GO  GREEN...

comparing water heating alternatives (June '09 - source REBAC)

Type                        Unit Cost          Cost to install           savings            Back-up needed?

Conventional         $200-800         low                         n/a                        no

Demand/Tankless   $800~1,200      medium to high        Elec: 10-20%           maybe

                                                                                               Gas: 20-40%

Solar                    $1,000~5,500   high                       60-95%                  maybe

Heat Pump            $600-2000        medium                  60-70%                   maybe

=====================================================================

also visit: http://www.energystar.gov

                http://infinitepower.org/calc_water.htm

State tax credit :

http://www.dsireusa.org/incentives/index.cfm?re=1&ee=1&spv=0&st=0&srp=1&state=HI              

US Department of Energy Efficiency and Renewable Energy: http://www.eere.energy.gov/