I do wonder - is it like a car where despite it being a closed system, you still need to top it up ?
My system is a year old and I can see the level is about 0.4 of an inch lower:
There isn't a leak or something that I can see so just wondering if that is expected / normal.
Thanks.
My system is a year old and I can see the level is about 0.4 of an inch lower:
There isn't a leak or something that I can see so just wondering if that is expected / normal.
Thanks.