I’m going to push back on this with a simple example. Go to your local hardware store and check out the electric space heater section. There will be a wide vari

I’m going to push back on this with a simple example. Go to your local hardware store and check out the electric space heater section. There will be a wide variety of units rated for small rooms, medium rooms, and large rooms, based on square footage. The heaters will have a variety of form factors and physical dimensions. Many of them will have mentions of “eco” and “efficiency”. Every single one of them, and I mean literally, will be a 1500W heater (or whatever your region’s equivalent maximum load per plug is which may vary in 240v countries). Exact same wattage, all 100% efficient because their only job is to produce heat, with wildly different dimensions and text on the box. Customers will swear up and down about the difference between these units.