Ariston 320L (ARIHPWH-320)
Rebates up to
$2,530
STC $680 · VEEC $850 (VIC) · Solar Homes up to $1,000 (VIC)
Replace-electric, medium household, best zone. Federal STCs plus the better of VIC (VEECs and Solar Homes) or NSW (ESCs). Enter your postcode below for exact figures.
VIC Solar Homes rebate
$1,000
50% of installed price up to this cap, point-of-sale. Included in the VIC total above.
VIC only. This model is on Solar Victoria's product list.
AS/NZS 4234 energy savings
71%
vs the standard's reference electric storage water heater, small load, best zone.
Register data as at CER (STC) 2026-04-30 · VEU 2026-09-01
Specifications
| Type | Integral all-in-one |
| Refrigerant | R290 |
| Tank volume | 320 L |
| Tank material | Enamelled steel tank with titanium impressed-current anode and magnesium anode corrosion protection |
| Hot water delivery | 60 °C |
| Tank height | 2058 mm |
| Tank weight (empty) | 124 kg |
| Electric backup | 1.2 kW |
Certified to
Specs from: Ariston HPWH installation/owner manuals (205L-280L and 205L-280L-320L editions); public CER SRES / 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 | 13 STCs | $520 |
| Zone 2 | 13 STCs | $520 |
| Sydney (Z3) | 16 STCs | $640 |
| Melbourne (Z4) | 17 STCs | $680 |
| Canberra (Z5) | 17 STCs | $680 |
VEU — VEECs (Victoria)
| Zone | Repl. electric metro / regional | Repl. gas | Energy savings (small load) |
|---|---|---|---|
| Melbourne (Z4) | 9 / 10 | 8 | 71.4% |
| Canberra (Z5) | 9 / 10 | 8 | 68.8% |
ESS — ESCs (NSW)
Not yet registered for ESCs.
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 and load size, calculated from the model's registered performance data, or taken directly from the register where it publishes a savings figure. VEU registers this data at the small load (the step-down load for a medium-rated system) and ESS at the medium load, so the two schemes' figures differ for the same zone.
The Ariston ARIHPWH-320 is an integral heat pump water heater: the R290 heat pump sits atop a 320 L enamelled-steel storage tank in a single monobloc casing, standing 2058 mm tall and weighing 124 kg empty. It heats water to a maximum of 60 degrees C on the heat pump alone, with a 1.2 kW electric element extending delivery to 70 degrees C.
R290 is a low-GWP hydrocarbon refrigerant (GWP of 3). The tank uses a titanium impressed-current anode plus a magnesium anode for corrosion protection, and connects via 3/4 inch (20 mm) hydraulic fittings. RCM certification (AS/NZS 60335.1, AS/NZS 60335.2.40), StandardMark (AS/NZS 4020, AS/NZS 4692) and WaterMark all apply.
ARIHPWH-320 sits at the top of the Ariston integral range alongside the 200 L and 280 L units, sharing the same heat pump platform and control interface. It currently appears only on the STC (SRES) register, not VEU or ESS.
Registered model codes
ARIHPWH-320
Homeowners
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