Replacement mains powered smoke alarms needed

[eldnew]

Firex smoke alarms were installed when my house was built in 2000. Firex models have now been discontinued. I'm looking to replace them but want to know if there are any compatible models which will fit into the existing base plate or will I have to get the whole system reinstalled.
I have a PG240 and an IAR230C

 

[Chri5]

I wouldn't concern yourself with bases, new units with new bases add about 5 minutes to the installation time, hardly a show stopper.

Here's a range of alarms that should suit your need to replace

http://www.tlc-direct.co.uk/Main_Index/Fire_and_Smoke/Smoke_Alarms_Mains_Lithium/index.html

 

[RMS]

I Would suggest Aico smoke alarms. Mains powered with lithium battery back up. These are designed to last for a period of 10 years and come with a 5 year guarentee.

Also ensure you select the correct type of alarm for the location.

http://www.aico.co.uk/

 

[OwainDIYer]

the drawback to replacing bases can be an unpainted patch of ceiling.

 

[eldnew]

Thanks for your replies.

I was hoping to be able to just attach a new smoke alarm to the base I already have, rather than having to put up a new base - which may mean redecorating the ceiling, as pointed out OwainDIYer.
Original suppliers Sensotec no longer seem to supply the alarms so I might have to replace them completely.

 

[Chri5]

Measure the existing units footprint, and see what is similar or over that size from the link I posted?