Smoke & CO Alarms: warranties compared
4 brands. We read every warranty so you don't have to. Checked through October 2026.
2 of 4 brands cover smoke & CO alarms in full for one year or less. The longest full coverage is 10 years, from First Alert. 2 brands keep some parts covered after full coverage ends.
Every brand, side by side
- 1First Alert65/100Full: 10 yearsNo partial coverage
- 2X-Sense65/100Full: 5 yearsNo partial coverage
- 3Kidde35/100Full: NonePartial: to 10 yearsPartial covers: Smoke, combo and CO alarms; CO + explosive gas alarm (COPDLG)
- 4Onelink23/100Full: NonePartial: to 5 yearsPartial covers: Whole alarm (excluding batteries)Check your model's manual
From each maker's published warranty. “Unverified” means we couldn't confirm the terms on the maker's own site. How we rate warranties
What these warranties often leave out
- Normal wear and tear3 of 4 brands
- Accidental breaks and misuse2 of 4 brands
- Water damage2 of 4 brands
- Batteries1 of 4 brands
How long stores give you to return it
Longest return window first, for smoke & CO alarms.
- CostcoMost itemsNo fixed deadline
- Lowe'sMost items90 days
- The Home DepotMost items90 days
- WalmartMost items90 days
- Ace HardwareMost items30 days
- Do it BestMost items30 days
Show all 7 stores
- Best BuyMost items15 days from delivery
From each store's published return policy, using its rule for smoke & CO alarms where it has one. Member and holiday extensions aren't counted. Check yours before you buy.
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Questions shoppers ask
Which brand of smoke & CO alarms has the best warranty?
On paper, First Alert scores highest, with 10 years of full coverage.
Is a long warranty on smoke & CO alarms really that long?
Often not for the whole product. Many longer warranties cover only certain parts after the first year or two, and you usually pay for the labor. The bars above show full and partial coverage separately.
Do I need to register to get the warranty?
None of the 4 brands require registration for their basic coverage. Registering can still get you recall notices. Keep your receipt either way.
Forward the receipt and I-BUY.AI tracks the return window and warranty for you.