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Fill resevoir - Page 3

post #21 of 22
Fill to the top, with maybe a 5mm clearance, so the expelled loop air has somewhere to go. I fill it to the top, so I don't have to refill as often. Actually, I have not refilled it in over 2.5 years. It is about half full now. Will be breaking down the loop for a well needed clean next year.
 
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BitoHeaven
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post #22 of 22
It depends on if you have a vertical tube reservoir or horizontal and if you use a spout, so the water doesn't just splash back in.

I think its good to leave some air in, as it gives room for expansion of the fluid.
I suppose in practice the water doesn't get hot enough to noticeable expand though.

Also consider backflow when the system is turned off..
The water level will rise slightly in the reservoir, if the top of the reservoir isn't perfectly screwed down you could get a leak.
Also if your bleeding air out, and leave a port open on the reservoir, then backflow could potentially spill out of that port if its not sealed before you turn it off.

In my system, I have the water go about an inch over the top of the spout, with almost 2 inches of air above it.
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