The longest lasting heat pump hot water systems for NSW homes

One range came out ahead in every size: the Reclaim Energy CO2 heat pump with a stainless steel tank. The heat pump is the same in all three sizes; only the tank changes.

Prices are CHOICE's listed prices before rebates. Installed prices in NSW usually run $6,600 to $8,000 before rebates. Each model is sold under a smaller number than the water it really holds.

• The longest cover on the part that usually fails. Reclaim's May 2026 warranty covers the whole heat pump, compressor included, for 10 years parts and labour. Most brands cover it for 2 to 5 years. A maker that has to pay for repairs for a decade has every reason to build it to last that long.
• A stainless tank with no anode to replace. The tank carries a 15 year warranty. Enamel tanks, used by most cheaper brands, rely on an anode rod that wears away and must be replaced.
• Proven technology. It uses CO2 as the refrigerant and a Japanese compressor, the same approach Sanden, Daikin and Panasonic use. CO2 units heat water hotter and keep working in colder weather than most other types, and this one has no electric element to burn out.
• The best owner reviews in the category. 4.9 out of 5 from 106 reviews on ProductReview and 4.7 from 86 on SolarQuotes, when we checked.
• A NSW company. Reclaim is based in Byron Bay, and the tanks are made in Australia.

No system is perfect, and Reclaim's fine print matters more if you live in the country.

• It is young. Reclaim has sold heat pumps since 2018, and most owner reviews are for systems under three years old. Nobody has 15 years of real world data on it yet. The warranty is a promise, not proof.
• The tank cover tapers off. A faulty tank is replaced in full for the first 6 years. From year 7 to year 15, Reclaim pays a falling share, from 90% down to 10%. Sanden pays in full for 10 years.
• Regional homes get less. Labour on tank claims applies in capital city metropolitan areas, and heat pump service labour is capped at 2 hours including up to 25 km of travel. If you live well out of Sydney, Newcastle or Wollongong, ask the installer who will do warranty work and what it costs.
• Water and frost limits. The warranty does not cover unfiltered rainwater, bore, dam or river water, or freezing in places where it gets colder than -10°C.
• Do not undersize it. Reclaim can refuse a claim if the unit runs more than 15 hours a day, which is what happens when the tank is too small for the household.

• Sanden Eco Plus. The CO2 heat pump with the longest record in Australia, sold here since 2011, with Japanese heat pumps and Australian made 316 stainless tanks. It has the best tank terms of any brand: 10 years in full, then 5 years part cover. The heat pump is covered for 6 years, or 10 years if you buy the new Wi-Fi controller and slim tank announced in June 2026, so ask for that combination. Owner reviews are mixed, at 3.6 from 134 on ProductReview, mostly about control boards failing between years 3 and 7.
• Daikin CO2. On paper it matches Reclaim: 10 years parts and labour on the whole system and a duplex stainless tank that Daikin says resists corrosion better than ordinary stainless. It launched in July 2026, so there is no track record, it only comes in 250 L and 315 L, and it can only be installed by Daikin appointed specialists. One to watch.
• Rinnai Enviroflo S split, for frost country. An enamel tank, so it needs anode checks, and a 5 year heat pump warranty. But it keeps a backup element that takes over below -10°C, which suits Cooma, the Monaro and the coldest parts of the New England.
• iStore, on a tight budget. Usually $2,800 to $4,400 installed against $6,600 to $8,000 for Reclaim, with strong reviews. It has a glass lined tank with an anode and 5 years cover on everything, so expect a shorter life and plan for a service by year 5.

The heat pump warranty is the best sign of how long a maker expects its unit to last.

From each maker's current warranty or specification sheet, October 2026. Conditions apply to all of them, so read the warranty before you sign. Apricus recalled an all in one model in April 2025, and Chromagen, Thermann and Ecogenica have had recalls since 2024. We found none for Reclaim, Sanden, Daikin or Panasonic.

Most installers and makers quote 10 to 15 years for a heat pump, about the same as an electric or gas storage tank, which usually last 8 to 15 years. Those figures come from the industry, not from independent studies. CHOICE does not test heat pump hot water systems and has no reliability data newer than 2017.

What usually ends a heat pump's life:

• The compressor or refrigerant circuit. The most expensive failure. Out of warranty it is often not worth fixing, which is why the heat pump warranty matters more than the tank warranty.
• Control boards and sensors. The most common complaint across brands. Power surges and lightning are usually not covered.
• Tank corrosion. Once an enamel tank's anode is used up, the tank starts to rust. Stainless avoids that, unless the water is salty or acidic.
• Hard or untreated water. Scale builds up on valves and the heat exchanger, and most warranties exclude bore, dam and untreated rainwater.
• A poor install. A tank too small for the household, a unit jammed where air cannot reach it, or drains that do not run away properly.

• Every six months: gently lift and lower the lever on the relief valve on the tank, so it does not seize. You can do this yourself. Solahart warns that skipping it can lead to the tank failing.
• Every five years: a plumber's service. They replace the relief valve, check the other valves and, on an enamel tank, check the anode. It is not covered by warranty, so budget for it.
• All the time: keep leaves, bins and stored junk away from the fan, and keep the condensate drain clear.
• In frost: leave the power on, so the freeze protection can run.
• On tank or bore water: get the water tested before you buy, and match the system to the result.

Two rebates apply in NSW, and the installer takes both off the price, so you never claim them yourself.

• NSW Energy Savings Scheme: up to $640 when you replace an electric hot water system and up to $330 when you replace gas. You pay at least $200 yourself. Since December 2025, systems need at least a 5 year warranty on the tank and the heat pump to qualify, which all three of our picks have. See the NSW Government's hot water page.
• Federal certificates (STCs): roughly $500 to $600 on a 2026 install in most of NSW. The number of certificates falls each year until the scheme ends after 2030, so installing sooner gets a little more.

If you are replacing gas, our guide to getting off gas covers the rest of the switch. The NSW Home Energy Saver loan can spread the cost with no interest.

How long does a heat pump hot water system last?

Most installers and makers say 10 to 15 years, and the part that usually decides it is the compressor in the heat pump. There is no independent long term study of Australian units yet, so the best guide you have is how long the maker will cover the heat pump itself. A 10 year parts and labour warranty on the heat pump is the strongest promise on the market in 2026.

Which heat pump hot water system lasts the longest?

On the evidence available in October 2026, the Reclaim Energy CO2 range with a stainless steel tank. It has a 10 year parts and labour warranty on the whole heat pump, a 15 year stainless tank, no anode to replace and the best owner reviews in the category. Sanden Eco Plus has been sold here longer, since 2011, and Daikin's new CO2 unit matches Reclaim's warranty but only launched in July 2026.

What size heat pump hot water system do I need?

As a rule of thumb, about 160 to 180 L for one or two people, 250 to 280 L for three or four, and 315 L or more for five or more. Go up a size if your household takes long showers, has a spa bath, or might grow. A unit that is too small runs for too many hours a day, which wears it out faster and can void the warranty.

Is a stainless steel tank better than an enamel tank?

For longevity, usually yes. Enamel (glass lined) tanks rely on a sacrificial anode rod that has to be checked and replaced, often by year 5 to 8, or the tank rusts through. Stainless tanks do not need one. The catch is that stainless does not like salty or acidic water, so makers set limits on chloride and pH. On town water that is not a problem. On bore, dam or untreated rainwater, check the limits first.

Do heat pump hot water systems work in frost?

CO2 heat pumps such as Reclaim, Sanden and Daikin keep heating down to -10°C without an electric element. Many cheaper all in one units stop at -5 to -7°C and switch to an element, which costs more to run. Orange is usually fine. Cooma and the coldest parts of Armidale have dropped below -10°C, and Reclaim's warranty does not cover freezing in places that do, so ask the installer about your exact spot.

What rebates are there for a heat pump hot water system in NSW?

Two, and the installer takes both off the price. The NSW Energy Savings Scheme gives up to $640 when you replace an electric hot water system and up to $330 when you replace gas, and you pay at least $200 yourself. Federal small scale technology certificates are worth roughly $500 to $600 on a 2026 install in most of NSW, falling a little each year to 2030.

How do I make my heat pump last longer?

Lift the relief valve lever gently every six months, have a plumber service it every five years, keep leaves and clutter away from the fan, and leave the power on in frosty weather so the freeze protection works. If you have an enamel tank, have the anode checked at the five year service.

A heat pump saves the most when it replaces an electric tank, and it is usually best to swap when your current system wears out. Type your address to see what it would cost and save in your council area, and which rebates apply.