Updated October 2026
Data from the official Heiman site.
2026 verdict
Heiman Smoke Alarm HM-636PHS is the more complete option versus Heiman Interconnected CO Alarm C1-R in 2026, helped most by price, rating, and steam check.
It builds its lead on price, rating, and steam check, then backs it up with a stronger showing on its broader overall balance. Heiman Interconnected CO Alarm C1-R is still relevant if you care most about connectivity and integrations, but Heiman Smoke Alarm HM-636PHS is the stronger recommendation overall. That keeps the verdict firmly in favor of Heiman Smoke Alarm HM-636PHS.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
Winner
17% OFF
Prime exclusive deal$24.99
$29.99
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| Feature | Heiman Interconnected CO Alarm C1-R | Heiman Smoke Alarm HM-636PHS | Winner |
|---|---|---|---|
| Price | $31.99 | $24.99 | Heiman Smoke Alarm HM-636PHS |
| Rating | 4.1 | 4.2 | Heiman Smoke Alarm HM-636PHS |
| Connectivity | 2.4 GHz WiFi, Other | None | Heiman Interconnected CO Alarm C1-R |
| Integrations | Google Home, Samsung SmartThings, Home Assistant | None | Heiman Interconnected CO Alarm C1-R |
| Steam Check | NO | YES | Heiman Smoke Alarm HM-636PHS |
| Battery Life | 10 years | 10 years | Tie |
| Screen | NO | NO | Tie |
| Sensors | CO | Smoke | Tie |
| Alerts | CO Alerts, Low Battery Alerts | Fire Alerts, Low Battery Alerts | Tie |
| Built-in Siren | YES | YES | Tie |
| Built-in Light | NO | NO | Tie |
| Tests Itself | YES | YES | Tie |
$31.99
- + Connectivity: 2.4 GHz WiFi, Other
- + Integrations: Google Home, Samsung SmartThings, Home Assistant
- - Price: $31.99 vs $24.99
- - Rating: 4.1 vs 4.2
Winner
17% OFF
Prime exclusive deal$24.99
$29.99
- + Price: $24.99
- + Rating: 4.2
- + Steam Check: YES
- - Connectivity: None vs 2.4 GHz WiFi, Other
- - Integrations: None vs Google Home, Samsung SmartThings, Home Assistant
Frequently Asked Questions
Which is better overall: Heiman Interconnected CO Alarm C1-R or Heiman Smoke Alarm HM-636PHS?
Heiman Smoke Alarm HM-636PHS has the stronger overall profile in this comparison, especially for price, rating, and steam check.
What is the biggest difference between Heiman Interconnected CO Alarm C1-R and Heiman Smoke Alarm HM-636PHS?
Price is one of the clearest differences: Heiman Interconnected CO Alarm C1-R lists $31.99, while Heiman Smoke Alarm HM-636PHS lists $24.99.
Which one looks better on price?
Heiman Interconnected CO Alarm C1-R is listed at $31.99, while Heiman Smoke Alarm HM-636PHS is listed at $24.99. Heiman Smoke Alarm HM-636PHS (better spec).
Who should buy Heiman Interconnected CO Alarm C1-R?
Choose Heiman Interconnected CO Alarm C1-R if your priority is connectivity and integrations and that matters more than price.
Who should buy Heiman Smoke Alarm HM-636PHS?
Choose Heiman Smoke Alarm HM-636PHS if your priority is price and rating and that matters more than connectivity.
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