Model
The S1255 is an inverter-driven ground-source heat pump that adapts capacity to demand. That's exactly why an overly high heating curve is especially costly here — the unit simply keeps running quietly at a higher level.
An inverter unit doesn't make loud noise or obvious faults if the curve is too high. The only sign is the electricity bill. So it's worth comparing consumption with the heated floor area and the previous season.
Heating curve offset, how often the hot water "luxury" cycle runs, the circulation pump's mode, and brine ΔT. Write down readings before and after any change.
It depends on the house. An estimated range for a well-set 150 m² house is typically 6,000–11,000 kWh per year including hot water, but this is only a guideline.
Auto mode is usually best. Using continuous mode without reason adds to electricity consumption.
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