The Two Dominant Standby Generator Brands
Generac and Kohler are the two most popular standby generator brands in North America. Together they account for the majority of residential and commercial standby generator installations. Both are excellent products backed by established manufacturers — but they have meaningful differences that matter depending on your application.
Product Range Comparison
Generac offers the widest standby generator lineup of any manufacturer. Their air-cooled residential range covers 7kW to 24kW, while liquid-cooled commercial units extend from 22kW to 150kW+. Generac also manufactures industrial diesel generators and portable generators. GeneratorProDirect carries 79 Generac products.
Kohler offers air-cooled residential generators from 8kW to 20kW and liquid-cooled commercial generators from 24kW to 150kW. Kohler is particularly strong in the commercial and industrial segment, where their generators are widely specified for hospitals, data centers, and critical infrastructure. GeneratorProDirect carries 16 Kohler products.
Warranty Terms
Generac provides a 5-year limited warranty on residential standby generators (parts and labor for the first 2 years, parts only for years 3–5). Commercial units carry a 2-year warranty. Extended warranty options are available up to 10 years.
Kohler offers a 5-year, 2,000-hour warranty on residential standby generators — the 2,000-hour component means the warranty covers actual runtime, not just calendar time. Commercial units carry a 5-year warranty as well, which is notably longer than Generac's commercial warranty.
Engine Technology
Generac manufactures their own engines (G-Force series) specifically designed for generator applications. The advantage is tight integration between engine and generator; the tradeoff is that Generac engines are proprietary and not based on widely available engine platforms.
Kohler uses their own engines in residential units and pairs with established engine manufacturers for larger commercial units. Kohler engines have a strong reputation for longevity in commercial applications.
Monitoring and Smart Home Integration
Generac Mobile Link provides remote monitoring via smartphone app and web portal. It monitors generator status, maintenance schedules, and utility power status. Compatible with smart home integrations. The Wi-Fi module is included with most residential models.
Kohler OnCue Plus offers similar remote monitoring with automatic status updates, maintenance tracking, and power outage notifications. Kohler's system is known for reliability and clean interface design, though historically it has had fewer smart home integrations than Generac.
Noise Levels
Kohler generators are generally quieter than comparable Generac models, particularly in the air-cooled residential range. Kohler's patented sound dampening technology and enclosure design consistently produce lower decibel readings in independent tests. If noise is a concern — for example, in dense residential neighborhoods — Kohler has an edge.
Price Comparison at Key kW Ratings
At comparable kW ratings, Kohler generators typically carry a 10–20% price premium over Generac. For example:
- 14kW air-cooled: Generac ~$4,200 vs Kohler ~$4,800
- 20kW air-cooled: Generac ~$5,500 vs Kohler ~$6,500
- 48kW liquid-cooled: Generac ~$14,000 vs Kohler ~$16,500
Both brands are available tax-free at GeneratorProDirect.com, with free freight on orders over $499.
Parts and Service Availability
Generac has the largest dealer and service network in North America, which means finding a local installer and getting parts is generally easier. Kohler's dealer network is smaller but well-established, particularly in commercial and industrial markets where Kohler has deep relationships with electrical contractors.
Which Brand Should You Choose?
Choose Generac if: You want the widest selection at competitive prices, prioritize easy parts availability, or need a residential whole-home backup generator. Generac's Guardian series is the best-selling residential standby generator line in North America for good reason.
Choose Kohler if: You need commercial or critical power applications, prioritize quieter operation, want a longer commercial warranty, or are specifying a generator for a hospital, data center, or other mission-critical facility. Kohler's engineering heritage in commercial power is unmatched.
Browse Both Brands
Compare Generac and Kohler generators side by side at GeneratorProDirect.com. Both brands ship tax-free in 45+ states with free freight over $499.
