The cost of Electricity in Spain is really very expensive.......

please don't bother posting if you cannot be polite.there is no need for rudeness

Don't bother counter posting with me then, deal or not. 

a heat exchanger uses mainly sunlight,

I thought a heat exchanger basically scavenged heat from one source  and exchanged it with a liquid which is then used to heat, say the pool or cool, say a refrigerator.  That being so,  that it is in direct sunlight would seem to make little difference, as the air would be more or less the same temperature.  

That is of course unlike a solar water heater, which I have,  which fundamentally require direct sunlight.    If that, and not a heat exchanger,  were being used to heat the pool, then it would need to be in direct sunlight.

Or have I got it wrong ?

The pool water passes through a tank in the heater unit, if the tank heats up by sunlight the thermastatically controlled top up does just what is says on the box in topping up to the chosed temperature. Obviously if someone wants clouds of steam emanating from the pool then the costs will soar, you have the best system in solar, it must be great in winter.   

Thanks for all your views and comments I suppose I must suffer on.....I love Spain so much and would hate to sell out and leave, In Spain my car cost's €50 to tax or Suma in Ireland it is €570 so that helps a lot I suppose.......

It's swings and roundabouts, certain foodstuff is very reasonable in Spain, particularly pork, chicken and fruit and veg, a bottle of Campo Rioja costs around €4.00 in Spain as against £11.00 in the UK and petrol and diesel is still cheaper in Spain.

Please be polite all times. If you don't like a particular post either comment in a civil manner avoiding insults and abuse at all times or don't reply to it. If you find it personally offensive please report it.