Affordable smart hardwired fire safety with user-serviceable battery backup. The Kidde 20SAR-WCA is a 120V AC hardwired smart smoke alarm equipped with 2.4 GHz Wi-Fi connectivity, vocal warnings, and dual AA battery backup. Designed to connect with the Kidde app, it sends instant mobile alerts to your smartphone when smoke is detected, while interconnecting with existing hardwired residential smoke detectors to bridge whole-home safety to the cloud.
Technical specifications
| Warranty | Warranty: 10-Year Limited Warranty (batteries excluded) Source: Kidde warrantyWarranty is provided by the manufacturer under its own terms. See the source link for full details. |
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Key features
- Connected Wi-Fi fire protection — Connects directly to home 2.4 GHz Wi-Fi networks to send instant push alerts to family members via the Kidde app.
- Replaceable AA battery backup — Two easily replaceable AA alkaline batteries maintain full smoke detection during electrical power interruptions.
- Whole-home smart bridge — Adding one 20SAR-WCA alarm to a hardwired circuit enables mobile notifications when any interconnected Kidde alarm sounds.
- Bilingual voice alerts — Clear spoken verbal announcements accompany the 85 dB audible alarm, stating “Fire! Feu!”.
- Nuisance alarm reduction — Advanced photoelectric sensor chamber reduces false alarms caused by everyday kitchen cooking vapors.
- Smart hush control — Silence nuisance alarms conveniently from the front button or directly through the Kidde mobile app.
Specifications
| Brand | Kidde |
|---|---|
| Model | 20SAR-WCA |
| SKU | 20SAR-WCA |
| Detection type | Smoke |
| Sensor type | Photoelectric |
| Wireless connectivity | 802.11 b/g/n (2.4 GHz) Wi-Fi |
| Primary power | 120 V AC, 60 Hz, 42 mA maximum |
| Battery backup | 2 × AA alkaline replaceable batteries (included) |
| Audible alarm | 85 dB at 3 m (10 ft) with voice alerts |
| Interconnect capability | Hardwire interconnect up to 24 Kidde devices (18 initiating) |
| Smart app support | Kidde App, Amazon Alexa, Google Assistant |
| Operating temperature | 4.4 °C to 37.8 °C (40 °F to 100 °F) |
| Operating humidity | 10% to 95% relative humidity (RH), non-condensing |
| Dimensions | 12.7 cm diameter × 4.4 cm depth (5.0 × 1.7 in) |
| Weight | 0.28 kg (0.62 lb) |
| Standards | CAN/ULC-S531 |
Before you buy
- Requires 120V AC electrical junction box wiring with standard black, white, and interconnect wiring.
- Dedicated smoke alarm only; does not provide carbon monoxide detection (interconnects with Kidde CO alarms for system-wide response).
- Smartphone app functionality requires a 2.4 GHz Wi-Fi home network.
- Includes two AA alkaline backup batteries that should be replaced as indicated by low-battery chirps.
Questions about smart alarm setup or electrical replacement? See the manufacturer documents below or consult your licensed trade contractor.
Frequently asked questions
Does this alarm detect carbon monoxide?
No. The 20SAR-WCA is a dedicated smoke alarm. If connected to an interconnected Kidde CO alarm on the same circuit, it sounds when the CO alarm activates.
What battery backup does the 20SAR-WCA use?
The unit uses two standard AA alkaline batteries, which are easily replaced from the front battery compartment without removing the unit from the ceiling.
Can this alarm alert my phone when I am away from home?
Yes. When connected to your home 2.4 GHz Wi-Fi router, the Kidde app delivers real-time notifications anywhere you have internet connectivity.
Can this alarm make my existing hardwired alarms smart?
Yes. When interconnected with compatible Kidde hardwired alarms, any alarm event on the circuit will trigger this unit to send a mobile app notification.
Does this unit have voice alerts?
Yes. The unit speaks bilingual voice warnings in English and French, stating “Fire! Feu!” during smoke emergencies.
Can I silence the alarm from my phone?
Yes. The Smart Hush feature in the Kidde app allows users to silence temporary nuisance alarms directly from their mobile device.
Does the unit support 5 GHz Wi-Fi networks?
No. The unit connects exclusively to 2.4 GHz Wi-Fi frequency bands.
How many alarms can be connected on one hardwired circuit?
Up to 24 Kidde devices can be interconnected, including up to 18 initiating alarms.
Is there a monthly subscription fee for the app?
No. Basic notifications, status checks, and device management in the Kidde app are free of charge.
What safety standard does this product meet?
The alarm is tested and certified to Canadian safety standard CAN/ULC-S531 for residential smoke alarms.
Documents
- Product data sheet — 20SAR-WCA (PDF)
- User guide & installation manual — 20SAR-WCA (PDF)
- Smart compatibility guide — 20SAR-WCA (PDF)
Specifications derived from official Kidde Canada technical documentation and manufacturer engineering data sheets. Specifications subject to change by manufacturer.
Common questions
Is installation included?
No. AVL Shop sells equipment only. Installation is done by an independent licensed contractor that you hire.
How is freight charged?
Freight cost is included in your written quote before you pay.
What warranty does this product have?
The manufacturer warranty applies. Where we have the manufacturer’s exact wording, it is shown in the Warranty row of the specifications on this page, with a link to the source.
How do I get a quote?
Use Request a quote on this page and send the model and your city or postal code.