For the record, my system contains 140 litres of antifreeze, giving protection to -18 deg. C. In a well designed system you would never expect to approach these temperatures. My own system has been in use through the last four winters and the return temperature to the ground loop has never fallen below -2.3 deg. C. Today, the return temperature is +0.5 deg. C.
I notice you say that the "brine" has been topped up with glycol. I don't think you would mix glycol with brine; surely you would use one or the other?
|Brine/Anti freeze needing repl...||CL - 24/01|
|Re: Brine/Anti freeze needing ...||David Hobbs - 2/02|
|Re: Brine/Anti freeze needing ...||CL - 4/02|
|Re: Brine/Anti freeze needing ...||David Hobbs - 11/02|
|Re: Brine/Anti freeze needing ...||CL - 11/02|