Apartment complexes 1 Apartment houses 1 District heating 1 Economic advantages 1 Heat storage 1 Hot water 1 Latent heat 1 Latent heat storage 1 Latent heat storage system 1 Machinery 1 Peak load shifting 1 Peak load shifting control 1 Phase change material 1 Phase change materials 1 Shell-tube heat exchanger 1 Shifting controls Storage (materials) 1 Tube heat exchangers 1 Water 1