Kidde Hardwired Smoke Detector 20SAR 3-Pack with AA Battery Backup — Interconnectable, Fast Smolder Detection

The Kidde 20SAR is a hardwired smoke alarm with AA battery backup that detects smoke faster and links with other alarms to alert an entire home.

Designed for permanent 120V installation with two included AA alkaline backups, the Kidde 20SAR balances professional-grade wiring with the peace of mind of battery redundancy. This three-pack provides code-oriented protection for multiple rooms or floors, combining advanced sensing to reduce nuisance triggers, a loud 85-decibel horn, and interconnect capability so alarms sound together when any unit detects smoke.

How quickly will this alarm detect smoke compared with other models?

The 20SAR uses refined sensing that helps it identify smoldering fires faster than some earlier designs. Internal testing indicates notably quicker response times to smoldering wood scenarios, which may improve early warning in many real-world incidents. It also pairs that sensitivity with logic to avoid frequent nuisance activations.

• Detects smoke reportedly over 25% faster in specific smoldering tests.
• Optimized for smoldering and flaming smoke profiles.
• Red LED visual alert complements the audible 85 dB alarm.

What happens if the house loses power?

When AC power is interrupted, the two AA batteries included with each unit take over automatically so the detector continues monitoring. This battery backup helps preserve continuous operation during outages and ensures the alarm remains functional until mains power returns.

• Connects to standard 120V AC for normal operation.
• Two AA alkaline batteries provide backup power during outages.
• Battery swap and test functions are easy to access for maintenance.

Can multiple alarms be linked so the whole house warns at once?

Yes — the 20SAR supports interconnect capability so that when one alarm senses smoke, all connected Kidde units will sound. This feature is valuable for multi-level homes and larger floorplans where one alarm might otherwise not be heard everywhere.

• Interconnects with compatible Kidde alarms (check model compatibility).
• When one unit triggers, all linked units alarm simultaneously.
• Wiring and connection details are provided in the user guide for installers.

How does this model limit false alarms from cooking or steam?

The 20SAR includes sensing algorithms and hardware tuned to discriminate common non-hazardous aerosols from true smoke signatures. That reduces the frequency of nuisance alarms while maintaining responsiveness to genuine smoke events.

• Advanced sensing reduces triggers from cooking smoke and steam.
• Maintains reliable detection thresholds for hazardous smoke.
• Includes a visible red LED to aid quick visual confirmation of alarm status.

Who is this for: The Kidde 20SAR three-pack is well suited for homeowners replacing existing hardwired systems, landlords and property managers equipping multiple units, and contractors installing code-compliant alarms. If you need dependable hardwired protection with battery redundancy, interconnect capability, and features that limit nuisance alerts, this model offers a practical balance of performance and everyday reliability.