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Greater Brisbane

Household hot water usage estimator

What this calculator answers

Estimate whole-household daily hot-water demand at the accepted 60 °C-equivalent basis. The estimate covers showers, baths, ordinary taps and any relevant appliance connections that are explicitly selected.

Useful to have ready

  • Typical shower and bath habits for the whole household.
  • Whether the dishwasher or washing machine uses the household hot-water supply.
  • An optional postcode or the supported council area for the property.

Before calculating

This is a modelled household planning estimate, not a measured result. After submission, the accepted whole-household estimate can be passed to Hot Water Cost.

Covers Brisbane, Logan, Ipswich, Redlands and Moreton Bay. No account is required and entries are not saved to a profile. Results appear only after the calculate button is selected and are planning estimates, not personal advice or a quote.

Est. litres/daySubmit to estimate
Greater Brisbane only

Household details

Adjust the inputs, then submit or recalculate to refresh the result.

Location and supported region

Choose the supported council area. A postcode is optional and can help confirm the region.

Brisbane, Logan, Ipswich, Redlands, Moreton Bay council areas.

Household use and demand

Describe normal household habits. Appliance questions have no preselected answer.

People in the household (1–20). Drag the slider for the common range, or click the number above to type a value above 8.

m

Whole minutes from 0–30, per person per day. The estimate uses a 9 L/min WELS 3-star planning flow; the shower label may differ.

Whole-household count from 0–14 per week. Uses a 130 L planning allowance; bath size and fill level vary. This count is not multiplied by household size.

Appliance hot-water connections

Answer each question independently. Many appliances heat cold water internally, so appliance-label water totals are not automatically household water-heater demand.

Is the dishwasher connected directly to the household hot-water supply?
Does the washing machine have a connected hot-water inlet that it uses?

Review and estimate

Check the answers above, then submit explicitly to create or refresh the estimate.

No account is required, and calculator inputs are not saved to a user profile. Replace any number with a more accurate household estimate.

Estimate hot water use
Complete the form, then select Estimate hot water use to see the results.
Results will appear after the form is submitted. Each figure uses the submitted details and Greater Brisbane cold-water inlet data.

Greater Brisbane scope

The estimator covers the Greater Brisbane council areas: Brisbane, Logan, Ipswich, Redlands, and Moreton Bay. Cold-water inlet temperature defaults are calibrated to those areas; other regions will diverge from the published figures.

Estimates, not recommendations

We do not recommend any particular hot water system, product, brand or installer. Results combine your inputs with disclosed sourced values and planning assumptions. If you want a running-cost estimate for a specific system, use the cost calculator — this page is the demand-input step.

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