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For Thermia ground-source heat pumps, besides the heating curve, the brine circuit's condition matters. An undersized or aged collector lowers the source temperature and therefore efficiency for the whole season.
If the brine inlet/outlet difference is consistently greater than 3–5 K, or the inlet temperature drops below zero by season's end, this can indicate an undersized collector or a circulation problem. We recommend logging these readings and having a specialist assess them.
A ground-source heat pump's advantage shows at a low flow temperature. Shifting the Thermia curve down by one step and monitoring room temperature over a week is a safe first trial.
The collector itself is long-lived, but the ground's heat balance can deteriorate if the system is undersized. A low brine temperature at season's end is the indicator.
Typically 2–4 K. A significantly larger gap can point to too low a flow rate.
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