"dennis@home" wrote in message
o.uk...

"Roly" wrote in message
...

Presumably all this heat could be used for something useful like hot
water or a swimming pool instead of going to waste ?

Its pretty low grade.
but you could use it to preheat the water in a ho****er system, or a pool.
If you want to be green you can put it into a ground storage system and
extract it later when the weathers gone cold.
All of which cost money.

Whatever you do will cost money. The trick is to know what you are going to
pay, and make sure you can afford it. Can any of us say with any certainty,
what a litre of petrol, or a kilowatt-hour of electricty is going to cost in
ten years time?

-- JJ