Allot 12 gallons of hot water per person in the household.
Water tank size for 3 bedroom house.
1 or 2.
Determine the number of hours of water consumption each day.
To see what size tankless water heater you need list the water devices.
For a tank style heater household size is a simple indicator of hot water needs.
New york state nys75 a.
So for a four bedroom house you d calculate based on having five people live there.
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.
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.
The fhr is always on the heater s yellow energyguide label but if you want to double check it yourself use the following formula and a four bedroom house as an example.
3 4 people you ll need at least a 50 gallon capacity tank.
The older version of this table permitted 750 gallon septic tanks in some.
If you re going with a storage tank water heater here s a rough guide for storage tank capacity.
Planning guide for water consumption.
Storage tank water heaters.
Wastewater treatment standards image update 12 january 2015 to current table that lumps 1 3 bedrooms together and adds 6 bedroom homes.
Agricultural and biological engineering fact sheet sw 1.
Sources of water use estimates.
For this example water consumption is between 7 00am and 9 00pm totaling 14 hours.
For example if you have a 50 litre l tank and use 75l per day you might assume that your tank would be too small.
1 2 people you ll need a water tank with at least a 30 gallon capacity.
The tank s volume does not need to be the same as how much it can deliver at once.
If water availability is projected to be insufficient for the calculated peak water demand additional sources must be developed or additional storage must be used see water facts 3 using low yielding wells.
Multiply this number by 12 gallons and that is the fhr.
If that 75l consists of using 25l of water 3 times throughout the day though the tank is in excess of what you require.
You can estimate the necessary tank capacity in gallons based on the number of people in the house.
2 3 people you ll need at least a 40 gallon capacity tank.
The current standard document is provided as a pdf and can be seen in its entirety at references.
So in a three bedroom home that has four people the fhr would be 48 gallons 4 12 gallons.
Notes to the septic tank sizing table above.
These calculations assume all bedrooms will be occupied and base the estimated water usage on this data.
