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Smoke & CO Detectors · Head to head

Heiman Interconnected Smoke Alarm S1-R vs Shelly Plus Smoke Alarm

Full Smart Smoke & CO Detectors comparison in 2026

Data from Amazon and official Heiman and Shelly sites.
2026 verdict
Heiman Interconnected Smoke Alarm S1-R edges out Shelly Plus Smoke Alarm in 2026, led by price, battery life, and tests itself.
Heiman Interconnected Smoke Alarm S1-R
Winner
Heiman Interconnected Smoke Alarm S1-R
$25.99
Buy on Amazon USACheck price
Its biggest wins come from price, battery life, and tests itself, and steam check adds more confidence to the verdict. Shelly Plus Smoke Alarm still makes sense if rating, integrations, and Built-in light are your priority, but most buyers should still lean toward Heiman Interconnected Smoke Alarm S1-R. As a general recommendation, Heiman Interconnected Smoke Alarm S1-R comes out on top.
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FeatureHeiman Interconnected Smoke Alarm S1-RShelly Plus Smoke AlarmWinner
Price$25.99€39.95Heiman Interconnected Smoke Alarm S1-R
Rating4.24.4Shelly Plus Smoke Alarm
Battery Life8.3 years5 yearsHeiman Interconnected Smoke Alarm S1-R
IntegrationsGoogle Home, Samsung SmartThings, Home AssistantGoogle Home, Alexa, Samsung SmartThings, Home AssistantShelly Plus Smoke Alarm
Built-in LightNOYESShelly Plus Smoke Alarm
Tests ItselfYESNOHeiman Interconnected Smoke Alarm S1-R
Steam CheckYESNOHeiman Interconnected Smoke Alarm S1-R
Connectivity2.4 GHz WiFi, Other2.4 GHz WiFi, BluetoothTie
ScreenNONOTie
SensorsSmokeSmokeTie
AlertsFire Alerts, Low Battery AlertsFire Alerts, Low Battery AlertsTie
Built-in SirenYESYESTie

Frequently Asked Questions

Which is better overall: Heiman Interconnected Smoke Alarm S1-R or Shelly Plus Smoke Alarm?

Heiman Interconnected Smoke Alarm S1-R has the stronger overall profile in this comparison, especially for price, battery life, and tests itself.

What is the biggest difference between Heiman Interconnected Smoke Alarm S1-R and Shelly Plus Smoke Alarm?

Price is one of the clearest differences: Heiman Interconnected Smoke Alarm S1-R lists $25.99, while Shelly Plus Smoke Alarm lists €39.95.

Which one looks better on price?

Heiman Interconnected Smoke Alarm S1-R is listed at $25.99, while Shelly Plus Smoke Alarm is listed at €39.95. Heiman Interconnected Smoke Alarm S1-R (better spec).

Who should buy Heiman Interconnected Smoke Alarm S1-R?

Choose Heiman Interconnected Smoke Alarm S1-R if your priority is price and battery life and that matters more than rating.

Who should buy Shelly Plus Smoke Alarm?

Choose Shelly Plus Smoke Alarm if your priority is rating and integrations and that matters more than price.

Full comparison table

Compare all 24 Smoke & CO Detectors side by side

You are looking at two of them. The full table lines up all Smoke & CO Detectors in the catalog with the same specs, so you can filter by what you need and sort by price or rating.

  • 24 Smoke & CO Detectors
  • 44 specs compared
  • 41 filters
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