| 2019 | [
  #<Node households_space_heater_coal>,0
  #<Node households_space_heater_combined_hydrogen>,1
  #<Node households_space_heater_combined_network_gas>,2
  #<Node households_space_heater_crude_oil>,3
  #<Node households_space_heater_district_heating_ht_steam_hot_water>,4
  #<Node households_space_heater_district_heating_lt_steam_hot_water>,5
  #<Node households_space_heater_district_heating_mt_steam_hot_water>,6
  #<Node households_space_heater_electricity>,7
  #<Node households_space_heater_heatpump_air_water_electricity>,8
  #<Node households_space_heater_heatpump_ground_water_electricity>,9
  #<Node households_space_heater_heatpump_pvt_electricity>,10
  #<Node households_space_heater_heatpump_surface_water_water_ts_electricity>,11
  #<Node households_space_heater_hybrid_crude_oil_heatpump_air_water_electricity>,12
  #<Node households_space_heater_hybrid_heatpump_air_water_electricity>,13
  #<Node households_space_heater_hybrid_hydrogen_heatpump_air_water_electricity>,14
  #<Node households_space_heater_network_gas>,15
  #<Node households_space_heater_wood_pellets>,16
] | nodes | 
| 2050 | [
  #<Node households_space_heater_coal>,0
  #<Node households_space_heater_combined_hydrogen>,1
  #<Node households_space_heater_combined_network_gas>,2
  #<Node households_space_heater_crude_oil>,3
  #<Node households_space_heater_district_heating_ht_steam_hot_water>,4
  #<Node households_space_heater_district_heating_lt_steam_hot_water>,5
  #<Node households_space_heater_district_heating_mt_steam_hot_water>,6
  #<Node households_space_heater_electricity>,7
  #<Node households_space_heater_heatpump_air_water_electricity>,8
  #<Node households_space_heater_heatpump_ground_water_electricity>,9
  #<Node households_space_heater_heatpump_pvt_electricity>,10
  #<Node households_space_heater_heatpump_surface_water_water_ts_electricity>,11
  #<Node households_space_heater_hybrid_crude_oil_heatpump_air_water_electricity>,12
  #<Node households_space_heater_hybrid_heatpump_air_water_electricity>,13
  #<Node households_space_heater_hybrid_hydrogen_heatpump_air_water_electricity>,14
  #<Node households_space_heater_network_gas>,15
  #<Node households_space_heater_wood_pellets>,16
] | nodes |