4 ms·Wouldn't it be easier to just submerge some big heat exchanger?by cm2187 2y agoWouldn't it be easier to just submerge some big heat exchanger?Faaak 2y agoAt the end of the day, you're still wasting heat whereas you could heat a whole district with it.cm2187 2y agoBut the point is that it is passive and works all year long, which I suspect wouldn't be the case of a residential heating system.