Average daily electrical energy use (kilowatt-hours per day, or kWh/day) for each month in the five years prior to installing the HPWH and for the five years after installation. YEAR MONTH ENERGY.USE DAYS 2008 august 640 30 2008 september 653 29 2008 october 776 31 2008 november 895 31 2008 december 922 33 2009 january read more Stone 2019 dataset