System Sizes

System Sizes

On average you should estimate to have a capacity of 35L – 40L of water storage per person for a gas system and slightly more for electric.

However,  you are best to judge this on your own consumption patterns.

Please note that this does not always mean that for an average family size of 4 people you need to have 4 times the above rate (ie. 4 x 40L = 160L Storage), as it depends on when you are using the water. If you are using it throughout the entire day, it may mean that you never need to consume 160L in one go and therefore a smaller unit may suffice.

Requirements for electric storage hot water systems

Off-peak
Number of people Capacity (Litres)
1 – 3 160
2 – 4 250
3 – 6 315
5 – 8 400
Peak rate
Number of people Capacity (Litres)
1 25
1 – 2 50
2 – 3 80
3 – 5 125

Source: Choosing a hot water system, Sustainable Energy Authority Victoria

Requirements for natural gas and LPG hot water systems

Tank storage
Number of people Capacity (Litres)
1 – 3 90
2 – 4 130
3 – 5 170
4 – 6 200
5 – 9 260
Continuous flow
#outlets at one time Flow rate (Lt/min)
1 16
2 20
2 – 3 24
3+ 32
   

Source: Choosing a hot water system, Sustainable Energy Authority Victoria

Requirements for solar hot water systems

Number of people Hot water required (Lt/day)
1 – 2 120
3 – 4 200
5 – 6 300
Approximate storage tank size Collector area (m2)
180 2
300 4
440 6

Source: Choosing a hot water system, Sustainable Energy Authority Victoria

Popular Brands

Get 3 Quotes for Hot Water Systems Now!

* By submitting your request, you accept our Terms & Conditions and our Privacy Policy​.

Share your hotwater story and knowledge with us

This message is only visible to admins:
Unable to display Facebook posts

Error: Error validating application. Application has been deleted.
Type: OAuthException
Code: 190
Click here to Troubleshoot.