Hey guys, questions about the correct piping for a HRU with a recirculation loop. I am going to run a hot water return line from the furthest fixture. Here is a diagram for the desuperheater piping: http://www.hotspotenergy.com/heat-re...thout%20TT.pdf

Question is where do I pipe the recirculation line back to the tank? Tee into the drain also with the hru using check valves? Would it be better to add pre-heat tank, and if so, would recirc line plumb into drain of "main" tank?

Thanks for your time