Cost Analysis
12 min read
Instantaneous vs Storage Tanks: What's Cheaper in NSW?
With NSW electricity prices at record highs and gas costs fluctuating, choosing between instantaneous and storage hot water systems has never been more critical. This detailed analysis uses real 2024 energy prices to show which system will save you the most money.
The Quick Answer for NSW Homes
Gas Instantaneous WINS
- • $400-600/year running costs
- • Unlimited hot water
- • 20+ year lifespan
- • Best for families 3+
Electric Storage IF...
- • You have solar PV system
- • Low hot water usage (1-2 people)
- • No gas connection available
- • Can access off-peak rates
NSW Energy Prices 2024: The Real Numbers
NSW Electricity Prices
Peak Rate (2pm-8pm):45-52c/kWh
Standard Rate:28-35c/kWh
Off-Peak (10pm-7am):18-22c/kWh
Daily Supply Charge:$1.20-1.50
NSW Gas Prices
Natural Gas Rate:2.8-3.2c/MJ
LPG (Bottled Gas):8-10c/MJ
Daily Supply Charge:$0.75-0.95
Conversion: 1 kWh = 3.6 MJ
Gas: ~10-11c/kWh equivalent
Gas: ~10-11c/kWh equivalent
Real-World Annual Running Costs: Average NSW Family (4 people)
| System Type | Energy Used | Energy Cost | Supply Charge | Total Annual |
|---|---|---|---|---|
| Gas Instantaneous (20L) | 4,500 MJ | $140 | $310 | $450 |
| Electric Storage (250L) | 3,800 kWh | $1,140 | $500 | $1,640 |
| Electric Off-Peak (250L) | 3,800 kWh | $760 | $500 | $1,260 |
| Electric + Solar (250L) | 1,900 kWh net | $380 | $500 | $880 |
Key Insights from Real NSW Data:
- Gas instantaneous saves $1,190/year compared to standard electric storage
- Off-peak electric saves $380/year vs standard electric rates
- Solar + electric can compete with gas if you have a large solar system
Detailed System Comparison
Instantaneous (Continuous Flow)
Heat water on-demand as you need it
✅ Advantages
- Unlimited hot water: Never run out during peak usage
- Lower running costs: No standby heat losses
- Space efficient: Compact wall-mounted design
- Longer lifespan: 20+ years vs 8-12 for tanks
⚠️ Considerations
- Higher upfront cost: $1,800-3,500 installed
- Gas connection required: Installation complexity
- Temperature fluctuations: During simultaneous use
Storage Tank Systems
Heat and store water in an insulated tank
✅ Advantages
- Lower upfront cost: $800-2,200 installed
- Consistent temperature: Pre-heated water ready
- Solar compatible: Works with solar heating
- Off-peak rates: Heat during cheap periods
❌ Disadvantages
- Higher running costs: Standby heat losses 24/7
- Limited capacity: Can run out during peak use
- Space requirements: Large tank footprint
- Shorter lifespan: 8-12 years typical (less in hard water areas)
Which System for Your NSW Home?
Choose Gas Instantaneous If:
- • Family of 3+ people
- • Existing gas connection
- • High hot water usage
- • Want unlimited hot water
- • Prefer lower running costs
- • Have limited space
- • Long-term investment focus
Savings: $810-1,190/year
vs electric storage
Choose Electric Storage If:
- • Single person or couple
- • No gas connection
- • Low hot water usage
- • Have solar PV system
- • Budget-conscious purchase
- • Access to off-peak rates
- • Emergency replacement needed
Cost: $880-1,640/year
depending on solar/off-peak
Hybrid Solution:
- • Solar + electric storage
- • Heat pump systems
- • Solar + gas backup
- • Best of both worlds
- • Higher upfront investment
- • Maximum efficiency
- • Government rebates available
Cost: $400-750/year
with rebates & optimal setup
10-Year Total Cost of Ownership (NSW Family of 4)
| System | Purchase + Install | 10-Year Running | Replacement | Total 10-Year |
|---|---|---|---|---|
| Gas Instantaneous | $2,500 | $4,500 | $0 | $7,000 |
| Electric Off-Peak | $1,500 | $12,600 | $1,500 | $15,600 |
| Electric Standard | $1,500 | $16,400 | $1,500 | $19,400 |
| Electric + Solar | $4,500 | $8,800 | $1,500 | $14,800 |
10-Year Savings with Gas Instantaneous:
- • $8,600 saved vs Electric Off-Peak
- • $12,400 saved vs Electric Standard rates
- • $7,800 saved vs Electric + Solar (including solar investment)
Installation Requirements & Costs
Gas Instantaneous Installation
Requirements:
- • Gas connection (natural gas or LPG)
- • Adequate ventilation clearances
- • Licensed gas fitter installation
- • Compliance certificates
Typical Costs:
- • 16L Unit: $1,800-2,400 installed
- • 20L Unit: $2,200-2,800 installed
- • 26L Unit: $2,600-3,500 installed
- • Gas connection: $1,500-3,000 extra
Electric Storage Installation
Requirements:
- • Adequate electrical supply
- • Space for tank installation
- • Licensed electrician installation
- • Electrical compliance certificate
Typical Costs:
- • 160L Unit: $800-1,200 installed
- • 250L Unit: $1,200-1,600 installed
- • 315L Unit: $1,500-2,200 installed
- • Electrical upgrade: $500-1,500 extra
Ready to Save Money on Your Hot Water Bills?
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Call 0420 102 207 for expert NSW advice orcalculate your savings