I’ve been eyeballing the Avalon nano 3 myself. Not nearly as cool as the bitaxe but does provide ~3TH/s. My basement is freezing in the winter and early spring. Been needing a source of heat for some seedlings I want to start next year too, so two birds one stone. I do feel guilty supporting a big commercial miner however. I’m conflicted. 

 Well for not so much more money you can get the bitaxe if it's the one you value the most. I doubt it can provide an efficient source of heat, but even the 140 W/h of the Avalon won't be much help IMO.