i just received a used "production Hot water solar panel" it is a couple of years old and needs a refurb... I am taking it apart and doing so... I am hoping to make some improvements and clone it several times to gain heat for the pool and then maybe expand the system to my hot water system... I appreciate your thoughts ( and your sons) will take all into consideration as my project develops.... Meanwhile I do have a real job (I run my own business) So this will take time... Thanks for the comments (I love building stuff)...