Winner
Updated November 2026
Data from the official Heiman and Shelly sites.
2026 verdict
Heiman Interconnected Smoke Alarm S1-R edges out Shelly Plus Smoke Alarm in 2026, led by battery life, tests itself, and steam check.
Its biggest wins come from battery life, tests itself, and steam check, and its broader overall balance adds more confidence to the verdict. Shelly Plus Smoke Alarm still makes sense if rating 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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| Feature | Heiman Interconnected Smoke Alarm S1-R | Shelly Plus Smoke Alarm | Winner |
|---|---|---|---|
| Rating | 4.2 | 4.4 | Shelly Plus Smoke Alarm |
| Battery Life | 8.3 years | 5 years | Heiman Interconnected Smoke Alarm S1-R |
| Built-in Light | NO | YES | Shelly Plus Smoke Alarm |
| Tests Itself | YES | NO | Heiman Interconnected Smoke Alarm S1-R |
| Steam Check | YES | NO | Heiman Interconnected Smoke Alarm S1-R |
| Connectivity | 2.4 GHz WiFi, Other | 2.4 GHz WiFi, Bluetooth | Tie |
| Integrations | Google Home, Samsung SmartThings, Home Assistant | Google Home, Samsung SmartThings, Home Assistant | Tie |
| Screen | NO | NO | Tie |
| Sensors | Smoke | Smoke | Tie |
| Alerts | Fire Alerts, Low Battery Alerts | Fire Alerts, Low Battery Alerts | Tie |
| Built-in Siren | YES | YES | Tie |
| Pathlight | NO | NO | Tie |
Winner
Price unavailable right now
- + Battery Life: 8.3 years
- + Tests Itself: YES
- + Steam Check: YES
- - Rating: 4.2 vs 4.4
- - Built-in Light: NO vs YES
7% OFF
£64.81
£69.74
- + Rating: 4.4
- + Built-in Light: YES
- - Battery Life: 5 years vs 8.3 years
- - Tests Itself: NO vs YES
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 battery life, tests itself, and steam check.
What is the biggest difference between Heiman Interconnected Smoke Alarm S1-R and Shelly Plus Smoke Alarm?
Rating is one of the clearest differences: Heiman Interconnected Smoke Alarm S1-R lists 4.2, while Shelly Plus Smoke Alarm lists 4.4.
Who should buy Heiman Interconnected Smoke Alarm S1-R?
Choose Heiman Interconnected Smoke Alarm S1-R if your priority is battery life and tests itself and that matters more than rating.
Who should buy Shelly Plus Smoke Alarm?
Choose Shelly Plus Smoke Alarm if your priority is rating and Built-in light and that matters more than battery life.
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Compare all 28 Smoke & CO Detectors side by side
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Wall Display XL
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