Labels for solar thermals in buildings should be updated

[mabijkerk]

For buildings, solar thermal panels cannot supply 100% of hot water demand (as for households), but at most 13% of space heating demand. See the input statement buildings_space_heater_solar_thermal_share:

# Solar thermal panels can provide a maximum of 13% of year heat demand. Setting slider at 100% means that 13% of heat demand comes from solar thermal and 87% from the main heating technologies in buildings.

- query =
    EACH(
      UPDATE(EDGE(buildings_space_heater_solar_thermal, buildings_useful_demand_for_space_heating_buildings_present), share, (USER_INPUT()*0.13)/100.0),
      UPDATE(EDGE(buildings_space_heater_solar_thermal, buildings_useful_demand_for_space_heating_buildings_future), share, (USER_INPUT()*0.13)/100.0)
      )

The frontend of the Space heating section for buildings however has the following structure:

There are two issues here:

• The group label states "space heating and hot water" for the solar thermal panels, which in this case is applied incorrectly and should be fixed
• There should a label stating "of potential" for the solar thermal panels in addition to the "% of heat demand" label, to clarify to user that they do not apply to the total heat demand