alt.energy.renewable

On Aug 31, 2:25 pm, "daestrom"
wrote:
> wrote in message
>
> news:fb9ibt$nv7@acadia. ...
>
> > >The $185 Mec-O-Matic (love that name :-) D75 uses about = 86
> > >watts
> >>moving 75 gpd, so it might use 74 moving ...
>
> > Oops. It uses about 86 W moving 97 gpd, so it might use 57 moving .
>
> Are you saying it uses 86 W * 24 hours =>2064 watt-hours to move those 96
> gpd? So with a float switch it would run only /97*24= ~16 hours a day
> and use just 1368 watt-hours a day?
>
> Seems a bit much (about $ worth of electricity a day).
>
> daestrom

But what is the temperature of the greywater when it leaves the
building without a heat exchanger? Even with no fancy heat exchanger,
much of the heat of the shower drain water is given off by the drain
pipes in to the building environment. Also much of the inital heat is
given up in the shower itself heating the walls and evaporating the
water into vapor. I'm going to guess that the economics of this shows
that there is no payback.
Mark