How much hot water is needed for bath or shower?
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Waterheatertimer.org		 water consumption bathtub Regular bath uses 13- 15 gallons of hot water (20 gal water total)

Set water heater timer for 45-60 minutes for hot bath		 A water heater holds 30 / 40 / 50 / 60 / 80 gallons of hot water depending on size of tank. A fully heated 40 gallon tank gives you 2 baths and a shower at one time. 
water consumption shower Shower uses 6 - 8 gallons of hot water (10 gal water total)

Set water heater timer for 20-30 minutes for hot shower		 hot water consumption
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