Generac vs Kohler standby generators
These are the two badges on most residential standby quotes, and their model names suggest a simple tie, a 14 is a 14, a 26 is a 26. The spec sheets say otherwise. This comparison uses the nine Generac and Kohler standby models in our model database: output on each fuel, fuel burn at 50% load, noise, and typical street price. It deliberately does not score reliability or warranty handling. We have no field-failure dataset, and neither brand's marketing is a substitute for one.
The short version
- On natural gas, the nameplate lies in different directions. Generac's 14 kW holds its full 14 kW on NG in our dataset; Kohler's 14RCA drops to 12. At the top, Kohler's 26RCA delivers 24 kW on NG against the Generac 26's 22.5. Neither brand "wins" derating. It flips by size.
- Generac has the broader ladder. We track six Generac standby sizes (10–26 kW) against three Kohler sizes (14, 20, 26), including a 10 kW essentials-class step Kohler doesn't match in our data.
- Fuel burn splits by fuel. Kohler posts the lower natural-gas burn at 14 and 26 kW; Generac posts the lower propane burn at 26 kW. Over a multi-day outage, these gaps are real money.
- Street prices are close and occasionally backwards. The spread inside a size class is a few hundred dollars either way, small next to installation, which our cost guide puts at roughly two-thirds of a typical project.
The lineups, side by side
| Model | Output NG / LP (kW) | Noise (dB) | Street price | NG burn @50% (cu ft/hr) | LP burn @50% (gal/hr) |
|---|---|---|---|---|---|
| Generac Guardian 10 kW (7171) | 9 / 10 | 61 | $3,579 | 101 | 0.97 |
| Generac Guardian 14 kW (7223) | 14 / 14 | 65 | $5,429 | 195 | 1.81 |
| Generac Guardian 18 kW (7226) | 17 / 18 | 65 | $5,279 | 169 | 1.70 |
| Generac Guardian 22 kW (7042) | 19.5 / 22 | 67 | $6,119 | 228 | 2.53 |
| Generac Guardian 24 kW (7209) | 21 / 24 | 67 | $6,429 | 203 | 2.53 |
| Generac Guardian 26 kW (7291) | 22.5 / 26 | 68 | $7,749 | 188 | 2.06 |
| Kohler 14RCA | 12 / 14 | 69 | $4,999 | 124 | 1.65 |
| Kohler 20RCA | 18 / 20 | 69 | $5,699 | 161 | 2.25 |
| Kohler 26RCA | 24 / 26 | 67 | $7,399 | 180 | 2.34 |
Read the price column with care: these are equipment street prices, and street prices don't always climb with size: the Generac 18 lists below the Generac 14 in our October snapshot, because bundles and retailer pricing move independently of the badge. Noise figures are manufacturer ratings; brands don't all test identically, so treat a 1–2 dB gap as a tie and a 4 dB gap as meaningful.
Natural gas changes the answer
Both lineups are sold on their propane (LP) number and derate on natural gas, but by different amounts at different sizes. Generac's derate grows with the model: the 14 holds 14 kW on NG, the 22 gives back 2.5 kW (19.5), and the 26 gives back 3.5 (22.5). Kohler's is flatter: the 14RCA and 20RCA each give back 2 kW (12 and 18), and the 26RCA gives back 2 (24).
What that means at the quote table: if your load calculation says you need a true 20 kW on natural gas, the Generac 22 (19.5 on NG) is a near-miss, not a match. The Generac 24 (21) or the Kohler 26RCA (24) is the honest step. Conversely, at the 14 kW class on NG, the Generac delivers 2 kW more than the Kohler for similar money. Our sizing calculator matches models on the fuel you'll actually burn for exactly this reason, and the model database can highlight everything that covers a 20 kW natural-gas load.
Fuel burn: the cost after the cost
At 14 kW, the Kohler is the thriftier unit on both fuels in our data, 124 vs 195 cu ft/hr on natural gas, 1.65 vs 1.81 gal/hr on propane. At 26 kW the picture splits: the Kohler burns slightly less natural gas (180 vs 188 cu ft/hr) while the Generac burns noticeably less propane (2.06 vs 2.34 gal/hr). One caution before converting these into running costs: a "50% load" rating means half of each unit's own capacity, so the two machines in a row weren't necessarily doing identical work. For tank-runtime and cost-per-day math on matched sizes, see the fuel & runtime guide.
Which fits which buyer
- Essentials-only backup (refrigerator, furnace blower, well pump, lights): Generac's 10 kW step exists in our lineup and Kohler's doesn't; at $3,579 with the lowest burn and noise in this table (0.97 gal/hr LP, 61 dB), it's the natural starting point. Run the calculator first. Many essentials lists still land at 14.
- A true 14 kW on natural gas: the Generac Guardian 14, because it's the one that actually delivers 14 on NG. The Kohler 14RCA is cheaper and thriftier but is a 12 kW machine on gas.
- Whole-home on natural gas at the top end: the Kohler 26RCA's 24 kW NG rating is the strongest in this comparison, with the lowest top-end NG burn. Budget the installed total from the cost guide, not the $7,399 equipment price.
- Whole-home on propane, long outages: the Generac 26's 2.06 gal/hr half-load burn stretches a tank furthest at this size; the fuel guide's runtime table shows what that means in days.
- Noise-sensitive lots: Generac's smaller units (61–65 dB) rate well below Kohler's 14 and 20 (69 dB) in manufacturer figures; at 26 kW they're effectively tied (68 vs 67). Placement and local setback rules will matter as much as the rating.
What this comparison can't settle: which local dealer will answer the phone in year six, and what each brand's warranty paperwork says for the exact SKU you buy. Those are quote-stage questions. Get them in writing from at least two installers, and compare the same fuel rating, the same transfer-switch strategy, and the same load-management assumptions across bids. This page is buying guidance from published specifications, not a substitute for that quote process.
Sources & notes
- All output, consumption, noise, and price figures are from the TallyGauge generator model database (24 models compiled from manufacturer specification sheets and retailer listings, October 2026, US$ street prices). Individual model entries there link to their underlying spec sources.
- Fuel-burn context, tank runtime, and cost-per-day conversions: fuel & runtime guide. Installed-price context: cost guide.
- Street prices move with retailer promotions and bundle contents (some SKUs include a transfer switch); confirm what's in the box before comparing quotes.