Its true that the heating controls use the same frequency range as the wireless intruder system, 868 ish,
On 433.92 MHz there is only one channel. A good system will monitor the channel and if it is busy then wait until it is clear before transmitting. Or it will transmit and wait for acknowlement. If does not receive an acknowledgement then it will repeat the transmission.however both systems are supposed to look for the clearest channel to minimise interference.
Sidebands and other spurious emmissions are responsible for this effect. Spurious emissions come not only from the radio transmitter but also from the switched mode power supply and other parts of the routers electronics.Also had reports that wireless routers different frequency to the alarm system, dualcoms and other devices also interfere with radio devices.
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