Gridly
28 Systems Ranked · Updated 2026
Best Heat Pump Hot Water for Replacing Gas Hot Water (Australia 2026)
Switching from a gas storage or continuous flow system. We ranked every heat pump hot water system in Australia for this specific use case, weighing COP efficiency as the primary factor.
Why Replacing Gas Hot Water Changes the Choice
Binding Constraint
Running cost savings vs gas, any efficient heat pump pays back, but R290 units with high COP offer the best savings
Almost any heat pump hot water system will save money over gas. The key metric is COP, a COP of 4.0+ means the unit produces 4kWh of heat per 1kWh of electricity. At current gas prices ($0.04-0.06/MJ) vs electricity ($0.30-0.35/kWh), a COP 4+ heat pump cuts hot water costs by 60-75%.
The average Australian household spends $600–$1,000 per year on gas hot water. Even a mid-range heat pump with a COP of 4.3 cuts that to $200–$350 per year on grid electricity. If you have rooftop solar, the running cost drops to near zero during sunny months. The economics are strongly in favour of switching — the question is which heat pump gives you the best long-term value for your specific situation.
Our Top Picks for Replacing Gas Hot Water
Solahart
Atmos Eco 280L
$3,500
Why it wins: COP of 5.2 means it produces 5.2kWh of hot water heat per 1kWh of electricity. Annual running cost of approximately $236 on grid power vs $700-900/yr on gas.
Enviroheat
200L
$2,000
Why it is good value: At $2,000, it is $1,500 less than our top pick while still meeting all the key criteria for replacing gas hot water. Eligible for state rebates to reduce the upfront cost further.
All Qualifying Heat Pumps for Replacing Gas Hot Water
28 heat pump hot water systems meet our criteria for replacing gas hot water. Sorted by COP (highest first).
| System | Tank | COP | Refrigerant | Noise | Min Temp | Timer | Price | Warranty |
|---|---|---|---|---|---|---|---|---|
| Solahart Atmos Eco 280L TOP | 280L | 5.2 | R290 | 45dB | -7°C | Smart Timer | $3,500 | 7yr / 3yr |
| Ecogenica R 215 | 215L | 5.0 | R290 | 50dB | -15°C | Smart Timer | $2,200 | 7yr / 5yr |
| Ecogenica R 290 | 290L | 5.0 | R290 | 50dB | -15°C | Smart Timer | $2,600 | 7yr / 5yr |
| Rinnai Enviroflo 250L | 250L | 5.0 | R290 | 48dB | -5°C | Smart Timer | $3,850 | 7yr / 3yr |
| Rinnai Enviroflo 315L | 315L | 5.0 | R290 | 48dB | -5°C | Smart Timer | $4,200 | 7yr / 3yr |
| Reclaim Energy CO2 250L | 250L | 5.0 | R744-CO2 | 37dB | -25°C | Smart Timer | $5,000 | 10yr / 6yr |
| Thermann 250L CO2 Split | 250L | 5.0 | R744-CO2 | 37dB | -25°C | Smart Timer | $5,223 | 10yr / 6yr |
| Reclaim Energy CO2 315L | 315L | 5.0 | R744-CO2 | 37dB | -25°C | Smart Timer | $5,500 | 10yr / 6yr |
| Sanden Eco Plus 250L | 250L | 5.0 | R744-CO2 | 38dB | -25°C | Smart Timer | $5,800 | 10yr / 6yr |
| Thermann 315L CO2 Split | 315L | 5.0 | R744-CO2 | 37dB | -25°C | Smart Timer | $5,800 | 10yr / 6yr |
| Sanden Eco Plus 315L | 315L | 5.0 | R744-CO2 | 38dB | -25°C | Smart Timer | $6,200 | 10yr / 6yr |
| Reclaim Energy CO2 400L | 400L | 5.0 | R744-CO2 | 37dB | -25°C | Smart Timer | $6,500 | 10yr / 6yr |
| Emerald All-In-One 220L | 220L | 4.9 | R290 | 49dB | -7°C | Smart Timer | $2,990 | 5yr / 5yr |
| Emerald All-In-One 270L | 270L | 4.9 | R290 | 49dB | -7°C | Smart Timer | $3,290 | 5yr / 5yr |
| Emerald All-In-One 320L | 320L | 4.9 | R290 | 49dB | -7°C | Smart Timer | $3,590 | 5yr / 5yr |
| iStore 270L | 270L | 4.8 | R290 | 46dB | -7°C | Smart Timer | $2,790 | 5yr / 5yr |
| Evoheat 270-E | 270L | 4.7 | R290 | 46dB | -7°C | Smart Timer | $3,600 | 6yr / 5yr |
| Rheem Ambiheat HDc270 | 270L | 4.5 | R513a | 48dB | -5°C | Mid-range Timer | $3,629 | 7yr / 3yr |
| Quantum 200L | 200L | 4.3 | R290 | 50dB | -7°C | Basic Timer | $3,000 | 5yr / 2yr |
| Quantum 270L | 270L | 4.3 | R290 | 50dB | -7°C | Basic Timer | $3,500 | 5yr / 2yr |
| Quantum 340L | 340L | 4.3 | R290 | 50dB | -7°C | Basic Timer | $4,000 | 5yr / 2yr |
| Thermastore Heatwave 270 | 270L | 4.3 | R290 | 46dB | -7°C | Mid-range Timer | $3,000 | 6yr / 5yr |
| Aquatech X6 225L | 225L | 4.2 | R290 | 42dB | -7°C | Mid-range Timer | $2,295 | 5yr / 5yr |
| Apricus APHP-R290-260 | 260L | 4.1 | R290 | 43dB | -7°C | Smart Timer | $3,500 | 5yr / 5yr |
| Stiebel Eltron WWK 222 | 222L | 3.9 | R134a | 45dB | -8°C | Basic Timer | $3,500 | 5yr / 5yr |
| Stiebel Eltron WWK 302 | 302L | 3.9 | R134a | 45dB | -8°C | Basic Timer | $4,000 | 5yr / 5yr |
| Enviroheat 200L VALUE | 200L | 3.9 | R134a | 46dB | -7°C | Basic Timer | $2,000 | 5yr / 1yr |
| Enviroheat 250L | 250L | 3.9 | R134a | 46dB | -7°C | Basic Timer | $2,200 | 5yr / 1yr |
Tank Sizing for Replacing Gas Hot Water
Match your tank size to your current gas system's output. If you had a 6-star gas storage system (135L-170L), a 250L heat pump tank is sufficient. For continuous flow gas replacing service to 3+ people, go 270L+. Heat pumps store hot water at higher temperatures than gas systems, so effective capacity is often greater than the litres suggest.
| Household Size | Daily Use (approx.) | Minimum Tank | Recommended Tank |
|---|---|---|---|
| 1 person | 50-80L | 160L | 200L |
| 2 people | 100-150L | 200L | 250L |
| 3 people | 150-220L | 250L | 270L |
| 4 people | 200-300L | 270L | 315L |
| 5-6 people | 300-400L | 315L | 340-400L |
Annual Running Cost Estimates
Based on a 3-person household using approximately 200L of hot water per day (10.5kWh thermal energy). Heat pump costs calculated using the COP of our top pick (Solahart Atmos Eco 280L, COP 5.2).
| Energy Source | Rate | Annual Cost | Saving vs Gas |
|---|---|---|---|
| Gas hot water (storage) | ~$0.05/MJ | $767 | - |
| Electric resistive | $0.32/kWh | $1,226 | +$459 |
| Heat pump (peak rate) | $0.32/kWh | $236 | $531 saved |
| Heat pump (off-peak) | $0.14/kWh | $103 | $664 saved |
| Heat pump (solar surplus) | $0.00/kWh | - | $767 saved |
Estimates assume 90% gas heater efficiency, COP 5.2 for heat pump calculations. Actual costs vary by location, usage patterns, tariff structure, and seasonal conditions. Solar surplus assumes 100% of heating occurs during solar production hours (practical savings are typically 70-90% of this).
Government Rebates for Heat Pump Hot Water
All 28 of the qualifying heat pumps above are eligible for government rebates, which can reduce the upfront cost by $700–$2,500 depending on your state. Federal Small-scale Technology Certificates (STCs) apply in all states.
Frequently Asked Questions: Heat Pumps for Replacing Gas Hot Water
How much will I save switching from gas to a heat pump hot water system?
Do I need to upgrade my switchboard when replacing gas with a heat pump?
Can I get rebates for replacing my gas hot water with a heat pump?
Ready to Switch to Heat Pump Hot Water?
Get obligation-free quotes from licensed installers in your area. Compare prices, check your rebate eligibility, and find the right system for your replacing gas hot water needs.
Get Heat Pump QuotesRelated Guides
Heat Pump Hub
Compare all 28 heat pump hot water systems available in Australia.
Solahart Atmos Eco 280L Review
Full specs, pros and cons, and pricing for our top replacing gas hot water pick.
Enviroheat 200L Review
Full specs and pricing for our best value replacing gas hot water pick.
Compare Heat Pumps
Side-by-side comparison tool for any two heat pump hot water systems.
Best for Cold Climate
Alpine regions, Tasmania, Canberra, and southern highlands
Best for Large Household
4-6+ people or high hot water demand
Best for Solar Homes
Running your heat pump on rooftop solar surplus
Best for Small Home or Apartment
1-2 people, limited outdoor space
Best for Off-Peak Tariff
Using controlled load or time-of-use electricity rates