Fred Hopman, the president of the Taos Solar Energy Association, received a now-expired patent for his "self-insulating water wall," a big improvement on the water walls in the Sherer house. Scroll down and click on "view patent images" (after registering, damnit). This compact, inexpensive absorption/storage/distribution unit tested very efficient but to my knowledge has never been used in a building! Please let me know if I can help you get one built: evan (at) voted #1 for the next President's agenda:
Evan Ravitz, founder 303-440-6838
Iridescent Clouds, Boulder
"Fool's gold exists because there is real gold." -Rumi