At my last evaluation, I had hoped that the solar heating effect at least. Meanwhile, I have to state that the quality is so poor that it's almost unwchtig whether the remaining water is warmer or not, however. Because the solar heater is leaking in countless places immediately after installation. The water splashes and flows in several places. And, although the four panels partly still sealed the winter in the attic have spent. Now unpacked, installed and immediately ... a fiasco. From this product can only advise. Material and processing are not worth a penny. Hands off.
