What dT would be required for it to work ? Cheap peltiers I've seen can get up to 65-75 deg C and more expensive TEG cells can reach a dT of over 120 deg C, would this be comparable to a normal HP ? I've read some papers on peltiers and one paper claimed reaching a COP of 6-8 in a similar situation, what is the COP I can expect from a properly designed refrigeration cycle using an old AC unit? I'm just wondering why no one has really tried their luck at Peltiers yet; there might be some very sensible reasons not too of course.
A house drainwater project is not my cup of tea, I think I do not use enough water to justify such a big remodelling. I use about a 100m3 of water a year and after quickly crunching the numbers it wouldn't really make sense in my case. I do however like how far some people go in order to preserve energy !
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