I was thinking along similar lines - not quite as sophisticated as that (actually controlling flow to the kitchen tap) but, rather, simply a flow sensor in the bathroom hot feed which activated some sort of audible alarm/bell downstairs.
Are there no pipes at all between boiler/kitchen and bathroom that are accessible (e.g. under bath etc.)?Finally some decent advice!! ... Unfortunately iv done my kitchen up fully tiled so no access to pipes going upstairs anymore
That's a bit different from the 'usual' problem with a combi-boiler, and could perhaps be addressed by improvements to the cold water plumbing system. However, in terms of the idea discussed above, a flow sensor on just the hot (or, indeed, just the cold) feed to the bathroom could be used to run a bell/sounder in the kitchen.
Exactly what sort of consequences of 'interference' are you experiencing. Many of us have countless 433 MHz devices in our homes without any obvious or major problems (just occasional slowness of responses). Particularly given that the wireless doorbell you propose would presumably be used only occasionally, are the 'consequences' not things you can live with?
You might also try, whether it will work or not I am not sure, but does tend to work with me, under the sink you have ball valve isolators to cold and hot water taps, to facilitate changing washers etc, without turning the whole water supply, these ball valve isolators could be adjusted with a screwdriver to such a position to give you a limited flow to kitchen hot water tap, enough to allow the boiler to fire i.e. 3 to 4 liters per min yet restrict full water when the tap is fully open, this could allow a person taking a shower to at least not get any hot water but some, so you don't get soaked in completely cold water, ater, I I found no matter how many times I told my wife not to open hot water when I am taking a shower, that bitch always does that, I think she hates me and is only sticking with me for my money!
Be careful. She may run off with a poor man who has a heat only boiler with vented hot water cylinder and therefore a man who wont shout at her when he has a shower.
That seems very odd. Do you mean that the siren would not work even if/when the video senders were not in use? If so, even if some external influence had some immediate effect on the siren, it should not have any lasting effect - so I think the primary problem must have been with your alarm siren, not any interference it was subjected to.
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