Stiebel Eltron 220L (WWK 222) - NZ
AS/NZS 4234 energy savings (AU equivalent)
69%
vs the standard's reference electric storage water heater, ESS Zone 3, based on the AU-registered performance of the Stiebel Eltron 220L (WWK 222) (identical model code WWK 222 and brand, sold in both AU and NZ; the German-engineered unit is the same global product in both markets) — not tested against AS/NZS 4234 as a NZ product itself.
Specifications
| Type | Integral all-in-one |
| Refrigerant | R134a |
| Tank volume | 220 L |
| Rated power input | 0.5 kW |
| COP | 3.94 (Annual Average COP, AS/NZS 4234, climate zone 2, medium load (AU test data for the identical unit)) |
| Sound level | 45 dB(A) |
| Hot water delivery | 61 °C |
| Operating ambient | -5 to 42 °C |
| Tank height | 1501 mm |
| Tank diameter | 690 mm |
| Tank weight (empty) | 120 kg |
| Electric backup | None (heat pump only) |
| Warranty | Cylinder/condenser 5, sealed refrigeration system 2, T&P relief valve 1 (domestic use) |
Specs from: Stiebel Eltron New Zealand product page (stiebel-eltron.co.nz/wwk); specs cross-referenced from the identical AU-registered WWK 222 operation and installation manual. Official product page →
Sold in New Zealand
NZ has no equivalent to the Australian STC/VEEC/ESC certificate schemes, so no dollar rebate applies to this model. Its confirmed AU-market equivalent is registered and shown above.
What customers say
Sourced from EnergyAE's HPWH customer-sentiment dataset (public review sites and forums). A small, self-selected sample — not a representative survey.
“The non-H version doesn't have a backup electric element so draws a max of 0.55 kW or 2.3A and can work down to -5 degrees.”
Scott3 · Geekzone
The Stiebel Eltron WWK 222 is an all-in-one integral heat pump water heater sold under the same brand and model code in New Zealand and Australia: the R134a heat pump sits in the upper section of the cabinet directly above a 220 L DHW cylinder, with no separate outdoor unit or field refrigerant piping. Stiebel Eltron NZ markets the WWK range as drawing only 2.3 A - among the lowest current-draw heat pumps on the market - and saving up to 74% on hot water energy use compared to a traditional electric cylinder.
Average power consumption of the heat pump at the A15/W10-55 test condition is 0.5 kW, and the heat pump operates down to -5 degrees C ambient, up to +42 degrees C. Annual Average Coefficient of Performance under AS/NZS 4234 (climate zone 2, medium load) is 3.94, per the AU test data for the identical unit; New Zealand has no equivalent mandated test standard.
The WWK 222 has no electric emergency/booster heater: DHW heating relies solely on the heat pump, which reaches a default set temperature of 61 degrees C. The unit stands 1501 mm tall, 690 mm in diameter, and weighs 120 kg empty. The WWK 222 H shares the same 220 L cabinet but adds an electric emergency/booster heater.
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