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Old 01-11-16, 02:22 PM   #9
Apprentice EcoRenovator
Join Date: Jul 2014
Location: Finland
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I have never replaced the anti-freeze as such. On occasion I have changed the plumbing around a bit and have topped it up then, but I have no good measure of its strength. All a bit disorganized really.

How often should I replace the anti-freeze?

There has been no damage caused by the freeze. By pure chance I caught it before it froze too hard, and thawed it out. (Today was warmer anyway (-15C) so no repeat problem). I happened to be checking the system because of the GSHP problem, plus it was the first bit of sun for ages and I was hoping for a significant contribution from the solar panels.
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