You probably got the older HS1SA (Standalone) model which does not work well with HA although it has a Zigbee module build in.
Check the date code on the little leaflet inside the battery compartment and/or the Zigbee Model within Z2M. It should at least read “SmokeSensor-EF-3.0” (as for the HS1SA-E (Zigbee 3.0)).
If the model reads something like “SMOK_V1x” it wont work as expected within HA (unsupported).
More about the different models HERE.
Thanks for the suggestion. All other devices (around 30 of them from different vendors) work very reliably, so I don’t think it’s the network.
Thank you for the explanation. You’re right, I have the “broken” first generation Zigbee smoke detector from Heiman. I’m still disappointed that they sold an essentially faulty product back then.
I’m hoping to replace them with Thread/Matter enabled smoke detectors in a year or two. But I’m not buying first generation products this time around 
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what kind of issues there? maybe I can help.
It was great to see this news as just a few days prior I had specced Heiman smoke alarms for a renovation of our apartment building, choosing them over Cavius. The one thing I was personally disappointed by with this decision (since it affected me and my Home Assistant setup but not any other owners) was that Cavius does offer a way to integrate some of their alarms with a home automation setup, while Heiman doesn’t appear to. Specifically the HM2SA-1 model.
We have to use this model here in New Zealand as recent building code changes require multiple smoke alarms per dwelling (hallways, each bedroom, and each level), each with a 10-year battery and they must be wirelessly interconnected so they all sound if one is triggered.
The HM2SA-1 model meets all these requirements and does have a remote (which I put in for each apartment) but there doesn’t seem to be a gateway that can connect each set of interlinked alarms to a Home Assistant (or equivalent home automation) setup.
Does anyone know if such a gateway exists, though? Perhaps I just missed it? Or maybe one is planned for the future?
@CJB I think that you juat bought the wrong model (i.e. you bought a SKU with no wireless capability). The “HS1SA” model with no additional letters in its SKU model number is not a “smart home” connected device. Sounds like the HM3RC series you linked to only support interconnecting smoke detectors using basic single directional RF433/RF868/RF915 and no more regardless.
Heiman sell several different models of smoke detectors that look the same on the outaide, both for various smart home wireless protocols as well as dumb variants with no wireless capabilities. You should therefore also notice the difference in price between those devices if sold by the same seller.
Anyway, to be able to use one with Home Assistant today you should have bought either the Heiman Matter Smoke Alarm (SKU/model HS1SA-M) or the Heiman Zigbee Smoke Alarm (SKU/model HS1SA-Z), of which I understand only the first is currently certified for the WWHA program.
There is also a Heiman WiFi Smoke Alarm (SKU/model HS1SA-W) that can work indirectly via a Tuya gateway but that is not recommended (particularly because it needs an external gateway and partially because batteries do not last long in Wi-Fi devices).
Thanks for your thoughts, @Hedda. I had to prioritise compliance with our building codes over smart home integration (otherwise we wouldn’t have received final inspection signoff from the council), and that’s why I had to choose the HM2SA model.
And that’s actually my point: there doesn’t seem to be a model from Heiman that is both capable of integration with a smart home and is compliant with our new local building code. To be compliant the alarms needs to talk to each other so they all sound when one triggers (possibly using the older power-efficient RF radios), while us here on this forum know that they also need to have some modern radio like Zigbee/Wifi to talk to Home Assistant.
That’s a tough ask because our 10-year battery requirement likely means that each detector (to keep size attractive) wouldn’t be able to talk Zigbee/Wifi which is why I was thinking of an additional gateway unit that can be mains-powered; this could be joined to a group of RF-interlinked detectors in the same way as the remote and then it could also be connected to the home automation network. (In my ideal world it would be POE and then I can just hook it into my LAN, plus Wifi with a USB-C power option because that would work for many others.)
I was originally planning to use the HS1SA units like you mentioned, but while these do say “interconnected” in their marketing material, from what I could tell this only means participating in a regular Zigbee mesh network, and not a ‘smoke alarm network’ for the purpose of all sounding in the event one is triggered; this lack means they are not compliant here for new homes or after a renovation. (Strangely enough they also failed because our code requires the 10-year battery to be non-replaceable - thanks very much to our regulators for that little gem!)
Anyway, fingers crossed that Heiman’s product design team may be able to take a look at my gateway idea at some point when they’re bored.
First of all, whatever you do I recommend that tou completely forget about WiFi devices, those are more or less generally useless for security and safety devices. Also remember that Zigbee and Z-Wave are not WIFi but work though their own selfcontained mesh networks so those are generally great for security and safety devices.
FYI, both the Zigbee standard and the Z-Wave standard have their own interlink technology which can a linked peer-to-peer connection within its network between individual devices that support it to each other so they can communicate directly even when the central coordinator/controller is down. Zigbee calls this Zigbee binding and Z-Wave call it Z-Wave association. So if you buy a Zigbee or Z-Wave device that support it then you can connect it to a smart home and then configure Zigbee bindings and Z-Wave associations, (tip is to buy the same brand and model to make sure it works). I would think that proper such setup should meet the interlinking compliance requirements.
The whole point is with those interlinking features is that they will always work peer-to-peer even when the gateway is not available for whatever reason.
I do not know if any Heiman devices can meet those 10-year requirements, but FYI there are at least other Z-Wave devices that can meet that 10-year battery requirement.
For example I myself own three HeatIt Z-Smoke smoke detectors of their mains-powered Z-Wave devices which have a rechargeable battery as backup (and support Z-Wave associations for interlinked setup), though I believe those specific models are currently only available for the European market (see Sensors - Heatit ).
Anyway, how i personally workes around this issue in the past is to simply combine using both dumb smoke detectors (to meet compliance) and smart smoke detectors (Zigbee and Z-Wave variants) in the same room/area, as that way you get best of both worlds, and there are no laws here that say that you can not have multiple smoke detectors of different models in the same room/area.
Regardless, Heiman’s Zigbee smoke detectors work great from my experience so far and they are very inexpensive so I have generally doubled up on smoke detectors in our house, as my thinking is that you can never have too many smoke detectors so it doea not hurt to use a combination of dumb and smart smoke detectors in the same rooms around the house/building! 
Another Kiwi checking in here… I just found out about our new laws requiring interlinked fire alarms for any new builds or building consents, apparently their reason was that too many irresponsible people just weren’t replacing the batteries (or removing entirely once flat because of the annoying “ceiling bird” chirping), and then in a fire the alarm was no good.
Because that’s an adult problem which children can’t do anything about, and kids were dying more than adults due to being stuck in cots etc., the govt ended up taking a heavy-handed approach forcing 10-year non-replaceable batteries to avoid both of the afore-mentioned problems. Not sure the new law will do anything
Which leaves me in the position of having just added new smoke alarms 6 months ago, unawares of the incoming changes, and now a planned renovation which will force me to add a whole bunch more interlinked ones, with no smart options available right when I’d love to add smart ones instead. Lovely.
Anyway, if Heiman can implement smart interlinked alarms that meet the NZ requirements, or @CJB 's idea of a smart hub that connects to such alarms, I’ll be in the market for a small house lot (8) in a few months lol.
The only way to make that work without doing a special unit for the NZ market (probably not economic) might be mains-powered ones with backup batteries.
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Or, I’ll just have to bite the bullet and get double-ups, and put some extra smart ones in the most important rooms (yuck).
Hey Albert, thanks for that background info, it’s good to have some idea of what the regulators were thinking. I agree with you that the new regs are unlikely to make a difference, since the people with money to renovate or buy new places are unlikely to be the same ones who aren’t putting in new alarms, and the new regs don’t affect existing properties which means they are allowed to replace their current alarms with ones that aren’t compliant with the new regs.
I debated whether to post this next info since it is off-topic for the news of Heiman joining WwHA, but in the end I’ve decided to because 1) it may help Albert and 2) if Heiman sees what the competition is doing then it may encourage them to develop the new product that I personally believe will be a big seller for them and useful for this community. (I apologise if anyone objects to this opinion.)
So @F0551L: if Heiman hasn’t come to the party in time for your reno, then may I suggest you check out the Cavius range. Specifically the 2107 CAV10WF smoke alarms for each room, plus either the SmartSense Hub for connecting the alarm sensor group to your LAN or (if you have a burglar alarm that is connected to your HAss setup) the Smoke Detector Relay Switch for connecting the alarm sensor group to your burglar alarm.
And Heiman/@leoXie: I genuinely believe in your alarm products, as I did a lot of research into the options before I recommended them to our architect, construction company and body corporate, and we then bought a heap of them for every single apartment in our complex. Your product had the right balance of quality (ie. lack of false positives and good battery longevity reports from other owners), features and price and met the new NZ Building Code requirements but I am still wistful that I missed out on the ability to integrate your alarms with my HAss setup. So I hope you’ll take a look at this thread, and the Cavius products that can do what I talked about above, and see if you’re able to come up with an even better gateway product that can:
I’m quite sure you’d easily sell these globally and not just here in NZ. If you need anyone to product test I’d absolutely be willing to help you out wherever I can. 
Mains powered, interlink independent of a smart home system and zigbee for smart home system comms. Those are my boxes to tick.
Update: And heat detection option with all the above for kitchens - thanks @ChrisThomas for reminding me of that. It might not be in the regs, but not having burnt toast setting off all the alarms is a good thing.
I know these features take time implement and are sometimes dropped because of unseen complexities, HOWEVER, I would absolutely buy 3/4 of these if they were hardwired interlinked.
A heat detection model, for placement in kitchens would be icing on top of the cake! A heat detection sensor for placement in the kitchen has become the standard for implementation in Wales and could well come to the rest of the UK in time.
FYI, Heatit and their smoke detector has now also joined the Works with Home Assistant program
They have so far only certied their newer Heatit Z-Smoke2 Detector 230VAC (Z-Wave device):
However they have not yet certified their two other Heatit Z-Smoke Multisensor smoke dectors:
Anyway, those at least supports devices to be serially connected with other devices in order to meets the smoke detector requirements as specified in SS-EN 14604 / EN 14604 for Europe.
Hey CJB,
Are you looking for this suite?
We are developing the Heiman Home integration and it should able to use with HomeAssitant.
I am not bored but we do browse the forum from time to time, if I missed it, you can DM me anytime, would you mind that I DM you for more details?
Thanks Albert,
I will check it, and get back to you.
Many thanks, @leoXie - the gateway portion of the kit you linked does look very good! From what I could tell from the product link (the product images were in German) it does seem to match what we need. Is that gateway compatible with the HM2SA-1 model that’s sold in New Zealand?
Amazon Germany won’t send those bundles to NZ, plus we only need the gateway itself since we have installed the alarms already, so might you know if the distributors here will be able to sell the gateways individually soon, like Cavius does now?
And of course, you’re welcome to DM any time, I’d be very happy to help with whatever info you or your team need. 
I bought what was referred to as a remote control for my interlinked Heiman smoke alarms from JA Russell in Tauranga. I’m hoping that’s a “Gateway” (https://www.jarussell.co.nz/Portals/0/Heiman_Brochure.pdf).
Unfortunately it’s not a gateway @nononcents, but still useful to have, especially with the new requirement that all alarms sound when one sensor is triggered; the remote gives you a single place to go to that can silence all the alarms. It also makes testing the alarms much easier, since you don’t need to reach the ceiling.
For the units in my body corporate, we mounted a remote in each kitchen next to the light switch, as that was the most central location.