there have been posts about this before. Those that tried it mentioned installation can be a real bear and the quality of the fittings leaves something to be desired.
If it could be hidden behind the shower wall that would be nice.
Based on the location of our shower vs the hot water tank, and my experience of how long and how much it takes till I get hot water, it would save less than a quart of water. Adds up, but I'd like a better implementation of the solution before I went for it.
2011 Keystone Outback 295RE
2004 14' bikehauler with full living quarters
2015.5 Denali 4x4 CC/SB Duramax/Allison
2004.5 Silverado 4x4 CC/SB Duramax/Allison passed on to our Son!