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Smoke & CO Detectors · Head to head

Heiman Interconnected CO Alarm C1-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 CO Alarm C1-R is the more complete option versus Shelly Plus Smoke Alarm in 2026, helped most by price, battery life, and tests itself.
Heiman Interconnected CO Alarm C1-R
Winner
Heiman Interconnected CO Alarm C1-R
$26.99$29.9810% OFF
Buy on Amazon USACheck price
It builds its lead on price, battery life, and tests itself, then backs it up with a stronger showing on its broader overall balance. The only strong reason to choose Shelly Plus Smoke Alarm is if rating, integrations, and Built-in light are more important to you than the overall verdict. For the average buyer, Heiman Interconnected CO Alarm C1-R is the safer choice.
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FeatureHeiman Interconnected CO Alarm C1-RShelly Plus Smoke AlarmWinner
Price$26.99€39.95Heiman Interconnected CO Alarm C1-R
Rating4.04.4Shelly Plus Smoke Alarm
Battery Life10 years5 yearsHeiman Interconnected CO Alarm C1-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 CO Alarm C1-R
Connectivity2.4 GHz WiFi, Other2.4 GHz WiFi, BluetoothTie
ScreenNONOTie
SensorsCOSmokeTie
AlertsCO Alerts, Low Battery AlertsFire Alerts, Low Battery AlertsTie
Built-in SirenYESYESTie
PathlightNONOTie

Frequently Asked Questions

Which is better overall: Heiman Interconnected CO Alarm C1-R or Shelly Plus Smoke Alarm?

Heiman Interconnected CO Alarm C1-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 CO Alarm C1-R and Shelly Plus Smoke Alarm?

Price is one of the clearest differences: Heiman Interconnected CO Alarm C1-R lists $26.99, while Shelly Plus Smoke Alarm lists €39.95.

Which one looks better on price?

Heiman Interconnected CO Alarm C1-R is listed at $26.99, while Shelly Plus Smoke Alarm is listed at €39.95. Heiman Interconnected CO Alarm C1-R (better spec).

Who should buy Heiman Interconnected CO Alarm C1-R?

Choose Heiman Interconnected CO Alarm C1-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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