Where NIBE savings usually hide
NIBE's control automation calculates the flow temperature from the outdoor temperature. If the curve was left at the installer's default, the pump often runs 3–7 °C higher on the flow side than the house actually needs. Every extra degree of flow temperature is estimated to add 2–3% to electricity consumption.
Another recurring spot is the domestic hot water temperature and how often "luxury" mode runs. If the electric immersion heater kicks in at the end of every hot water cycle, part of the heat pump's advantage is lost.
What to look at in the logs
On the NIBE display or in the NIBE Uplink history it's worth watching the number of compressor starts per day, the immersion heater's running hours, and the gap between flow and return (ΔT). A high number of starts on a low-load day can point to oversized capacity or too narrow a hysteresis.
Immersion heater running hours in mild winter weather are a clear sign that the curve or priorities need checking.
What we take into account for NIBE in the analysis
Our analysis compares your annual consumption with the heated floor area and heating system type, and looks for inconsistencies between temperatures, consumption and reported symptoms. The result is an estimate and does not replace a COP measured with a heat meter.