ESIE13-02
Functionality
31
Part 1 – System Outline
3
1
4
5
Economic
When the heat pump operates at the break-even COP, the cost of 1kWh thermal output produced by
the heat pump is equal to the cost of 1kWh thermal output produced by the boiler. The break-even
COP is dependent on the electricity price [€/kWh], the gas price [€/kWh] and the boiler’s thermal
efficiency [%] (considered as a fixed value, independent of flow temperature, return temperature and
ambient temperature). The energy prices are set by the user or installer and can be adjusted.
Ecologic
When the heat pump operates at the break-even COP, the primary energy use to produce 1kWh
thermal output by the heat pump is equal to the primary energy use to produce 1kWh thermal output
by the boiler. The break-even COP is dependent on the Primary Energy coefficient (the amount of
primary energy input that is needed to generate a kWh of electricity, here assumed to be 2,5) and the
boiler’s thermal efficiency.
COP
Break-even,
ECONO =
Electricity price
kWh
x
boiler
Gas price
kWh
COP
Break-even,
ECO =
x
boiler
