Hot Water Savings Calculator
Compare running costs and find out how much you could save by upgrading your hot water system.
Estimates based on WA average electricity rate ($0.29/kWh) and gas rate ($0.035/MJ). Actual costs vary by usage, tariff, and system efficiency.
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How the Calculator Works
energy_savings_leaf Energy Calculations
We calculate the energy required to heat your daily hot water usage based on household size. This accounts for heating water from cold (15°C) to storage temperature (60°C).
trending_up System Efficiency
Each system type has different efficiency ratings. Heat pumps achieve 350% efficiency (COP 3.5), while electric storage is 90% efficient. This dramatically affects running costs.
payments WA Energy Rates
Calculations use current Western Australian average rates: $0.29/kWh for electricity and $0.035/MJ for natural gas. Your actual rates may vary by retailer and tariff.
calendar_month 10-Year Analysis
We calculate payback periods and 10-year net savings to help you make informed decisions. This includes typical installation costs and annual maintenance.
Common Questions
How accurate is this calculator? expand_more
This calculator provides estimates based on typical system efficiencies and current WA energy rates. Actual costs vary based on your specific energy tariff, hot water usage patterns, system age and condition, and outdoor temperatures (for heat pumps). For a precise assessment, we recommend our free in-home evaluation.
Why are heat pumps so efficient? expand_more
Heat pumps don't generate heat directly - they move heat from the air into your water, similar to how a reverse-cycle air conditioner works. For every 1kWh of electricity used, a good heat pump can deliver 3-4kWh of heat energy. This makes them 3-4 times more efficient than direct electric heating.
Are government rebates included? expand_more
The installation costs shown are before any rebates. Heat pump and solar systems are eligible for STCs (Small-scale Technology Certificates) which can reduce costs by $500-$1,000. We handle all rebate paperwork and deduct the amount directly from your quote.
Should I repair or replace my system? expand_more
Generally, if your system is over 10 years old and the repair cost exceeds 50% of replacement value, upgrading often makes more sense - especially when you factor in improved efficiency and reliability. Our free assessment will give you honest advice on your specific situation.
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