I just read a blurb about heat recovery drain systems for shower drains. n particular thhe GFX. It said they are installed veritcally. Does anyone know about these and can they be installed horizontally??
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Why don't you ask the company about the second question. I'd assume they have an email address on their web site.
There have been some discussions of this on Breaktime in the past. Here is a repeat of what I said a couple of years ago:
Here is a picture of a drain heat recovery system. However it is hard for me to believe that the device is as effective as claimed in the accompanying text:
http://oikos.com/esb/49/gfx.html
And articles:
http://www.toolbase.org/techinv/techDetails.aspx?technologyID=168
http://www.eere.energy.gov/consumer/your_home/water_heating/index.cfm/mytopic=13040