It is numerically shown that the fast reconnection in a closed system gives rise to strong heating of a magnetic loop. The supersonic plasma jet resulting downstream of the slow shocks collides with the loop and is effectively converted into plasma heating by the fast shock standing in front of the loop. The heated plasma (by a factor of more than 10) is accumulated in the loop head and is finally distributed along the loop boundary. ¿ American Geophysical Union 1987