How does that work then. Have they rewritten the laws of physics.
800w in = 800w out.
1st law of energy. It can neither be created or destroyed - just transferred.
Typical heat pump, 800W in, 3200W out, COP of 4. Actual performance will depend on temperature differences etc.
My conservatory/sun room/whatever you want to call it at home is an infill between solid brick external wall and kitchen extension with triple skin plastic roof. I've recently put in new tiles to both it and the kitchen with electric heating mat underneath. Works a treat and most times I only need the floor slightly warm to keep me tootsies warm when I'm walking around barefoot!