alt.energy.renewable

daestrom wrote:

>> >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?

97.

>So with a float switch it would run only /97*24= ~16 hours a day
>and use just 1368 watt-hours a day?

Yes, but maybe it's better to turn down the flow rate and run it
"continuously" (with a 10 min cycle time and a 6 min on-time) which
would still use 1368 Wh/day but make the heat exchanger more efficient.

>Seems a bit much (about $ worth of electricity a day).

Yes... Btu of electric water heating is kWh/day.

Maybe we should find a more energy-efficient pump, or centrifugally pump
the graywater up to a bucket above the sewer outlet and let it drip back
down through the outer tubing, then back up the outer tubing to the outlet.

Nick