TERMIS can be downloaded in two different versions:

TERMIS performs network simulations and evaluates the effect in the network.

This free version comes with a demo example including simulation results available
for inspection via different plotting options (network plots, profiles and time series)
and dialogs. The demo license allows new hydraulic simulations for models including
up to 25 nodes.

The demo version will not allow you to save the changes just as not all menu
items are available.

TERMIS Operation is the next-generation district energy management operation tool.

The next-generation tool embraces your future system requirements and improves
the optimization of your network. The result is evident on your ROI. This free version
comes with a demo example including simulation results available

The demo version does not allow hydraulic simulations.