I've got a Guardall Astra Micra S-8 dual-tech over a large radiator, and it works fine. However, the radiator is on a condensing boiler, and gets nowhere near as hot as radiators on conventional central heating boilers.
Honeywell (Ademco) Galaxy 60.
Ideally, I would like to install the sensor/keypad cables myself, and then let an installer do the hardware. I doubt if Ademco will allow me to buy the Galaxy direct from them.
I like the Galaxy 60 because I can use it as a quasi-home automation controller.
Comfort is good for that, and they do supply and support DIY installs, as well as professional installs. Also, they make all the interfacing specs available, so quite a lot of people design their own kit to interface to the alarm. However, it's not cheap.
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