Hello Peter,
nice to hear from you.
Yes, we are very happy about the ROOS system. It does its work perfectly, and our experience is indeed that the pool is around 6 degrees warmer than other pools. That is also the feedback that our pool maintenance person is giving us.
In April (as you know it had been a cold winter and cold spring in Spain) he told us that all his pools were around 21 degrees, whereas ours was between 26 and 27 degrees.
As from the middle of May our pool is always between 28°C and 31°C, which is perfect.
Best Regards"