H2O VAULT 300L (H2O-300/N6D1)
Rebates up to
$1,580
STC $680 · VEEC $850 (VIC) · ESC $900 (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
83%
vs the standard's reference electric storage water heater, medium household, best zone.
Register data as at CER (STC) 2026-04-30 · VEU 2026-07-01
Specifications
| Type | Integral all-in-one |
| Refrigerant | R290 |
| Tank volume | 300 L |
| Tank material | Enamel inner tank, galvanized steel outer tank |
| Rated power input | 0.48 kW |
| COP | 5.21 (Inlet water 14 degC to 55 degC; air 19 degC DB / 15 degC WB) |
| Sound level | 49 dB(A) |
| Operating ambient | -10 to 43 °C |
| Tank height | 2010 mm |
| Tank diameter | 640 mm |
| Electric backup | 2 kW |
| Warranty | 5 years product warranty (excludes plumbing accessories) |
Specs from: H2O VAULT product datasheet (2024 version); 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 |
|---|---|---|---|
| Melbourne (Z4) | 9 / 10 | 9 | 82.9% |
| Canberra (Z5) | 9 / 10 | 8 | 81.4% |
ESS — ESCs (NSW)
| Zone | Repl. electric metro / regional | Repl. gas metro / regional | Energy savings |
|---|---|---|---|
| Sydney (Z3) | 28 / 29 | 14 / 14 | 76.8% |
| Canberra (Z5) | 29 / 30 | 14 / 13 | 72.8% |
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 H2O VAULT H2O-300/N6D1 is an all-in-one integral heat pump water heater: a single-cabinet unit with a 300 L enamel-lined tank and an R290 heat pump wrapped directly around the tank via a microchannel condenser coil. It draws an average of 480 W to run the heat pump (890 W max), delivering a declared COP of 5.21 under the condition of 14 to 55 degC inlet water rise with 19 degC DB / 15 degC WB air, and operates down to -10 degC ambient.
The unit carries a 2.0 kW electric backup element, a sound pressure level of 49 dB(A), and stands 2010 mm tall with a 640 mm diameter. Construction uses a galvanized steel outer tank, polyurethane insulation, and a magnesium anode for corrosion protection. H2O VAULT backs the unit with a 5-year product warranty, excluding plumbing accessories.
The 300 L unit is registered under the single model code H2O-300/N6D1 across STC, VEU, and ESS.
Registered model codes
H2O-300/N6D1
Homeowners
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