I thought the idea of a heart shaped breeder for valentines day is endearing.
It is a given that designing around a large shape requires inefficiency, as more uranium leave less space for plating, and extra cooling leaves less space for plating.
Given that, I wanted to see if I could design that preserves a heart shape without giving up too much in efficiency.
63.7 bred / U isn't terrible, it's around 70% of maximal. You will need more than 3 double chests full of isotopes to feed it per cycle.
I'm not going to use it to breed, but if you want a heart in your reactor, that is how I would do it.