For a tank style heater household size is a simple indicator of hot water needs.
Water tank size for family of 4.
For example think about how.
This tank size based on the scenario in step 2 is adequate for the peak hourly hot water.
With these two figures combined with your catchment area and water usage we can now calculate the optimum size for a water tank to suit your needs.
For an instantaneous hot water unit servicing two water saving shower heads you would need a hot water heater with a flow rate of at least 16l min.
If your family size is 5 or more you ll need an 80 gallon tank electric or a 50 gallon tank natural gas or liquid propane.
Storage tank hot water heaters are sized based on btu input and capacity in gallons.
You can estimate the necessary tank capacity in gallons based on the number of people in the house.
Again the more you rely on hot water on a regular basis the more btus and capacity you ll need.
Choose a hot water heater with a tank size in the range of 50 to 60 gallons on the fhr label.
1 or 2.
Taking a 4 person household for example located in rural victoria with 452 litres usage a day and an average roof area of 200m2 we can head over to the alternative technology association s tankulator tool.