#94 - doesn't quite capture the story we are trying to tell.
#95 - we like this one, but it gives a "coolish" impression, and we are shooting for a "solar hot water" feel.
#96 - thank you for taking our suggestions into account, very nice use of the yin/yang, but after seeing several yin/yang concepts, it appears that it is difficult to convey the message of "solar hot water" through this symbol.
Thank you very sincerely for your entries. We are overwhelmed by the response!