Why I don't use hardwired smoke alarms:
A fire could melt the insulation somewhere in the house on the circuit where the are connected and trip the RCD breaker. Electrical fires are the most common source of fire so the risk of a breaker tripping is highly likely.
And if it needs a battery as backup then whats the point of 240V anyway.
Both ionisation AND photoelectric are recommended(despite the claim in your link). All the much cheaper ones I use from department stores work fine and don't need any holes cut out.
Woolies has one with built in 10 year Li-ion battery I think for $40, which would be about the cost of 10 Duracell 9V blocks alone.
Wireless makes sense if you want to remotely detect a fire in the garage but I see no need to buy 7.
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