Quite some time ago I posted about the ReTherm drain water heat recovery system.  It is a very cool system that uses the hot water going down your drain to heat the cold water going into your water heater.  Doing so reduces the amount of heat needed to heat your hot water.  Giving you a theoretical 30% reduction in heating costs.

Now a new product has come online called the EcoDrain.  I have to say that I like the looks of the EcoDrain better.  Also, from what I see, it appears that the EcoDrain heats the cold water going directly to your shower and it does not first send it to your water heater.  By doing this they see a potential energy savings of 40%.  A little more savings and a tidier mechanical makeup makes this a very cool product in my book.

So how does it work?

The EcoDrain™ is a small, easy-to-install device with no moving parts. The key to saving you money is the heat-exchange channels.

These flattened, sealed channels were developed to maximize the surface area of the heat transfer space and to create optimum flow turbulence in the outgoing waste water and incoming fresh water. The EcoDrain™ is installed directly in the shower drain line and features a double wall of separation between fresh and waste water to eliminate the possibility of mixing, plus an interior non-stick coating to prevent soap, hair or debris collecting inside.

Source:  EcoDrain