Gridly
28 Systems Ranked · Updated 2026
Best Heat Pump Hot Water for Small Home or Apartment (Australia 2026)
1-2 people, limited outdoor space. We ranked every heat pump hot water system in Australia for this specific use case, weighing noise levels and compactness as the primary factor.
Why Small Home or Apartment Changes the Choice
Binding Constraint
Physical size and noise, compact units that fit in tight spaces and meet noise regulations for apartments
Small households (1-2 people) use 80-150L per day. A 160-200L tank is sufficient. Noise matters in apartments and attached dwellings, look for units under 45dB. Compact integrated units are preferred for tight spaces.
In apartments and small dwellings, noise is often the deciding factor. Many councils enforce a 45dB limit at the property boundary for domestic equipment. A heat pump running at 50dB may be fine in a detached house but could trigger noise complaints in a strata complex. The quietest units — Reclaim and Thermann CO2 models at 37dB — are practically inaudible, while compact integrated units like the Aquatech X6 225L (42dB) offer a good balance of size, noise, and price.
Our Top Picks for Small Home or Apartment
Aquatech
X6 225L
$2,295
Why it wins: Only 42dB — barely audible. 225L tank is right-sized for 1-2 people without excess standing losses.
Enviroheat
200L
$2,000
Why it is good value: At $2,000, it is $295 less than our top pick while still meeting all the key criteria for small home or apartment. Eligible for state rebates to reduce the upfront cost further.
All Qualifying Heat Pumps for Small Home or Apartment
28 heat pump hot water systems meet our criteria for small home or apartment. Sorted by noise level (quietest first).
| System | Tank | COP | Refrigerant | Noise | Min Temp | Timer | Price | Warranty |
|---|---|---|---|---|---|---|---|---|
| Aquatech X6 225L TOP | 225L | 4.2 | R290 | 42dB | -7°C | Mid-range Timer | $2,295 | 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 |
| Apricus APHP-R290-260 | 260L | 4.1 | R290 | 43dB | -7°C | Smart Timer | $3,500 | 5yr / 5yr |
| Reclaim Energy CO2 250L | 250L | 5.0 | R744-CO2 | 37dB | -25°C | Smart Timer | $5,000 | 10yr / 6yr |
| iStore 270L | 270L | 4.8 | R290 | 46dB | -7°C | Smart Timer | $2,790 | 5yr / 5yr |
| Ecogenica R 215 | 215L | 5.0 | R290 | 50dB | -15°C | Smart Timer | $2,200 | 7yr / 5yr |
| Thermann 250L CO2 Split | 250L | 5.0 | R744-CO2 | 37dB | -25°C | Smart Timer | $5,223 | 10yr / 6yr |
| Thermastore Heatwave 270 | 270L | 4.3 | R290 | 46dB | -7°C | Mid-range Timer | $3,000 | 6yr / 5yr |
| Stiebel Eltron WWK 222 | 222L | 3.9 | R134a | 45dB | -8°C | Basic Timer | $3,500 | 5yr / 5yr |
| Solahart Atmos Eco 280L | 280L | 5.2 | R290 | 45dB | -7°C | Smart Timer | $3,500 | 7yr / 3yr |
| Emerald All-In-One 220L | 220L | 4.9 | R290 | 49dB | -7°C | Smart Timer | $2,990 | 5yr / 5yr |
| Evoheat 270-E | 270L | 4.7 | R290 | 46dB | -7°C | Smart Timer | $3,600 | 6yr / 5yr |
| Quantum 200L | 200L | 4.3 | R290 | 50dB | -7°C | Basic Timer | $3,000 | 5yr / 2yr |
| Ecogenica R 290 | 290L | 5.0 | R290 | 50dB | -15°C | Smart Timer | $2,600 | 7yr / 5yr |
| Sanden Eco Plus 250L | 250L | 5.0 | R744-CO2 | 38dB | -25°C | Smart Timer | $5,800 | 10yr / 6yr |
| Emerald All-In-One 270L | 270L | 4.9 | R290 | 49dB | -7°C | Smart Timer | $3,290 | 5yr / 5yr |
| Reclaim Energy CO2 315L | 315L | 5.0 | R744-CO2 | 37dB | -25°C | Smart Timer | $5,500 | 10yr / 6yr |
| Rinnai Enviroflo 250L | 250L | 5.0 | R290 | 48dB | -5°C | Smart Timer | $3,850 | 7yr / 3yr |
| Rheem Ambiheat HDc270 | 270L | 4.5 | R513a | 48dB | -5°C | Mid-range Timer | $3,629 | 7yr / 3yr |
| Stiebel Eltron WWK 302 | 302L | 3.9 | R134a | 45dB | -8°C | Basic Timer | $4,000 | 5yr / 5yr |
| Thermann 315L CO2 Split | 315L | 5.0 | R744-CO2 | 37dB | -25°C | Smart Timer | $5,800 | 10yr / 6yr |
| Quantum 270L | 270L | 4.3 | R290 | 50dB | -7°C | Basic Timer | $3,500 | 5yr / 2yr |
| Emerald All-In-One 320L | 320L | 4.9 | R290 | 49dB | -7°C | Smart Timer | $3,590 | 5yr / 5yr |
| Sanden Eco Plus 315L | 315L | 5.0 | R744-CO2 | 38dB | -25°C | Smart Timer | $6,200 | 10yr / 6yr |
| Rinnai Enviroflo 315L | 315L | 5.0 | R290 | 48dB | -5°C | Smart Timer | $4,200 | 7yr / 3yr |
| Quantum 340L | 340L | 4.3 | R290 | 50dB | -7°C | Basic Timer | $4,000 | 5yr / 2yr |
| Reclaim Energy CO2 400L | 400L | 5.0 | R744-CO2 | 37dB | -25°C | Smart Timer | $6,500 | 10yr / 6yr |
Tank Sizing for Small Home or Apartment
A single person needs approximately 50–80L per day. A couple uses 100–150L. A 200L tank provides ample buffer for 1-2 people, and even a 160L tank is adequate for a single occupant. Avoid over-sizing, a 300L+ tank in a 1-person apartment wastes energy on standing heat losses.
| 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 (Aquatech X6 225L, COP 4.2).
| 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 | $296 | $471 saved |
| Heat pump (off-peak) | $0.14/kWh | $129 | $638 saved |
| Heat pump (solar surplus) | $0.00/kWh | - | $767 saved |
Estimates assume 90% gas heater efficiency, COP 4.2 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 Small Home or Apartment
Can I install a heat pump hot water system in an apartment?
What is the quietest heat pump hot water system available in Australia?
What is the smallest heat pump hot water system available?
Do I need body corporate approval to install a heat pump in a unit or townhouse?
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Heat Pump Hub
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Aquatech X6 225L Review
Full specs, pros and cons, and pricing for our top small home or apartment pick.
Enviroheat 200L Review
Full specs and pricing for our best value small home or apartment pick.
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Best for Cold Climate
Alpine regions, Tasmania, Canberra, and southern highlands
Best for Replacing Gas Hot Water
Switching from a gas storage or continuous flow system
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 Off-Peak Tariff
Using controlled load or time-of-use electricity rates