Rheem 178L (551180)
Rebates up to
$1,630
STC $640 · ESC $990 (NSW)
Replace-electric, medium household, best zone. Federal STCs plus the better of VIC (VEECs) or NSW (ESCs). Enter your postcode below for exact figures.
AS/NZS 4234 energy savings
81%
vs the standard's reference electric storage water heater, medium load, best zone.
Register data as at CER (STC) 2026-04-30
Specifications
| Type | Integral all-in-one |
| Refrigerant | R134a |
| Tank volume | 178 L |
| Rated power input | 0.683 kW |
| COP | 4.5 (at 19 degrees C ambient) |
| Sound level | 48 dB(A) |
| Operating ambient | -7 to 43 °C |
| Tank height | 1810 mm |
| Tank diameter | 532 mm |
| Electric backup | 2.4 kW |
| Warranty | Cylinder 7, sealed system 3, other parts 1 |
Specs from: Rheem Australia dealer product pages and installation instructions (rheem.com.au); public STC / 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 | 12 STCs | $480 |
| Sydney (Z3) | 15 STCs | $600 |
| Melbourne (Z4) | 16 STCs | $640 |
| Canberra (Z5) | 16 STCs | $640 |
VEU — VEECs (Victoria)
Not yet registered for VEECs.
ESS — ESCs (NSW)
| Zone | Repl. electric metro / regional | Repl. gas metro / regional | Energy savings (medium load) |
|---|---|---|---|
| Sydney (Z3) | 30 / 31 | 15 / 15 | 81.0% |
| Canberra (Z5) | 32 / 33 | 16 / 16 | 79.3% |
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The Rheem AmbiPower MDc-180 (551180) is the earlier R134a-refrigerant generation of the MDc-180 all-in-one heat pump, superseded on Rheem’s current site by the R513a 551D180. It shares the wrap-around microchannel heating design and 178 L storage tank (168 L boost capacity), with a rated heat pump power input of 683 W and a 2.4 kW electric backup element.
Declared COP is 4.5 at 19 degrees C ambient, sound level 48 dB(A) at 1 metre, and operating range -7 to 43 degrees C. Overall cabinet dimensions are 1810 mm high by 532 mm wide and deep.
551180C6 is a colour/anode variant of the same physical unit, grouped here under the same register listing. Warranty is 7 years on the cylinder (3 years labour), 3 years on the sealed system, 1 year on other parts.
Registered model codes
551180, 551180C6
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