[Greenbuilding] GFX Drain Waste Heat Recovery

[Alan Abrams]

Dr V--

Imagine a 40 yr old 250 unit 18 story high rise with, oh, say, maybe 25
stacks that are at least 6" diameter by the time they get to the garage
ceiling, maybe some of them running horizontally for a ways to join with
others--into who knows, maybe 15 stacks that take it below grade...many of
them quite a ways from the water heater.  Of course no way to synch the
preheat circuit with any given shower, but you know two or three hundred
peeps are gonna take a shower between 6-8 am every day...

Is it madness to take this thought any farther?

-Alan Abrams