[Greenbuilding] Solar pre-heat system

[Sacie Lambertson]

All, much as it is vaguely interesting to read the debate between two
listers about the viability of something else, I continue to be interested
in a good response to the question of the best material for moving glycol
from a solar heated panel ultimately to a water heater for the purpose of
preheating water.  Additionally, what is the best insulating material for
this tubing?    thanks,  Sacie