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I had the same thing on our old system. I bought some little sticky dots that turn red when they get wet - like they put inside phones etc to show water damage. Stuck em on each rad pipe below the valve - found the leak and fixed it. It was small and would dry out instantly due to the heat so almost impossible to find otherwise.
Better to find the cause than treat the symptom. Heating systems should not regularly loose pressure to the point of failure.
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Found this video quite informative.
My boiler is in the attic. Getting into the attic involves a ladder, which is a pain.
Over the winter, the pressure in my heating system slowly drops (God knows why, but I am told that this is quite normal?). This ultimately causes a low pressure failure and the boiler turns off.
The first I know of this is that the heating gets colder and then we have no hot water. And then I have to go up into the attic and repreasurise the system. Or worse, as happened last week, I am away and my ladder-averse other half has to suffer without heating or hot water until I get back.
So, my question is, is it possible to install a pressure guage and repreassurisation loop (like this one) somewhere else in the system, in a more convenient location?
I'd rather get a sense check if the idea here, before calling a plumber to do it...