Wouldn't the same size glass spread over a larger solar collector (not focused) produce as much hot water without having to re- aim every three minutes?
If you want steam or looking for some sort of on demand you may be on to something.
Sometimes the answer is nothing
That's a very big dog. I think I want to go home now and hug this tiny ad:
October Rocket Mass Heater days! Wheaton Labs October 11-17
