One of the most common questions Melbourne homeowners ask is whether gas or electric hot water is cheaper. The answer depends on several factors specific to your situation, but here’s a comprehensive breakdown to help you decide.

Running Cost Comparison

Based on current Victorian energy prices, the typical ranking from cheapest to most expensive to run is:

1. Heat Pump — Lowest running costs
2. Gas Instantaneous — Very efficient, only heats when needed
3. Gas Storage — Affordable to run
4. Electric Storage (off-peak) — Competitive with off-peak tariffs
5. Electric Storage (continuous) — Highest running costs

Why Gas Usually Wins on Running Costs

Natural Gas Rates

Victorian gas prices, while increasing, remain lower per unit of energy than electricity. This makes gas hot water systems approximately 30-40% cheaper to run than electric storage systems on continuous tariffs.

Instantaneous Efficiency

Gas instantaneous (continuous flow) systems only heat water when needed, eliminating standby heat losses that affect storage tanks.

When Electric Makes Sense

Off-Peak Tariffs

If you have access to off-peak electricity rates (typically overnight), electric storage systems become more competitive. The lower rates can reduce running costs by 40-50%.

No Gas Connection

Installing a new gas line is a significant upfront expense. If your property doesn’t have gas, electric or heat pump systems avoid this cost entirely.

Solar Power

Homes with solar panels can significantly offset electric hot water costs. Heat pump systems are particularly effective with solar, using 70% less electricity than traditional electric systems.

Upfront vs Long-Term Costs

Electric storage systems have the lowest upfront cost but the highest running costs. Heat pumps cost more to purchase and install but have the lowest running costs, often making them the most economical choice over 10 years. Gas systems fall in the middle for both upfront and running costs.

Over a 10-year period, the total cost of ownership (purchase + running costs) tends to be lowest for gas instantaneous and heat pump systems, despite their higher upfront investment.

Other Factors to Consider

Recovery Time

• Gas: Heats water faster
• Electric: Slower recovery, may run out during high usage

Lifespan

• Electric Storage: 10-15 years
• Gas Storage: 10-12 years
• Gas Instantaneous: 15-20 years
• Heat Pump: 10-15 years

Maintenance

• Gas: Annual servicing recommended
• Electric: Minimal maintenance
• Heat Pump: Annual check recommended

Environmental Impact

• Electric (grid): Higher emissions
• Gas: Moderate emissions
• Heat Pump/Solar: Lowest emissions

Government Rebates

Victoria offers rebates for upgrading to efficient hot water:

• Heat pump rebates (generous rebates available)
• Solar hot water rebates available
• Additional rebates for concession holders

These can significantly reduce the upfront cost of efficient systems.

Our Recommendation

For most Melbourne households:

1. Best Value: Gas instantaneous (if gas connected)
2. Best Budget Option: Electric storage on off-peak
3. Best Long-Term: Heat pump (especially with solar)
4. Best for Environment: Heat pump or solar

Need Help Choosing?

Every home is different. We can assess your situation and recommend the most cost-effective hot water solution for your needs.

Call 0407 756 172 for a free consultation.