Solar Thermal Market Size, Share & Industry Analysis, By Collector Type (Evacuated Tube Collector, Flat Plate Collector, Unglazed Water Collector, Air Collector), By Type of System (Thermosiphon Solar Heating Systems, Pumped Solar Heating System) By Application (Domestic Hot Water Systems, Large DHW Systems, Solar Combi Systems, Swimming Pool Heating, Others), and Regional Forecast, 2019-2032