Heat pump hot water brand comparison for Perth homes: Reclaim, Sanden, Rheem, Dux
Perth households replacing a gas or electric hot water system with a heat pump have several brands to choose from. Here's how Reclaim Energy, Sanden, Rheem, and Dux compare on efficiency, warranty, and fit for Perth conditions.
If you're replacing a hot water system in Perth and want a heat pump, four brands cover most of the market: Reclaim Energy, Sanden, Rheem, and Dux. The short version: Reclaim Energy and Sanden's CO₂ heat pumps give you the highest efficiency and generally cost more upfront. Rheem has the deepest trade network in Perth, so it's the easiest to get serviced for years to come. Dux is the budget entry point, and its efficiency is closer to the premium brands than you'd expect.
All four work fine in Perth's climate. Perth winter nights commonly dip into single digits, and COP does drop a little on those colder mornings, but the effect is smaller than in Melbourne or Canberra, and most installers schedule water heating to run during the day rather than overnight anyway, so the practical impact is minor. The real differences between these brands are price, warranty terms, tank flexibility, and how easy each one is to get serviced locally, not whether the heat pump will actually work in Perth.
Which brand should you pick?
- Want the highest efficiency and don't mind paying for it? Reclaim Energy or Sanden. Both use CO₂ refrigerant and rate COP 5.0 or higher.
- Want the widest service network and the easiest repairs down the track? Rheem. It's Australia's most established hot water brand, with more Perth technicians trained on it than any other.
- Want the lowest price to get started? Dux. Entry-level cost, and COP that holds up better than its budget positioning suggests.
- Short on outdoor space? Sanden's split-system design lets you keep the tank indoors and the heat pump unit outside.
How do heat pump hot water systems work?
A heat pump pulls heat out of the air around it and moves that heat into your water, using the same refrigerant cycle as a reverse-cycle air conditioner, just running in the opposite direction.
COP (Coefficient of Performance): how much heating you get per unit of electricity in. A COP of 4 means 1 kWh of electricity produces 4 kWh of hot water heating. COP is highest in mild air and drops as the outside temperature falls, that's simple thermodynamics. Manufacturers rate COP at a specific test condition, so treat any number as a guide rather than a guarantee of what you'll see on a cold morning.
Perth's climate suits heat pumps well. Winters here are mild, so the cold-weather performance penalty that shows up in Melbourne or Canberra barely registers in a Perth backyard.
For the full rundown on running costs and how heat pump hot water stacks up against a gas or resistive electric system, see our complete guide to heat pump hot water in Perth.
Reclaim Energy CO₂ heat pump
Technology: CO₂ (R744) refrigerant, a different refrigerant from the HFC/HFO gear most other brands use. CO₂ heat pumps hold a high COP at lower ambient temperatures and heat water to higher temperatures more efficiently.
COP: Around 5.0, one of the highest ratings in the category.
Tank capacity: 315L is the standard reference size. The heat pump unit is separate from the storage cylinder, so it pairs with several tank brands: a Reclaim Energy + Rheem cylinder, a Reclaim Energy + Chromagen cylinder, or a Reclaim Energy + Everhot stainless cylinder, with sizing that varies by cylinder choice.
Installed cost: Depends heavily on which cylinder you pair it with and how complex the install is. Get a couple of local quotes to compare.
Warranty: 7 years on the heat pump unit, or 10 years if you choose the WiFi-connected model. Some paired stainless cylinders (Chromagen, for example) carry warranties up to 15 years.
Fit for Perth: CO₂ technology's advantage is biggest in cold conditions, so Perth's mild winters shrink the COP edge over HFC-based models compared to what you'd see in Melbourne or Canberra. It's still a strong choice: the higher COP across all temperatures is genuinely better year-round, not just in winter.
Worth knowing: Reclaim Energy units need a certified plumber and electrician for installation. This isn't a one-trade job.
Sanden Eco® Plus CO₂ heat pump
Technology: Also CO₂ refrigerant (R744), like Reclaim Energy. Sanden is a Japanese manufacturer with a strong commercial refrigeration background.
COP: Around 6.0, the highest rating of the four brands here.
Tank capacity: 160L, 250L, 300L, or 315L. The unit is a split system, outdoor heat pump plus indoor or outdoor tank, which allows more flexible installation than an integrated unit.
Installed cost: Generally the highest of the four, reflecting the split design and CO₂ technology. Get a local quote before you compare against the others.
Warranty: 6 or 10 years on the heat pump unit, depending on the model.
Worth knowing: Sanden's standard stainless tank carries a long prorated warranty in most of Australia, but that term is explicitly excluded in WA under Sanden's own warranty conditions. If you're in Perth, confirm the current WA tank warranty with your installer before you buy, don't assume the headline number on Sanden's marketing applies here.
Fit for Perth: The split design pays off where tank placement flexibility matters. You can tuck the tank inside a utility room while the heat pump exhausts air outdoors, which suits homes with limited outdoor space.
Rheem Ambiheat systems
Technology: R513a refrigerant, with the heat pump built into the top of the tank as one integrated unit.
COP: Around 4.5, lower than the CO₂ models but adequate for Perth's climate.
Tank capacity: 200L, 270L, or 325L.
Installed cost: Generally the lowest-cost entry to heat pump hot water among the established brands. Get a local quote to see how it compares.
Warranty: The cylinder carries a 10-year supply warranty (3 years for labour); the heat pump component itself is covered for 3 years. A 5-year whole-of-product warranty is available if your installer uses the VEEC or ESC energy-certificate scheme when they install it, so ask about that upfront.
Fit for Perth: Rheem is Australia's most established hot water brand with the widest service network going. If long-term serviceability and trade familiarity matter to you, Rheem gives you the broadest technician coverage across Perth. It's an integrated unit, so check clearance and ceiling height against the installation manual before you commit.
Dux Ecosmart heat pump (budget-friendly option)
Technology: R290 refrigerant, a hydrocarbon-based gas with a low global warming potential, in an integrated all-in-one unit.
COP: Around 4.2 to 4.7 depending on tank size, closer to the premium brands than Dux's budget positioning suggests.
Tank capacity: 200L, 270L, or 285L.
Installed cost: Entry-level pricing, generally the lowest of the four brands here. Get a local quote to confirm.
Warranty: The tank is covered for 7 years; the refrigeration components, including labour, for 3 years; other parts for 1 year. A 5-year whole-of-product warranty applies if you install from September 2025 onward.
Fit for Perth: Dux is still the cost entry point of the four, but its efficiency holds up better than the older "budget equals worse COP" assumption. For households replacing a failing system without strong electrification ambitions, Dux gets you solid performance at a budget-accessible price. The tradeoff is warranty length and refrigerant type, not raw running cost.
How do the four brands compare side by side?
| Brand | Refrigerant | COP | Tank sizes (L) | Heat pump warranty |
|---|---|---|---|---|
| Reclaim Energy | CO₂ | ~5.0 | 315 | 7 years (10 years, WiFi model) |
| Sanden Eco Plus | CO₂ | ~6.0 | 160–315 | 6 or 10 years |
| Rheem Ambiheat | R513a | ~4.5 | 200–325 | 3 years (5 years, VEEC/ESC condition) |
| Dux Ecosmart | R290 | ~4.2–4.7 | 200–285 | 3 years (5 years for installs from Sept 2025) |
Installed cost isn't in this table on purpose: it swings too much with cylinder choice, install complexity, and who's quoting. Get two or three local quotes once you've narrowed down a brand.
What matters most when choosing for Perth?
Climate fit. Perth's mild winters mean the CO₂ advantage of Reclaim or Sanden is smaller here than it would be in Canberra or Hobart. Any of these four brands performs well in Perth conditions, so climate alone won't make the decision for you.
Solar pairing. All four brands can be timer-set to run during Synergy's Midday Saver super off-peak window, 9am to 3pm, to line up with peak solar generation. Solar diverter compatibility varies by model, so confirm with your installer if diverter integration matters to you. If you're weighing a diverter against a heat pump outright, our solar diverter vs heat pump hot water comparison walks through the tradeoff. If you already have solar and just want the timing right, see our guide to timing your hot water system around solar.
Space. Integrated all-in-one units (Rheem, Dux) need clearance around the unit for airflow and enough ceiling height above it, and both requirements vary by model, so check the installation manual for your exact unit. Split systems (Sanden, some Reclaim configurations) separate the tank from the outdoor heat pump unit, which gives you more installation flexibility.
Trade availability in Perth. Rheem has the deepest trade network and the fastest service turnaround. CO₂ brands (Reclaim, Sanden) need more specialist installation know-how: not every plumber is trained on them, so confirm your installer is certified for the specific brand before you book.
STC eligibility. Heat pump hot water systems from eligible brands qualify for federal small-scale technology certificates, on top of any state-based support. The dollar value depends on your model and your STC zone, commonly landing somewhere in the $600–$900 range, but ask your installer for the exact figure before you sign.
Heat pump hot water is usually one part of a bigger switch away from gas. If you're also weighing up induction cooktops, EV charging, or going all-electric more broadly, our guide to the electrify everything movement covers how the pieces fit together.
Money-relevant figures in this article are checked against primary sources. Here’s how we check our facts.
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