Energy saving in the hot water system with low flow fixture

Dear All We would like to know whether EAp2 and EAc1, LEED NC Version 2009, allow to count energy saving in hot water system by using low-flow shower heads as the ASHRAE 90.1 Appendix G state that "Service hot-water usage can be demonstrated to be reduced by documented water conservation measures that reduce physical volume of service water required". Examples include low-flow shower heads. Such reduction shall be demonstrated by calculations". For example, the baseline flow rate of the shower head from WEp2 is 2.5. gpm. If we use the shower head with flow rate of 1.6 gpm. We can count energy saving for the hot water system from the reduced flow rate of 0.9 gpm. Thank you