Do systems lose pressure after refilling?

vonsworld · 5 Dec 2020

Hi
I recently drained my combi boiler to fit a new radiator. After the refill everything is working fine and I can find no leaks, but the pressure has been dropping 0.1 bar overnight when it's cold.

Is this normal for the first day or two? I read that these boilers have an air vent, so perhaps it's been venting air after the refill which might explain it?

Thanks for your feedback
Robin

muggles · 5 Dec 2020

Yes, often just venting air

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Do systems lose pressure after refilling?

vonsworld

muggles

DIYnot Local

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