| 2019 | [
  #<Node buildings_space_heater_coal>,0
  #<Node buildings_space_heater_collective_heatpump_water_water_ts_electricity>,1
  #<Node buildings_space_heater_combined_hydrogen>,2
  #<Node buildings_space_heater_crude_oil>,3
  #<Node buildings_space_heater_electricity>,4
  #<Node buildings_space_heater_heatpump_air_water_electricity>,5
  #<Node buildings_space_heater_heatpump_air_water_network_gas>,6
  #<Node buildings_space_heater_heatpump_surface_water_water_ts_electricity>,7
  #<Node buildings_space_heater_hybrid_crude_oil_heatpump_air_water_electricity>,8
  #<Node buildings_space_heater_hybrid_heatpump_air_water_electricity>,9
  #<Node buildings_space_heater_hybrid_hydrogen_heatpump_air_water_electricity>,10
  #<Node buildings_space_heater_network_gas>,11
  #<Node buildings_space_heater_solar_thermal>,12
  #<Node buildings_space_heater_wood_pellets>,13
] | nodes | 
| 2050 | [
  #<Node buildings_space_heater_coal>,0
  #<Node buildings_space_heater_collective_heatpump_water_water_ts_electricity>,1
  #<Node buildings_space_heater_combined_hydrogen>,2
  #<Node buildings_space_heater_crude_oil>,3
  #<Node buildings_space_heater_electricity>,4
  #<Node buildings_space_heater_heatpump_air_water_electricity>,5
  #<Node buildings_space_heater_heatpump_air_water_network_gas>,6
  #<Node buildings_space_heater_heatpump_surface_water_water_ts_electricity>,7
  #<Node buildings_space_heater_hybrid_crude_oil_heatpump_air_water_electricity>,8
  #<Node buildings_space_heater_hybrid_heatpump_air_water_electricity>,9
  #<Node buildings_space_heater_hybrid_hydrogen_heatpump_air_water_electricity>,10
  #<Node buildings_space_heater_network_gas>,11
  #<Node buildings_space_heater_solar_thermal>,12
  #<Node buildings_space_heater_wood_pellets>,13
] | nodes |