If you’re upgrading to a heat pump hot water system, two of the most commonly recommended 270-litre models on the market are the iStore 270L and the Emerald 270L (Select). Both are VEU-eligible, both use the environmentally-friendly R290 refrigerant, and both suit a similar household size — so the real differences come down to recovery speed, efficiency rating, smart features, and warranty coverage. Here’s an honest side-by-side.

Quick specs comparison

Feature	iStore 270L (PASHW015-270LD-FL02-R290)	Emerald 270L (Select, HPA1-S270)
Tank capacity	270L	270L
Suits	3–6+ people	4–5 people
Refrigerant	R290 (natural, low GWP)	R290 (natural, low GWP), ~450g charge
Compressor	900W	—
Heating output	Up to 5.05kW	2.8kW
COP (coefficient of performance)	Manufacturer figures vary by ambient conditions	4.41 (test-bench conditions)
Recovery rate	~130L/hour	~58L/hour
Sound level	—	~50dB(A) at 1m
Smart controls	LCD touch screen, smart-control compatible	Built-in WiFi, Emerald App
Backup element	Yes	Yes (Booster/E-Heater mode)
Insulation	50mm+	Manufacturer-rated
Typical warranty	5 years parts & labour (commonly supplied)	5 years tank, 5 years parts, 2 years labour (per Emerald’s official data sheet — some retailers advertise extended terms, worth confirming at quote stage)
Anti-bacterial cycle	Standard heat pump hygiene cycling	Automatic weekly heat-to-60°C+ cycle
VEU / rebate eligible	Yes	Yes

Note: COP, warranty terms, and recovery figures can vary slightly between retailers and specific model variants (Select vs. Boost vs. E-Heater editions). We’ll confirm the exact current spec sheet for your chosen model at quote stage.

Where the iStore 270L stands out

The standout figure is recovery rate — at roughly 130 litres per hour, the iStore’s 900W compressor and 5.05kW heating output are built for households that use a lot of hot water in a short window (back-to-back showers, a busy laundry day, teenagers). If your household regularly runs the tank down and needs it to bounce back quickly, this is the more forgiving system.

Best for: larger or high-demand households (3–6+ people), families who’ve previously run out of hot water on busy mornings
Trade-off: smart/app control is more basic (LCD touch panel) compared to Emerald’s full app ecosystem

Where the Emerald 270L stands out

The Emerald’s headline number is its COP of 4.41 under test conditions — a strong efficiency figure that translates to lower running costs per litre heated, provided your household’s usage pattern doesn’t regularly outpace its slower ~58L/hour recovery rate. It also comes with a genuinely useful smart feature set: built-in WiFi, a companion app for scheduling heating around your solar production window, and an automatic weekly anti-legionella cycle built in as standard.

Best for: medium households (4–5 people) who want strong efficiency and full app-based control, especially if pairing with solar to schedule heating during the day
Trade-off: slower recovery rate means a big household with heavy back-to-back usage may notice the tank take longer to catch up

What actually matters for your decision

Household size and usage pattern — if you’re 5+ people or regularly run the tank dry, the iStore’s faster recovery is the more practical fit. If you’re a typical 4-person household with steadier usage, the Emerald’s efficiency and app control are hard to beat.
Solar pairing — both systems can be scheduled to run during solar generation hours, but Emerald’s app makes this scheduling more straightforward out of the box.
Noise sensitivity — if the unit will sit near a bedroom window or a neighbour’s fence line, ask us for the current dB rating on both units at installation, since outdoor placement affects perceived noise more than the spec sheet alone.
Warranty terms — confirm the exact current warranty for the specific model and retailer package, as these are periodically updated by both manufacturers.

Rebates apply to both

Both the iStore 270L and Emerald 270L are VEU-eligible under Victoria’s Energy Upgrades program, and may also qualify for the Solar Victoria hot water rebate (up to $1,000, or up to $1,400 for eligible locally-manufactured models — worth checking which applies to your chosen unit) and federal STCs, subject to eligibility. As always, confirm current rebate values and eligibility criteria before signing a quote, since these move with government settings.

Not sure which one suits your home?

Tell us your household size, typical hot water usage pattern, and whether you’re planning to pair with solar — we’ll recommend the right model and handle the rebate paperwork either way.

Greentastic Pty Ltd 📞 1300 001 392 ✉️ info@greentastic.com.au 🌐 greentastic.com.au

Specifications sourced from manufacturer data sheets and retailer listings current as of publication and may vary by model variant and update. COP and recovery figures are typically measured under standardised test conditions and real-world performance depends on ambient temperature, usage pattern, and installation. Rebate figures are indicative and subject to change — confirm current values via energy.vic.gov.au and solar.vic.gov.au.

iStore 270L vs Emerald 270L: Which Heat Pump Hot Water System Is Right for Your Home?