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Hi Terry thanks for replying, I was struggling to find any info online
If your ev is present and has 2l of water in, losing 1l of water causes the ev to have 1l left but the system will still be full (assuming sufficient size ev and correct pressurisation)
Not if there is water in the vessel and the pressure is higher than the height of the system. The water will be replaced by water from the vessel.Justvone if the points I was trying to make above is that if your system loses water it will be replaced by air at the highest point of the system
Of course, that's why I said if the system loses any water. In your case you didn't so it was ok, but if you lost 1l of water there would have been 1l of air at the top of your upstairs rads.When I go to a system and replace an expansion vessel in a boiler on the ground foot I drop the pressure out of the system, disconnect the vessel, the system now has no vessel let alone an incorrectly charged vessel
My rads on the top floor do not suddenly become dry ? They are still full of system water
If your ev is present and has 2l of water in, losing 1l of water causes the ev to have 1l left but the system will still be full (assuming sufficient size ev and correct pressurisation)