Well I'm mining conflux [0] not bitcoin.

And yeah that does seem to be "profitable". A 2070 Super card seems to net me a couple of bucks a day...enough to offset the cost. Probably not profitable in the true sense, but hey free heating is a win for personal finances.

[0] https://confluxnetwork.org/

It's done with ASICs these days but the general idea of using the waste heat still holds.