Global Electric Baseboard Heater Market Size, Share & Demand Report By Product Type (Standard Electric Baseboard Heaters, Hydronic Electric Baseboard Heaters, Smart Electric Baseboard Heaters, Portable Electric Baseboard Heaters), By Application (Primary Space Heating, Supplemental Zone Heating, Retrofit Heating Applications, Temporary and Emergency Heating, Energy-Efficient Building Heating), By End User (Residential, Commercial, Industrial & Utility Buildings), By Distribution Channel (Offline Retail, HVAC Specialty Stores, Electrical Equipment Dealers, Home Improvement Stores, Online Retail & E-Commerce Platforms), By Region & Segment Forecasts, 2026–2031