New Zealand · costs in NZD
Reverse cycle split system air conditioner, wall hung
LG WS18TWU / WS18TWN Heat Pump
LG WS18TWU / WS18TWN is a 4.8 kW reverse cycle split system heat pump registered for sale in New Zealand under the trans-Tasman E3 energy rating scheme (registration AAC8354).
- Energy rating (cooling)
- 3.5
- Heating: 1.5
- Annual electricity use
- 2,712 kWh
- 248 cooling + 2,464 heating
- Estimated running cost
- $895 / year
- $75 / month · $8,950 over 10 years
- Capacity
- 4.8 kW cooling
- 5.9 kW heating
26% more electricity than the median of 236 comparable 5 kW reverse cycle split system registrations (2,154 kWh a year) in the cold zone. Uses less than 1% of them.
Across all 3,611 air conditioner registrations sold in Australia, it uses less than 66% (this compares very different sizes, so the cohort figure above is the useful one).
Annual kWh is the government label figure for a residential user in the cold zone (Canberra climate: Canberra, Hobart, Ballarat, alpine areas). All of New Zealand is the cold zone on the Zoned Energy Rating Label. Cost = kWh × 33c/kWh in NZD; change the price above to your tariff.
LG WS18TWU running cost by climate zone
| Climate zone | kWh / year | Per year | 10 years |
|---|---|---|---|
| Cold zone | 2,712 | $895 | $8,950 |
| Mixed zone | 1,256 | $414 | $4,145 |
| Hot zone | 1,291 | $426 | $4,260 |
At 33c/kWh. Formula: cost = annual kWh × price. The kWh figure is the label’s residential estimate for that zone; commercial-profile figures are in the specifications.
Heat pumps that use less electricity
Same configuration and type, cooling capacity within 12% of 4.8 kW, at least 3% lower annual kWh in the cold zone.
| Model | Stars | Est. cost / yr | Compare |
|---|---|---|---|
| Daikin RXM46AVMA / FTXM46AVMA4.7 kW heating4.6 kW cooling1,543 kWh/yr | 4.5 | $509 | |
| Daikin RXM46WVMA / FTXM46WVMA4.7 kW heating4.6 kW cooling1,571 kWh/yr | 4.5 | $518 | |
| Gree GWH15AGDXD-K6DNA1A/O / GWH15AGDXD-K6DNA1A/I4.7 kW heating4.6 kW cooling1,835 kWh/yr | 4 | $606 | |
| Gree GWH15QDXE4.7 kW heating4.6 kW cooling1,839 kWh/yr | 3 | $607 | |
| Midea MFCA50VA-W/MFCA50VA-N5.2 kW heating5.2 kW cooling1,841 kWh/yr | 4.5 | $608 |
Heat pumps similar to the LG WS18TWU
Technically comparable registrations: same configuration and type, capacity within 12%.
| Model | Stars | Est. cost / yr | Compare |
|---|---|---|---|
| Midea MFAG51VA-W/MFCS50VA-N5.5 kW heating4.9 kW cooling2,122 kWh/yr | 4.5 | $700 | |
| Comfee CASG-XG50/CASN-XG505.5 kW heating5 kW cooling2,168 kWh/yr | 4.5 | $715 | |
| Comfee CASG-XG51/CASN-XG515.5 kW heating5 kW cooling2,151 kWh/yr | 4.5 | $710 | |
| Gree GWH15AGDXD-K6DNA1A/O / GWH15AGDXD-K6DNA1A/I4.7 kW heating4.6 kW cooling1,835 kWh/yr | 4 | $606 | |
| Gree GWH15QDXE-K6DNA1A/O / GWH15QDXE-K6DNA1A/I4.7 kW heating4.6 kW cooling1,839 kWh/yr | 3 | $607 | |
| Daikin RXM46WVMA / FTXM46WVMA4.7 kW heating4.6 kW cooling1,571 kWh/yr | 4.5 | $518 | |
| Daikin RXM46AVMA / FTXM46AVMA4.7 kW heating4.6 kW cooling1,543 kWh/yr | 4.5 | $509 |
Other LG models of similar capacity
| Model | Stars | Est. cost / yr | Compare |
|---|---|---|---|
| LG AS18S1U / AS18S1N5.2 kW heating4.8 kW cooling2,188 kWh/yr | 3.5 | $722 |
Compare WS18TWU / WS18TWN with another model
LG WS18TWU specifications
- Type
- Reverse cycle
- Configuration
- Split system
- Air distribution
- Non-ducted
- Indoor unit
- Wall hung
- Rated cooling capacity (35 °C)
- 4.80 kW
- Cooling power input
- 1.46 kW
- Rated heating capacity (7 °C)
- 5.90 kW
- Heating power input
- 1.68 kW
- EER, full load (tested)
- 3.57
- COP, full load (tested)
- 3.68
- Rated AEER
- 3.27
- Rated ACOP
- 3.51
- Standby power (PIA)
- 2.0 W
- Compressor
- Variable speed, Inverter
- Refrigerant
- R32
- Power supply
- Single phase
- Indoor sound power
- 63.2 dB(A)
- Outdoor sound power
- 60.9 dB(A)
- Demand response (AS/NZS 4755)
- Yes
- Country of manufacture
- Thailand
Dimensions are not collected for registrations under the 2019 Determination, so they are shown only where the source has them.
LG WS18TWU zoned energy rating figures
As published for each climate zone. Residential figures drive the star ratings; commercial figures assume a commercial usage pattern.
| Zone | Profile | Cooling stars | Heating stars | Cooling kWh | Heating kWh |
|---|---|---|---|---|---|
| Coldcommercial | commercial | – | – | 425 | 767 |
| Coldresidential | residential | 3.5 | 1.5 | 248 | 2,464 |
| Mixedcommercial | commercial | – | – | 599 | 365 |
| Mixedresidential | residential | 3.5 | 2.0 | 400 | 856 |
| Hotcommercial | commercial | – | – | 1,480 | 72 |
| Hotresidential | residential | 3.5 | 3.0 | 1,176 | 115 |
Part-load test points (23 values)
- c__t1_min_cap_power_rated
- 380 W
- h__h2_ext_cap_power_rated
- 1870 W
- c__t1_half_cap_power_rated
- 490 W
- c__t1_have_min_cap_results
- Yes
- h__h1_half_cap_power_rated
- 597 W
- h__h1_have_min_cap_results
- No
- h__h3_have_ext_cap_results
- No
- h__h2_have_full_cap_results
- No
- h__h2_have_half_cap_results
- No
- h__h3_have_full_cap_results
- No
- h__h3_have_half_cap_results
- No
- h__h2_ext_cap_heat_cap_rated
- 4420 W
- h__h1_half_cap_heat_cap_rated
- 2950 W
- h__h2_is_capable_extended_load
- Yes
- c__low_temp_min_cap_power_rated
- 280 W
- c__t1_min_cap_cooling_cap_rated
- 1750 W
- c__low_temp_full_cap_power_rated
- 1334.44 W
- c__low_temp_half_cap_power_rated
- 400 W
- c__t1_half_cap_cooling_cap_rated
- 2400 W
- c__low_temp_have_half_cap_results
- Yes
- c__low_temp_min_cap_cooling_cap_rated
- 1850 W
- c__low_temp_full_cap_cooling_cap_rated
- 5169.599999999999 W
- c__low_temp_half_cap_cooling_cap_rated
- 2585 W
New Zealand E3 registration details
- Registration number
- AAC8354
- GEMS registration id
- 163380
- Status
- approved, available (self-reported)
- Registration expires
- 17 July 2029
- Registered for sale in
- Australia, New Zealand
- Family
- –
- Regulatory standard
- [SEER Non Multi-Split <=65kW] GEMS (Air Conditioners up to 65kW) Determination 2019
- Test standard
- AS/NZS 3823.1.1:2012
- MEPS
- 2019
- Product class
- Class 9
Source: E3 programme registration data (EECA, New Zealand) (trans-Tasman E3 registration data published by DCCEEW on data.gov.au, CC BY 3.0 AU). Dataset published 19 September 2026; last checked 20 September 2026. How the derived figures are calculated.