At 20kW they're priced within $100 of each other, so it's not a budget decision. Kohler: heavier build, path to 26kW, 10-year warranty promo. Cummins: quieter at full load, load management included, most compact, -40°F option.

Which is quieter?▾

During weekly exercise: nearly tied (Kohler 64 vs Cummins 65). During outages at full load: Cummins at 65 dB vs Kohler at 69 dB: significant gap for multi-day operation.

Does Cummins make generators bigger than 20kW?▾

Not in air-cooled residential. The QuietConnect series caps at 20kW. Above that, Cummins offers liquid-cooled commercial units at much higher price points.

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Sources & Citations

Claim / Statistic	Source
Kohler owner reviews (4.4/5 from 300+ reviews)	consumeraffairs.com(accessed 2025-03)
Kohler Power rebranded to Rehlko (Sept 2024)	rehlko.com(accessed 2025-03)
Cummins QuietConnect specifications	cummins.com(accessed 2025-03)
PissedConsumer generator brand reviews	pissedconsumer.com(accessed 2025-03)
ConsumerAffairs generator reviews	consumeraffairs.com(accessed 2025-03)
U.S. Energy Information Administration (fuel costs)	eia.gov(accessed 2025-03)

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