Winner
Data from Amazon and official Heiman and Shelly sites.
2026 verdict
Across the full comparison in 2026, Heiman HS1SA Series Smoke Alarm earns the nod. It has the clearer edge on price, rating, and battery life, and it stays ahead on its broader overall balance. Shelly Plus Smoke Alarm is still relevant if you care most about connectivity and integrations, but Heiman HS1SA Series Smoke Alarm is the stronger recommendation overall. Overall, Heiman HS1SA Series Smoke Alarm makes more sense for most people.
| Feature | Heiman HS1SA Series Smoke Alarm | Shelly Plus Smoke Alarm | Winner |
|---|---|---|---|
| Price | £16.14 | €39.95 | Heiman HS1SA Series Smoke Alarm |
| Rating | 4.4 | 4.3 | Heiman HS1SA Series Smoke Alarm |
| Battery Life | 10 years | 5 years | Heiman HS1SA Series Smoke Alarm |
| Connectivity | Zigbee | 2.4 GHz Wifi, Bluetooth | Shelly Plus Smoke Alarm |
| Integrations | Home Assistant | Google Home, Alexa, Samsung SmartThings, Home Assistant | Shelly Plus Smoke Alarm |
| 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 |
| Built-in Light | YES | YES | Tie |
| Tests Itself | NO | NO | Tie |
| Pathlight | NO | NO | Tie |
Winner
5% OFF
£16.99
£16.14
- + Price: £16.14
- + Rating: 4.4
- + Battery Life: 10 years
- - Connectivity: Zigbee vs 2.4 GHz Wifi, Bluetooth
- - Integrations: Home Assistant vs Google Home, Alexa, Samsung SmartThings, Home Assistant
25% OFF
€53.43
€39.95
- + Connectivity: 2.4 GHz Wifi, Bluetooth
- + Integrations: Google Home, Alexa, Samsung SmartThings, Home Assistant
- - Price: €39.95 vs £16.14
- - Rating: 4.3 vs 4.4
Frequently Asked Questions (FAQ)
- Which is better overall: Heiman HS1SA Series Smoke Alarm or Shelly Plus Smoke Alarm?
- Heiman HS1SA Series Smoke Alarm has the stronger overall profile in this comparison, especially for price, rating, and battery life.
- What is the biggest difference between Heiman HS1SA Series Smoke Alarm and Shelly Plus Smoke Alarm?
- Price is one of the clearest differences: Heiman HS1SA Series Smoke Alarm lists £16.14, while Shelly Plus Smoke Alarm lists €39.95.
- Which one looks better on price?
- Heiman HS1SA Series Smoke Alarm is listed at £16.14, while Shelly Plus Smoke Alarm is listed at €39.95. Heiman HS1SA Series Smoke Alarm (better spec).
- Who should buy Heiman HS1SA Series Smoke Alarm?
- Choose Heiman HS1SA Series Smoke Alarm if your priority is price and rating and that matters more than connectivity.
- Who should buy Shelly Plus Smoke Alarm?
- Choose Shelly Plus Smoke Alarm if your priority is connectivity and integrations and that matters more than price.
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