Protecting the Purchase
Standby Generator Warranties, Explained
A generator warranty is only as good as how you buy and maintain the unit. Here is the fine print worth reading before you sign — what the standard 5-year coverage really includes, the year it quietly stops covering labor, what voids it, and when an extended plan is actually worth the money.
The standard: 5 years or 2,000 hours
Both Generac and Kohler cover a new air-cooled home standby generator for 5 years or 2,000 hours of run time, whichever comes first — a limited warranty against defects in materials and workmanship. For a home unit that mostly runs a weekly exercise cycle plus occasional outages, the 5-year calendar limit is what you’ll hit long before 2,000 hours. The detail most buyers miss is what is covered in each of those five years.
The coverage taper — the labor clock runs out first
A 5-year warranty is not five years of the same coverage. Here is how Generac’s documented terms step down. (Kohler advertises the same 5-year / 2,000-hour length, but its exact labor term is a disclosed unknown — see the note below the table.)
| Period | What’s covered |
|---|---|
| Years 1–2 | Parts, labor, and limited travel on covered defects. |
| Year 3 | Parts only — labor is now on you. |
| Years 4–5 | Major parts only — the engine (short block) and alternator (rotor and stator). |
Why this is the number that matters
Labor is the expensive part of a repair. Because the standard warranty stops covering labor after year two, a repair in year four — even one where the part is covered — can still leave you paying a technician. That single fact is what makes the extended-warranty question worth taking seriously.
Kohler — an unresolved labor term
Kohler advertises the same 5-year / 2,000-hour length. Its current materials describe parts, labor, and travel for the full period, but an older warranty form limited labor to the first two years — and Kohler doesn’t publish its controlling legal warranty document, so we can’t resolve which governs. If labor coverage matters to you, get the current labor term in writing before you sign. Full context is in the Generac vs. Kohler comparison.
Coverage taper and the 5-year / 2,000-hour term: Generac 5-Year Limited Warranty document (generac.com). Kohler’s labor term is a disclosed unknown — Kohler does not publish its controlling warranty document; confirm it in writing.
What’s covered — and what isn’t
Covered
- ✓Defects in material and workmanship on the generator and its components, per the year-by-year taper.
- ✓Major engine and alternator parts through year five.
- ✓Whatever your extended plan adds, if you buy one (often labor + travel — see below).
Not covered
- ✕Routine maintenance — oil, filters, spark plugs, adjustments — and the parts they use.
- ✕Installation and the initial start-up/commissioning charges.
- ✕Wear and consumable items.
- ✕Damage from improper installation, skipped maintenance, non-genuine parts, or unauthorized repair.
- ✕Portable or non-permanently-mounted units — coverage applies to permanently wired, mounted generators.
Exclusions (routine maintenance, install/start-up costs, permanently-mounted-units-only) are from the Generac 5-Year Limited Warranty document.
How to keep your warranty valid
- 1Register the unit and keep your proof of purchase.
- 2Have an authorized dealer perform the start-up — coverage begins on successful activation, not on delivery.
- 3Use a licensed, authorized installer, and have warranty service done by an authorized servicer.
- 4Keep documented maintenance records — Generac states oil service per the manual is required "to maintain product warranty."
- 5Use genuine parts and avoid unauthorized repairs.
Two of these are really buying decisions: coverage begins at the authorized start-up, and it is kept alive by documented maintenance. That’s why “are you an authorized dealer?” is on our installer-vetting checklist, and why the maintenance schedule matters beyond just reliability.
Is an extended warranty worth it?
Both brands sell extensions, purchased within the original 5-year window: Generac offers extensions (historically up to 7 years; specific promotions change, so confirm the current offer), and Kohler offers up to 10 years of coverage — parts, labor, and dealer travel — through certified dealers.
The way to judge one is simple: does it include labor? Since the standard warranty drops labor after year two, an extended plan that carries labor and travel forward is covering the exact cost you’d otherwise eat on a later repair. A parts-only extension is far weaker. If you plan to keep the generator for its full 15–25-year life, labor-inclusive extended coverage is the version worth pricing.
Extended terms: Generac support materials (a Mobile Link 5-year extension promotion ended Dec 31, 2025); Kohler/Rehlko 10-year extended coverage through certified dealers.
One thing to check before you buy a Generac
Active class action — check your serial number
There is an active class action alleging an alternator defect in certain Generac 22kW and 24kW units from the 2021–2024 production window. It doesn’t mean every unit is affected, but if you’re buying one of those sizes, check your serial number against the class definition at classaction.org before you sign. We cover the full context in the Generac vs. Kohler comparison.
Active class action re: Generac 22/24kW alternator (2021–2024) — topclassactions.com / classaction.org and the federal court filing.
Buy it so the warranty holds
The warranty starts at an authorized start-up and stays alive with documented service — which means the installer you choose matters. Tell us about your home and we’ll connect you with an established local installer who does it by the book.
City guides with local installer and permit detail: Naperville, Aurora, Wheaton, Downers Grove, Oak Brook.