Tyler has worked out a pretty simple heat exchanger to extract some of the heat from the shower water as it goes down the drain and use this heat provide some of the heat to the incoming shower water.
|The grey water heat exchanger is inside the ABS stack on the left. It joins the|
main stack on the right near the floor.
The grey water heat exchanger consists of a bundle of PEX pipes. The cold water on its way to the shower runs through this bundle of PEX pipes which are inside the gray water drain from the shower. So, the outgoing hot water draining from the shower transfers some of its heat to the cold water that is on its way to the shower.
|The bundle of PEX pipes ready to go into the drain pipe.|
|The bundle of PEX pipes being stuffed into the grey water drain stack.|
Be aware that in many places this single wall heat exchanger design would not meet code.
Tyler gives quite a bit of detail on the construction and performance of the heat exchanger -- all the details here....
Please leave any comments or questions in the comments section at the link above.
Also at the link above is some more information and DIY and commercial grey water heat exchangers.
April 3, 2014