Updated September 2026
Data from Amazon and official Heiman and Kidde sites.
2026 verdict
In 2026, the recommendation leans toward Kidde Smart Smoke + Indoor Air Quality Alarm over Heiman HS1SA Series Smoke Alarm, driven by integrations, sensors, and alerts.
What pushes it ahead is integrations, sensors, and alerts, and its broader overall balance keeps the advantage from looking narrow. Heiman HS1SA Series Smoke Alarm can still be the right pick, but only if price and rating outweigh the wider strengths of Kidde Smart Smoke + Indoor Air Quality Alarm. That is enough to make Kidde Smart Smoke + Indoor Air Quality Alarm the better pick for most buyers.
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| Feature | Heiman HS1SA Series Smoke Alarm | Kidde Smart Smoke + Indoor Air Quality Alarm | Winner |
|---|---|---|---|
| Price | £16.14 | $104.86 | Heiman HS1SA Series Smoke Alarm |
| Rating | 4.5 | 3.3 | Heiman HS1SA Series Smoke Alarm |
| Integrations | Samsung SmartThings, Home Assistant | Google Home, Alexa, Home Assistant | Kidde Smart Smoke + Indoor Air Quality Alarm |
| Sensors | Smoke | Smoke, Humidity, Air Quality | Kidde Smart Smoke + Indoor Air Quality Alarm |
| Alerts | Fire Alerts, Low Battery Alerts | Fire Alerts, Low Battery Alerts, Air Quality Alerts | Kidde Smart Smoke + Indoor Air Quality Alarm |
| Connectivity | Zigbee | 2.4 GHz WiFi | Tie |
| Screen | NO | NO | Tie |
| Built-in Siren | YES | YES | Tie |
| Built-in Light | YES | YES | Tie |
| Tests Itself | NO | NO | Tie |
| Pathlight | NO | NO | Tie |
| Steam Check | NO | NO | Tie |
5% OFF
£16.14
£16.99
- + Price: £16.14
- + Rating: 4.5
- - Integrations: Samsung SmartThings, Home Assistant vs Google Home, Alexa, Home Assistant
- - Sensors: Smoke vs Smoke, Humidity, Air Quality
Winner
$104.86
- + Integrations: Google Home, Alexa, Home Assistant
- + Sensors: Smoke, Humidity, Air Quality
- + Alerts: Fire Alerts, Low Battery Alerts, Air Quality Alerts
- - Price: $104.86 vs £16.14
- - Rating: 3.3 vs 4.5
Frequently Asked Questions
Which is better overall: Heiman HS1SA Series Smoke Alarm or Kidde Smart Smoke + Indoor Air Quality Alarm?
Kidde Smart Smoke + Indoor Air Quality Alarm has the stronger overall profile in this comparison, especially for integrations, sensors, and alerts.
What is the biggest difference between Heiman HS1SA Series Smoke Alarm and Kidde Smart Smoke + Indoor Air Quality Alarm?
Price is one of the clearest differences: Heiman HS1SA Series Smoke Alarm lists £16.14, while Kidde Smart Smoke + Indoor Air Quality Alarm lists $104.86.
Which one looks better on price?
Heiman HS1SA Series Smoke Alarm is listed at £16.14, while Kidde Smart Smoke + Indoor Air Quality Alarm is listed at $104.86. 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 integrations.
Who should buy Kidde Smart Smoke + Indoor Air Quality Alarm?
Choose Kidde Smart Smoke + Indoor Air Quality Alarm if your priority is integrations and sensors and that matters more than price.
Full comparison table
Compare all 21 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.
- 21 Smoke & CO Detectors
- 44 specs compared
- 41 filters
YoLinkPhotoelectric Smoke Alarm
$49.99
X-SenseWi-Fi CO Alarm
X-SenseSC07-MR Smart Smoke & CO Alarm
- Heiman
HS1SA Series Smoke Alarm
5% OFF£16.99£16.14 
X-SenseWiFi Smoke & CO Detector
X-SenseWi-Fi Smoke Alarm
GoogleNest Protect (Battery)
$400.00
GoogleNest Protect (Wired)
$449.99
ShellySmoke Alarm
25% OFF€53.43€39.95
X-SenseXC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts
AqaraSmart Smoke Detector
16% OFF€44.99€37.99
KiddeSmart Smoke & CO Detector with Ring
$69.97
First AlertSC5 Battery Smart Smoke & CO Alarm
C$169.99
HeimanSmart CO Alarm
20% OFF$59.99$47.99
HeimanMatter Smoke Detector S1-M
$39.99
First AlertSMCO410 Smoke Detector & CO Alarm
$64.98
KiddeSmart Smoke + Indoor Air Quality Alarm
$104.86
First AlertSC5 Hardwire Smart Smoke & CO Alarm
C$169.99
KiddeSmart Smoke Alarm (P4010ACS-WF)
$40.79
X-SenseSD19-MN Interconnected Smart Smoke Alarm
33% OFF$32.99$21.99
Door & Window SensorsHeimanWindow Door Alarm
4.0(147)$19.98
Gas DetectorsHeimanHS1CG Series Combustible Gas Sensor
Gas DetectorsHeimanWS2CG Series Combustible Gas Detector
Motion SensorsHeimanSmart Motion Sensor
3.2(32)$23.99
Motion SensorsHeimanWiFi Smart Motion Sensor
2.8(43)$12.98
SirensHeimanSmart Siren HS2WD series
$79.99- Smoke & CO DetectorsHeiman
HS1SA Series Smoke Alarm
4.5(5,145)5% OFF£16.99£16.14 - Smoke & CO DetectorsHeiman
Matter Smoke Detector S1-M
3.6(76)$39.99 - Smoke & CO DetectorsHeiman
Smart CO Alarm
3.7(20)20% OFF$59.99$47.99 
Vibration SensorsHeimanSmart Vibration Sensor HS1VS series
$14.90
Water Leak SensorsHeimanSmart Water Leakage Sensor
4.2(40)20% OFF$19.99$15.99
- Smoke & CO DetectorsKidde
Smart Smoke Alarm (P4010ACS-WF)
3.2(317)$40.79 - Smoke & CO DetectorsKidde
Smart Smoke & CO Detector with Ring
4.3(434)$69.97 - Smoke & CO DetectorsKidde
Smart Smoke + Indoor Air Quality Alarm
3.3(198)$104.86 
Water Leak SensorsKiddeWiFi Water Leak & Freeze Detector
3.9(738)51% OFF$34.97$17.14