Best Natural-Gas Standby Generators
Running on the home’s gas meter removes the worst part of generator ownership: fuel logistics. No cans, no stabilizer, no propane deliveries mid-outage. The trade-offs are a roughly 10–20% lower output on natural gas than on propane and a meter/line-capacity check — the gas utility or plumber must confirm your meter can feed the generator plus the furnace and water heater at once.
Sizing target: a home standby unit with a published natural-gas rating. Filtered to home standby units with a published natural-gas rating, ordered by natural-gas running watts. Rankings use published specifications only — no prices or sponsorships.
| Model | Running W (best fuel) | Starting W | Noise | Est. runtime @ 25% | Est. fuel cost/day |
|---|---|---|---|---|---|
| Cummins QuietConnect RS30 30kW Liquid-Cooled | 30,000 | — | 60 dBA | — | $79 (natural gas) |
| Cummins QuietConnect RS25 25kW Liquid-Cooled | 25,000 | — | 64 dBA | — | $67 (natural gas) |
| Briggs & Stratton PowerProtect DX 26kW (040806) | 26,000 | — | 65 dBA | — | $74 (natural gas) |
| Kohler 26RCA 26kW | 26,000 | — | 67 dBA | — | $65 (natural gas) |
| Kohler 26RCAL 26kW with ATS | 26,000 | — | 67 dBA | — | $65 (natural gas) |
| Generac Guardian 26kW (7290) | 26,000 | — | 67 dBA | — | $67 (natural gas) |
| Generac Guardian 26kW with 200A ATS (7291) | 26,000 | — | 67 dBA | — | $67 (natural gas) |
| Generac Guardian 24kW (7209) | 24,000 | — | 67 dBA | — | $73 (natural gas) |
| Generac Guardian 24kW with 200A ATS (7210) | 24,000 | — | 67 dBA | — | $73 (natural gas) |
| Kohler 24RCLA 24kW Liquid-Cooled | 24,000 | — | 61 dBA | — | — |
Runtime at 25% load and daily fuel cost are estimates derived from published spec-sheet figures — the formulas and their limits are on the methodology page. A dash means the manufacturer doesn't publish the underlying number.
Not sure this is your use case? Add up your actual loads with the generator sizing calculator, or start from the sizing guide.
Frequently asked questions
What does this list require of a generator?
Every model shown meets the sizing target: a home standby unit with a published natural-gas rating. Filtered to home standby units with a published natural-gas rating, ordered by natural-gas running watts.
How are these recommendations ranked?
Purely from published manufacturer specifications in the BackupAtlas dataset — no prices, sponsorships, or review scores are involved. Models missing the data a criterion needs are excluded rather than guessed at.
Are the wattage figures guaranteed?
They are the manufacturers' published ratings, and dual-fuel/natural-gas ratings differ by fuel — always size against the rating for the fuel you will actually run, and treat runtime and cost estimates as planning figures, not promises.