[Greenbuilding] whole house DHR retrofit

Rob Dickinson robd at pobox.com
Sat May 14 17:10:15 PDT 2011

Hi there,

Please share any responses you get with the list.

The only best practices on drainwater heat recovery that I am aware of, and
I got these from the recommendations of the manufacturers, is that you plumb
the pre-heated water from the drainwater heat recovery device to both the
cold inlet for the hot water heater AND to the main shower that the device
is attached to.   That way, the pre-heated cold water -- which is warmer
than the normal cold water -- allows you to use less hot water to mix with
the "cold" to achieve the desired temperature output water.

Love to hear any other ideas and/or recommendations.


On Sat, May 14, 2011 at 4:07 PM, Haudy Kazemi <kaze0010 at umn.edu> wrote:

> Hello,
> Are there any "best practices" for whole house drain heat recovery (DHR)
> retrofits?  By whole house, I'm also including the basement drains that
> serve basement bathrooms and laundry.  Sometimes upper floors also drain
> into pipes that are embedded into the basement slab.
> Is a small catch basin + sewage sump pump that lifts the drain line to drop
> back through a DHR a viable solution?  This would ideally include a overflow
> bypass in case the sump pump fails for whatever reason.
> Any comments/opinions are welcome.
> Thanks!
> -hk
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