Does anyone have experience or pointers for cking out used flat thermal
panels? I'm planning a drain back system for domestic hot water and have
been keeping an eye out for some used panels. Now that I've found a few to
look at I'm wondering if there are any pitfalls to look for. So far the
more obvious things seem to be ck for leaks/ fit of glass / damage to the
case / broken fittings. What about the haze that appears on some of the
glass? is this normal or an indicator of a problem?
Thanks in advance