Hot Water Cost
Estimate annual and monthly running costs for a selected hot-water system.
Hot-water planning for Greater Brisbane
Understand household hot-water use, running costs and possible savings
Independent planning estimates for households in Brisbane, Moreton Bay, Logan, Ipswich and Redlands.
Start with household demand, or open a specific calculator when the required information is already available.
Recommended starting point
Estimate household hot water use
Build a whole-household daily demand estimate from showers, baths, taps and connected appliance use. The submitted litres can continue into running-cost and payback calculations.
Estimate household hot water use- Whole-household demand is shown before energy costs are estimated.
- Appliance uncertainty remains visible when a connection is marked “Not sure”.
- No account or saved household profile is required.
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Rebates and STCs are outside calculator arithmetic. Use the final payable installation quote once, without deducting an included discount again. Check incentives and quote treatment.
Direct calculator access
I know which calculator I need
Open a calculator directly when the relevant household and energy information is already available.
Not sure which calculator to use? View the calculator guide.
Heat Pump Payback
Compare annual running-cost savings with the full installed cost of a heat pump.
Electric vs Gas
OptionalCompare the variable running costs of two system types using the same household demand.
Understanding the estimate
What the calculators can help explain
Results connect household demand, system efficiency and selected energy rates while keeping important assumptions and exclusions visible.
What the estimates can show
See how whole-household hot-water demand and system inputs affect modelled running costs, annual differences and indicative payback.
What can affect costs
Household use, tariffs, system type, site conditions and current assistance can all matter. Results are planning estimates, not quotes or recommendations.
Systems
Understand the main hot-water system choices
System type, efficiency, tariff and site conditions can change a result. Use the calculators for household-specific planning figures.
Identify and compare hot-water systems- Heat pump
- Uses electricity to move heat rather than create it directly. Upfront quote, available outdoor space, noise location and effective electricity rate.
- Gas-boosted solar hot water
- Roof collectors meet part of the thermal demand and a gas booster supplies the balance. Roof orientation and shading, gas supply, booster efficiency and maintenance.
- Gas storage or instantaneous
- Uses metered gas, with storage losses applying to tank systems. Gas usage rate, daily supply charges, existing connection and household demand.
- Electric storage
- Direct resistance heating with tank standby losses. General versus controlled-load tariff, tank size and circuit/timer compatibility. Rooftop PV is not numerically modelled.
Rebates and certificates
Check the incentive and the final quote
Eligible heat-pump and solar hot-water systems may qualify for federal Small-scale Technology Certificates (STCs). A supplier quote may already include a certificate discount.
Rebates and STCs are outside calculator arithmetic. Enter the final payable installation amount once. Do not deduct a discount already reflected in the quote.
Check current eligibility, programme status and quote treatment
Practical guides
Understand the decision behind the numbers
Hot-water use and running costs in Greater Brisbane
Turn household hot-water habits and bill rates into a running-cost estimate for Brisbane, Moreton Bay, Logan, Ipswich and Redlands.
Is a heat pump worth it? Running costs and indicative payback
Compare heat-pump running costs and full installed-cost payback with electric storage or gas, using explicit household and quote assumptions.
45 kg LPG bottles: hot-water costs and how long they may last
Calculate hot-water-only demand in 45 kg LPG bottle-equivalents, then separate refill prices, delivery, rental and avoidable charges.
Controlled-load hot water and rooftop solar: what to check before switching
Check the bill, circuit, retailer rate, operating schedule, daytime surplus, exports and alteration costs before changing controlled-load hot water.
Evidence and independence
Planning information with visible assumptions
Calculations use documented inputs, models and source records. Results remain estimates and should be checked against current tariffs, site conditions and professional quotes before a purchase decision.
About HotWaterWise and the complete methodology provide the deeper context.
- Coverage
- Launch calculations support Brisbane, Moreton Bay, Logan, Ipswich and Redlands. An unresolved postcode is not guessed and an outside postcode is blocked.
- Last updated
- The current shared model-review date is . Volatile evidence is reviewed quarterly and on material source changes; stable technical evidence receives an annual deep review.
- Methodology
- The accepted formulas, planning assumptions, exclusions and source records are published so the calculation can be checked. Read the full methodology →
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