i can only speak for the s9 space heater experience, which even with a 3d printed case is kindof an eyesore and certainly takes up more space than the avalon. i think the avalon isnt going to be a serious source of heat. the s9 will legitimately heat a common area in an apt for example easily, whereas the nano i think maybe could keep ur feet warm under a desk just based on what ive read about it. the s19 never gone that route seems pretty difficult to reasonably run that in ur house due to electricity demand, noise and size.