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If you have to top up your boiler all the time time you have a massive leek.
You need to find that first.
If she's losing pressure massively over a couple of days my first thought would be the drain off cock, they have a little rubber washer in them and since they are rarely used it's not uncommon for them to leak like hell when you do open them up.
Sorry to hear of your problems. I really miss the hot water tank I had in the flat, and even the expensive storage radiators. At this rental I have to run water for ever till it gets hot, and I've not had a bath since moving out in October!!! The water runs cold after a small amount of hot and it can never fill up for an ideal soak. I just hope I have better luck when I move into my own house, whenever that will be. And that is a combi boiler too. Never used them in my life, till getting here, and not keen on them.
Thank you Jazzi.
It just proves that modernisation is not always better.
I do miss my Hot water tank in the airing cupboard which got my clothes bone dry
Can't see any leaks but three radiators are quite old and cant turn the valve off it there is air in there
one important thing with pressurised systems (combi's) is they do need manually topping up after you bleed air from them. My dil kept saying hers was losing pressure, then said she'd bled some rads and didn't realise it needed topping up.
Turn boiler off let to go cold and then check all your rad valves for wetness.
Then if you can check all pipe joints.
Best to get the pressure back up and then check for leaks. If pressure left low or zero, the leak won't show.
If it only lasted a day last time it was topped up, then it has a reasonable leak, which should be showing.