I love showers. I love long showers. Let's say I take an "hour power shower".

With that in mind I've been thinking of installing a heat recovery drain system for an upstairs shower. I'm currently thinking of "Power Pipe" but I'm sure there are others.

First, does anyone here have any experience with these good or bad. And second: Typically one would install this in line with the cold supply for the hot water tank but since my tank is a good distance from where the heat recovery unit would be, it would be simpler to install this in line with the showers cold supply. I'm not sure if I would need a fancy mixing valve to make this feasible. Any thoughts?

Thanks.