🚀 go-pugleaf

On Thu, 15 Jul 1999 21:02:45 +0100, "Luke Briner"
<lukeb@DONT-SPAM-MEeasynet.co.uk> wrote:

>>Heat exchangers should be installed in the U-bend outlets under the sink
>and
>>the bath so that when you let the dirty hot water out into the grey-water
>>tank, the heat is extracted and returned to where it is needed.
>
>Very cunning idea. The other more efficient alternative is to have water
>waste pipes
>fed around the walls of the house (and the bath etc upstairs) so that as the
>water runs
>out the walls are heated directly. If it is planned properly then all the
>warm water stays
>inside the walls for a good few hours until the next waste water is pushed
>through.
>Essentially a large U-bend around the wall cavity.
>
I'm not quite with this one .  What is efficient about heating the walls in
the summertime ? The waste heat needs to be directed to the hot water tank
really, but your system is simpler and that may count for more.