Heiman HS1SA Series Smoke Alarm vs Heiman Smart CO Alarm

Same brand, different hazard: the Heiman HS1SA Series Smoke Alarm takes this Heiman-vs-Heiman matchup on the strength of its lower price and higher owner rating, while the Heiman Smart CO Alarm brings the wider smart home reach instead, connecting to Google Home, Alexa, Apple HomeKit, Samsung SmartThings and Home Assistant through Matter over Thread versus the HS1SA's Zigbee-and-hub setup. The two are not really competing for the same job: the HS1SA is a compact, adhesive-mountable smoke-only alarm, while the Smart CO Alarm detects only carbon monoxide, so most households will end up wanting both rather than choosing one over the other. Both run on a replaceable battery rated for about a decade and include a built-in siren and light for local alerts. Buyers who need a discreet, budget smoke alarm for a bedroom or hallway should get the Heiman HS1SA Series Smoke Alarm, while anyone monitoring a gas appliance or attached garage for carbon monoxide, and who wants broad Matter compatibility, should pick the Heiman Smart CO Alarm.