This diagram shows the flow of energy from 100 kWh of heating energy. 30 kWh is converted to mechanical energy, with 70 kWh remaining as residual heat or renewable energy. There are heat losses of 14 kWh from exhaust gas, resulting in 60 kWh of primary energy and 54 kWh of usable renewable energy.

1. 18 kWh heat
28 kWh losses
residual heat (exhaust gas)
potentially
usefull
76 kWh
primary
30 kWh mechanical energy energy
100 kWh
heating energy
70 kWh
renewable
energy

2. 14 kWh heat
losses
(exhaust gas)
60 kWh
22 kWh residual heat primary
100 kWh heating 30 kWh mechanical energy
24 kWh mechanical energy energy
energy
54 kWh
renewable
energy