Despite its prediction over two decades ago, the detection of faint, high-temperature (\hot") emission
due to nano are heating in non- aring active region cores has proved challenging. Using an e cient
two- uid hydrodynamic model, this paper investigates the properties of the emission expected from
repeating nano ares (a nano are train) of varying frequency as well as the separate heating of electrons
and ions. If the emission measure distribution (EM(
T
)) peaks at
T
=
T
m
, we nd that EM(
T
m
) is
independent of details of the nano are train, and EM(
T
) above and below
T
m
re ects di erent aspects
of the heating. Below
T
m
the main in uence is the relationship of the waiting time between successive
nano ares to the nano are energy. Above
T
m
power-law nano are distributions lead to an extensive
plasma population not present in a monoenergetic train. Furthermore, in some cases characteristic
features are present in EM(
T
). Such details may be detectable given adequate spectral resolution and
a good knowledge of the relevant atomic physics. In the absence of such resolution we propose some
metrics that can be used to infer the presence of \hot" plasma.