Finished installation - free hot water! Need to tie the units down to the rooftop, but they're in near-final position. Solar recirc pump ordered that will run during day keeping the tank at max temp (way overkill, but...cheap). Total system cost about $500 vs. 15-1800 retail installed (w/80 gal tank - way overkill).
@FireMonkey 😎 👍🏿 nice work.
We had those for 20 years. They worked so well the system had to blend cold water into the hot when going into the storage tank.