Hot Water Energy Calculator
Compare annual running costs between different hot water system types and see how much you could save by upgrading.
Hot Water Energy Calculator
Compare the annual running costs of different hot water system types and see how much you could save by upgrading.
Efficiency factor compared to standard electric
Percentage of tank used daily
Perth average is ~$0.29/kWh
Perth average is ~$0.035/MJ
Older systems lose efficiency
Estimates based on typical usage patterns and current Perth energy rates. Actual costs depend on your specific usage, tariffs, and system efficiency. Contact us for a detailed assessment of your potential savings.
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08 7666 2806Hot Water System Running Cost Comparison
| System Type | Efficiency | Annual Cost* | 10-Year Cost |
|---|---|---|---|
| Electric Storage | Baseline | $900-$1,200 | $9,000-$12,000 |
| Electric (Off-Peak) | 15% cheaper | $750-$1,000 | $7,500-$10,000 |
| Gas Storage | 40% cheaper | $500-$700 | $5,000-$7,000 |
| Gas Instantaneous | 55% cheaper | $400-$550 | $4,000-$5,500 |
| Heat Pump | 75% cheaper | $200-$350 | $2,000-$3,500 |
| Solar + Booster | 80-85% cheaper | $150-$250 | $1,500-$2,500 |
*Based on a 3-4 person household with average usage in Perth. Actual costs vary based on usage, tariffs, and system efficiency.
Factors That Affect Running Costs
System Age
Hot water systems lose efficiency over time. A system older than 10 years may be using 20-35% more energy than when new. Factor this into your replacement decision.
Tank Size vs Usage
An oversized tank wastes energy heating water you don't use. An undersized tank means running out of hot water. Proper sizing is essential for efficiency.
Climate Impact
Perth's warm climate is ideal for heat pumps and solar systems. Heat pumps perform best in temperatures above 10°C - perfect for our mild winters.
Standby Heat Loss
Storage tanks lose heat over time. Well-insulated modern tanks and proper installation can minimise this waste. Instantaneous systems eliminate standby loss entirely.
Want to Know Your Exact Potential Savings?
Our free assessment includes a detailed analysis of your current system's efficiency and specific recommendations based on your usage patterns.
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