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wrote:
Dave Liquorice wrote:
On 09 Jul 2005 12:30:17 GMT, Andrew Gabriel wrote:

Not that I really approve of dumping large amounts of heat
outdoors,

Neither do I. Maybe an option if the OP has the space is a small pump
(perhaps a solar powered) and lots of black hose pipe. On a day like
today there will be a considerable temperature rise in the water
flowing through the hose.
snip
Or the OP could buy ?90 worth of hosepipe, polythene & pump, and get
10kW with 1/10th the run cost of the 3kW heater.

Not a tough choice. Cheap pool solar heating is very easy to make btw,
probably easier than installing electric into the water.

Details?
10m^2 collector area, how does it work?
Polythene over hosepipe?