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There is no leak from the pressure relief valve. Water does exit the boiler from the condensation pipe, and at one point there were signs of radiator anti-freeze in this water.

I have a problem with loss of water from the radiator circuit, which has to be topped up every few days. There are no visible leaks of course. I was suspecting the expansion vessel, however ... Am I right in assuming that, when it is running normally, the air pressure that I measure in...