Dr. Infrared 1500W Indoor/Outdoor Heater

Dr. Infrared 1500W Indoor/Outdoor Heater

Why are all (home) heaters rated at 1500W? Space Heater Nonsense - YouTube
TLDW: 1500W is the max power a single appliance can draw from a 20A circuit. Because of this the size and shape of the heater makes little difference in how well it heats a space.