I have an old timey D8112 Radionics panel at my new house and want to replace the original heat detectors and smoke detectors. I don't want to replace the security panel at this time given that it works OK. Looking at the compatibility charts for this (and the web site compatibility info at Bosch and System Sensor) I see that they list this info for smoke detectors but nothing about compatibility for heat detectors. Is it safe to assume that I won't have an issue with the heat dectectors from a particular vendor? (I have 7 2-wire heat detectors and a 4-wire smoke detector in one zone with a 12V line) I suspect that is the case given that I currently have Edwards GS heat detectors installed. I'm leaning towards System Sensor detectors because it appears to be a challenge to find Bosch vendors online (and would use the same vendor for all the detectors).
I'd also like to add 3 smoke detectors (for bedrooms for a total of11). Pubs indicate that there is 10 detector limit for one zone with 2-wire alarms. Not sure why a 4-wire was put on the system for single smoke detector, but my reading indicates that I can hook up more 4-wire alarms without a limitation, so I wanted to confirm that adding 3 4-wire alarms hooked up to the original 4-wire would work fine (and allow me to have 11 detectors in one zone). I'd planned on letting someone else do this part, but having trouble getting someone to do the work without trying to sell me an upgraded Bosch/Radionics security panel.
Thanks for any pointers.