Ran a small experiment this morning.
Our heat storage tank holds 1,260 us gallons the hot water tap was run at a flow rate of 1.3 us gallons per hour for 1 hour and in that hour the storage temperature of the tank dropped from 168 degrees to 161 degrees,roughly a consumption of 80,000 BTU'S per hour for 80 gallons of hot water or 1,000 BTU,S for one gallon of hot water!
Our heat storage tank holds 1,260 us gallons the hot water tap was run at a flow rate of 1.3 us gallons per hour for 1 hour and in that hour the storage temperature of the tank dropped from 168 degrees to 161 degrees,roughly a consumption of 80,000 BTU'S per hour for 80 gallons of hot water or 1,000 BTU,S for one gallon of hot water!
