If you went with say a 5-gallon unit, you'd probably never see the cold sandwich. But, if you go with a hot water recirculation system, you shouldn't, either. This can end up being much more convenient in the long run, and depending on how you set it up, provide hot water nearly everywhere nearly instantly so you don't waste it when waiting for a shower or filling a tub. Lots of brands out there. There are retrofit units that do not need a return line, but if you can add a return line, you minimize the (usually minor) complaints a retrofit system introduces. You can set the recirc system up as a demand one that only comes on when you ask it to, or put it on a timer, or let it run continuously. If you have access, you could add a dedicated return line, at least for the kitchen sink.