Google Nest Protect (Wired) vs Heiman HS1SA Series Smoke Alarm

Buy the Google Nest Protect (Wired) if you want the fuller safety device: it detects both smoke and carbon monoxide, packs extra sensors, tests itself, and carries a higher owner rating. The Heiman HS1SA Series Smoke Alarm is the budget choice, a smoke-only unit that wins clearly on price.

Scope and price. The Google Nest Protect (Wired) is a mains-powered smoke-and-CO alarm with self-test, a pathlight and Google Home and Home Assistant support, while the Heiman HS1SA Series Smoke Alarm is a small, low-cost smoke-only alarm that can also act as a Zigbee sensor through a compatible hub.

No. The Heiman HS1SA Series Smoke Alarm senses smoke only, so it needs a separate CO detector for carbon monoxide coverage. The Google Nest Protect (Wired) covers both smoke and CO in a single unit.

The Google Nest Protect (Wired) runs on house mains power with a battery backup and is meant for homes with alarm wiring, while the Heiman HS1SA Series Smoke Alarm runs on a sealed DC3V lithium cell rated for 10 years and mounts with screws or an adhesive pad, needing no wiring at all.

Buy the Google Nest Protect (Wired) if you have hardwired alarm wiring and want combined smoke and carbon monoxide detection with spoken early warnings, phone alerts, self-testing and a pathlight, in a Google or Nest household.

Buy the Heiman HS1SA Series Smoke Alarm if you want an inexpensive, discreet standalone smoke alarm for a bedroom, hallway or campervan, and optionally want to fold it into a Zigbee smart home through a SmartThings or Home Assistant hub.