In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Elegantly Simple Heat Pipe Design
Does anyone have any first hand experience with "all glass heat pipe evacuated tube collectors"?
Since there is no copper, these must be very low cost.
I would expect some thermal shock problems... but...
Usually they are inserted into an unpressurized storage tank.
Superinsulated Passive solar house, Buderus in floor backup heat by Mark Eatherton, 3KW grid-tied PV system, various solar thermal experiments