State Solar WH Requirements eff Jan 1 2010

[john the architect]

My concern is that thermosiphon solar heaters will be understood to be a viable and more affordable alternative (although requiring proper conceptual design from the start). The current design of systems that qualify for the Heco rebate are the complicated "active" systems with mechanical pumps and controls beyond the necessary valves and shut-offs.
Has the County mandated any design standard for the solar water heaters?