Good luck with your search. A final piece of practical advice. If you are buying an old property to restore or looking to add a heating installation to an existing building try and find out what “potencia” ( current) is available in the electricity cable supplying your house. I have 25kw for my house. In France EDF just opgraded the meter but in many of the smaller towns in Spain the infrasructure is lacking. At the end of my project I had to pay an extra 10,000€ for a new cable which was then ceded back to Endesa and which I then had to pay to connect to!. I was told this was illegal but as they have an office block full of abogados I decided it was better to cough up and move on. This also happened to two Spanish friends of mine here one of whom received a very nasty bill.