Winner
5% OFF
£16.14
£16.99
Updated September 2026
Data from Amazon and official Heiman and Kidde sites.
2026 verdict
Heiman HS1SA Series Smoke Alarm edges out Kidde Smart Smoke Alarm (P4010ACS-WF) in 2026, led by price, rating, and Built-in light.
It has the clearer edge on price, rating, and Built-in light, and it stays ahead on its broader overall balance. Kidde Smart Smoke Alarm (P4010ACS-WF) still makes sense if its specific feature mix is your priority, but most buyers should still lean toward Heiman HS1SA Series Smoke Alarm. As a general recommendation, Heiman HS1SA Series Smoke Alarm comes out on top.
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| Feature | Heiman HS1SA Series Smoke Alarm | Kidde Smart Smoke Alarm (P4010ACS-WF) | Winner |
|---|---|---|---|
| Price | £16.14 | $40.79 | Heiman HS1SA Series Smoke Alarm |
| Rating | 4.5 | 3.2 | Heiman HS1SA Series Smoke Alarm |
| Built-in Light | YES | NO | Heiman HS1SA Series Smoke Alarm |
| Battery Life | 10 years | 10 years | Tie |
| Connectivity | Zigbee | 2.4 GHz WiFi | Tie |
| Integrations | Samsung SmartThings, Home Assistant | Google Home, Alexa, 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 |
| Steam Check | NO | NO | Tie |
Winner
5% OFF
£16.14
£16.99
- + Price: £16.14
- + Rating: 4.5
- + Built-in Light: YES
- - Price: $40.79 vs £16.14
- - Rating: 3.2 vs 4.5
Price history compared
Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.
- Heiman HS1SA Series Smoke Alarm
- Kidde Smart Smoke Alarm (P4010ACS-WF)
Loading price history...
Frequently Asked Questions
Which is better overall: Heiman HS1SA Series Smoke Alarm or Kidde Smart Smoke Alarm (P4010ACS-WF)?
Heiman HS1SA Series Smoke Alarm has the stronger overall profile in this comparison, especially for price, rating, and Built-in light.
What is the biggest difference between Heiman HS1SA Series Smoke Alarm and Kidde Smart Smoke Alarm (P4010ACS-WF)?
Price is one of the clearest differences: Heiman HS1SA Series Smoke Alarm lists £16.14, while Kidde Smart Smoke Alarm (P4010ACS-WF) lists $40.79.
Which one looks better on price?
Heiman HS1SA Series Smoke Alarm is listed at £16.14, while Kidde Smart Smoke Alarm (P4010ACS-WF) is listed at $40.79. 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 the competing advantages.
Who should buy Kidde Smart Smoke Alarm (P4010ACS-WF)?
Choose Kidde Smart Smoke Alarm (P4010ACS-WF) if your priority is its specific strengths 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
YoLinkPhotoelectric Smoke Alarm
$49.99
HeimanMatter Smoke Detector S1-TM
$49.98
GoogleNest Protect (Wired)
$449.99
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)
$406.99
ShellySmoke Alarm
25% OFF€53.43€39.95
KiddeSmart Smoke & CO Detector with Ring
$69.97
X-SenseXC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts
AqaraSmart Smoke Detector
16% OFF€44.99€37.99
HeimanInterconnected Smoke Alarm S1-R
$25.99
HeimanInterconnected CO Alarm C1-R
10% OFF$29.98$26.99
First AlertSC5 Battery Smart Smoke & CO Alarm
HeimanSmart CO Alarm
20% OFF$59.99$47.99
HeimanMatter Smoke Detector S1-M
$39.99
First AlertSMCO410 Smoke Detector & CO Alarm
11% OFF$64.98$57.99
KiddeSmart Smoke + Indoor Air Quality Alarm
$106.72
Door & Window SensorsHeimanWindow Door Alarm
4.0(148)$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
Interconnected CO Alarm C1-R
4.0(24)10% OFF$29.98$26.99 - Smoke & CO DetectorsHeiman
Interconnected Smoke Alarm S1-R
4.3(51)$25.99 - Smoke & CO DetectorsHeiman
Matter Smoke Detector S1-M
3.6(77)$39.99 - Smoke & CO DetectorsHeiman
Matter Smoke Detector S1-TM
4.8(7)$49.98 - Smoke & CO DetectorsHeiman
Smart CO Alarm
3.7(21)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 DetectorsKiddeSmart Smoke Alarm (P4010ACS-WF)
3.2(316)$40.79- Smoke & CO DetectorsKidde
Smart Smoke & CO Detector with Ring
4.4(445)$69.97 - Smoke & CO DetectorsKidde
Smart Smoke + Indoor Air Quality Alarm
3.3(198)$106.72 
Water Leak SensorsKiddeWiFi Water Leak & Freeze Detector
3.9(737)37% OFF$34.97$21.99