I had intended to go with an Aico system but very stupidly hadn’t considered whether it would accommodate the number of sensors we need 😞 Aico has confirmed a hard limit of 18 (published is 12) and we’re planning for 24, possibly 25.

It would appear that FireAngel Pro Connected might fit the bill, but I’m sure I’ve read some negative comments on this forum… can’t seem to find them now though. Another option would be a Grade A system 🤷🏻‍♂️

Also… what are thoughts on voice announcements of which sensor has detected heat/smoke? I like the idea in principle, and would like some kind of link with HA anyway (to turn all the lights on in the event of a fire) so may be able to implement a voice alert too…

Just to add… Building Control “strongly recommended” a Grade D, Category LD1 system.

2 hours ago, fatgus said:

Also… what are thoughts on voice announcements of which sensor has detected heat/smoke? I like the idea in principle, and would like some kind of link with HA anyway (to turn all the lights on in the event of a fire) so may be able to implement a voice alert too…

Always think people overthink this. Mostly around HA etc, Scottish rules seem to be well thought out. Heat alarm only in a kitchen, smoke everywhere else. All interlinked.

How big is your house to need to 24 sensors? We have 4 smoke and 1 heat in a 3 bed bungalow.

Cavius alarms have a limit of 32. They cost more than regular alarms, but they are less obtrusive. If you buy the hub (I haven't), then the app will tell you which alarm was triggered.

2 hours ago, JohnMo said:

Always think people overthink this. Mostly around HA etc, Scottish rules seem to be well thought out. Heat alarm only in a kitchen, smoke everywhere else. All interlinked.

Yes… I appreciate I’m perhaps over complicating things, but at the very least, if there’s an alarm, it makes sense for the lights to all turn on 🤷🏻‍♂️ The system won’t be that expensive and it seems like a reasonable place to spend a little extra “just in case”.

2 hours ago, JohnMo said:

How big is your house to need to 24 sensors? We have 4 smoke and 1 heat in a 3 bed bungalow.

It’s only 4 bedrooms, but a reasonable size. We have quite a few rooms that need covering and a sort of broken-plan layout on the ground floor that includes a kitchen/living space separating two staircases, an open mezzanine etc. I imagine we could get away with less, but it would still be more than Aico can accommodate 🫤

1 hour ago, Mike said:

Cavius alarms have a limit of 32. They cost more than regular alarms, but they are less obtrusive. If you buy the hub (I haven't), then the app will tell you which alarm was triggered.

I’ll take a look at them… thanks @Mike

I'm interested to find out more - are you saying that you can link up the lights in the house to come on when the fire alarm goes off? Does that mean you need some sort of a receiver or some special type of light fitting for that to happen?

10 minutes ago, Indy said:

I'm interested to find out more - are you saying that you can link up the lights in the house to come on when the fire alarm goes off? Does that mean you need some sort of a receiver or some special type of light fitting for that to happen?

It looks like it.

I should have added that, in principle, Cavius makes that easy as they have a cheap RF Relay (CV9004), though you'll find it here, rather than on their own site.

24 minutes ago, Indy said:

I'm interested to find out more - are you saying that you can link up the lights in the house to come on when the fire alarm goes off? Does that mean you need some sort of a receiver or some special type of light fitting for that to happen?

As we’re using Home Assistant we should be able to get some kind of trigger into that, which would allow us to run a Dali lighting scene that’s basically “everything on, full brightness”. I was hoping to be able to get more specific data, like the first sensor to be activated, so we could use text-to-speech to say “smoke detected in the xxxxx” across all the house speakers, but as JohnMo said above there’s a danger of overthinking this and ultimately the main objective is to enable everyone to get out quickly and safely…