Heiman HS1SA Series Smoke Alarm vs Shelly Plus Smoke Alarm

The Heiman HS1SA Series Smoke Alarm takes it overall on value, with a lower price, a higher owner rating and a 10-year battery rating versus the Shelly's 5 years. The Shelly Plus Smoke Alarm counters with hub-free WiFi and broader smart home platform support.

No. Both the Heiman HS1SA Series Smoke Alarm and the Shelly Plus Smoke Alarm are smoke-only devices with no CO sensor, so either one needs to be paired with a separate carbon monoxide detector for full protection.

Connectivity. The Shelly Plus Smoke Alarm connects over WiFi with no hub and works with Google Home, Alexa, SmartThings and Home Assistant, while the Heiman HS1SA Series Smoke Alarm is a Zigbee device that needs a compatible hub and reaches only SmartThings and Home Assistant.

The Heiman HS1SA Series Smoke Alarm is the cheaper unit and its DC3V lithium cell is rated for 10 years, while the Shelly Plus Smoke Alarm uses a CR123A cell rated for about 5 years. The Heiman leads on both up-front cost and rated battery longevity.

Buy the Heiman HS1SA Series Smoke Alarm if you want a low-cost, discreet standalone smoke alarm with a long battery rating for a bedroom, hallway or campervan, and only need Zigbee smart features through a hub you already own.

Buy the Shelly Plus Smoke Alarm if you want hub-free WiFi setup and broad support for Google Home, Alexa, SmartThings and Home Assistant with automations, and you value that flexibility over the Heiman's lower price and longer battery rating.