Stiebel Eltron 220L (WWK 222)
Rebates up to
$1,440
STC $600 · ESC $840 (NSW)
Replace-electric, medium household, best zone. Enter your postcode below for exact figures.
VIC Solar Homes rebate
$1,000
50% of installed price, point-of-sale. Stacks with STC/VEEC above.
VIC only. Assumed eligible, not confirmed against the live Solar Victoria product list.
AS/NZS 4234 energy savings
69%
vs the standard's reference electric storage water heater, medium household, best zone.
Register data as at CER (STC) 2026-04-30
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) |
| 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 WWK 222-302 H Operation and Installation Manual (Australia); public STC / VEU / ESS registers.
Certificate rebate by postcode
Registered certificate values
Every scheme this model is registered for, by zone. STCs at $40, VEECs at $85, ESCs at $30 (reference prices as at 2026-07-07). Claim year 2026, medium household.
SRES — STCs (national)
| Zone 1 | 12 STCs | $480 |
| Zone 2 | 13 STCs | $520 |
| Sydney (Z3) | 14 STCs | $560 |
| Melbourne (Z4) | 15 STCs | $600 |
| Canberra (Z5) | 15 STCs | $600 |
VEU — VEECs (Victoria)
Not yet registered for VEECs.
ESS — ESCs (NSW)
| Zone | Repl. electric metro / regional | Repl. gas metro / regional | Energy savings |
|---|---|---|---|
| Sydney (Z3) | 25 / 26 | 11 / 11 | 69.4% |
| Canberra (Z5) | 27 / 28 | 12 / 11 | 67.7% |
Certificate counts are computed from the model's registered performance data using the current regulated equations. A lodged claim depends on the specific installation, household size, and the scheme rules in force at creation. Energy savings % is against the AS/NZS 4234:2021 reference electric storage water heater for that zone, medium household, calculated from the model's registered performance data.
The Stiebel Eltron WWK 222 is an all-in-one integral heat pump water heater: 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. 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.
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, with an average sound pressure level of 45 dB(A) at 1 m (sound power level 60 dB(A)).
The WWK 222 H shares the same 220 L cabinet but adds a 1.5 kW electric emergency/booster heater for operation outside the heat pump’s application limits or one-off rapid heat-up. The two variants are registered and warranted separately.
Registered model codes
WWK222, WWK 222
Homeowners
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