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When it comes to precision engineering and a "set and forget" reputation, Stiebel Eltron is the gold standard. The WWK302H is their flagship integrated heat pump, and it’s a beast designed to tackle the New Zealand climate with European efficiency.
Stiebel Eltron has been at the forefront of heat pump technology since the 70s. The WWK302H (the 'H' stands for the built-in smart element) is a premium, German-engineered unit that focuses on longevity and performance in colder climates—making it a top-tier contender for Kiwi backyards.
Unlike some units where the heat exchanger is in direct contact with the water, Stiebel uses a "wrap-around" condenser. This means the heat exchange happens on the outside of the inner cylinder. The big benefit? It eliminates the risk of lime-scale build-up on the exchange surface, ensuring the unit maintains its high efficiency for its entire lifespan—even in areas with "hard" water.
While some heat pumps struggle and freeze up when the frost hits, the WWK 302 H features an active defrost function. It can reliably extract heat from the air down to 0°C. If the temperature drops even further, the "H" model includes a smart 1.5kW backup element to ensure you’re never caught out with a cold shower on a frosty July morning.
This is a huge selling point. Most hot water cylinders use a sacrificial magnesium anode that needs replacing every few years. The WWK 302 H uses an "active" electronic anode. It never needs replacing and provides superior protection against tank corrosion. It’s a massive win for lower long-term maintenance costs.
With over 300 litres of storage, this is one of the largest integrated units on the market. It can easily provide enough hot water for a busy household of 5 or 6 people. Because it stores so much water, it can do most of its "heavy lifting" during the day when the air is warmest (and your solar panels are active), rather than working hard overnight.
The WWK 302 H is designed to play nicely with solar power. It has built-in smarts that allow it to be triggered by your solar PV system. When your roof is producing excess power, the unit can "overheat" the water slightly, essentially acting as a giant thermal battery for your home.
The WWK 302 H is a tall unit (standing about 1.9m high), and it needs room to breathe. It draws air in and exhausts it out the side. You need to ensure there is adequate vertical clearance and that it’s not tucked away in a tiny, unventilated cupboard. Like all heat pumps, it moves a lot of air, so placing it away from bedroom windows is always a pro-tip for a quiet night’s sleep.
If you have teenagers who think a shower is a 20-minute spa session, or if you’re planning on adding an extra bathroom, the 302L capacity gives you that essential "buffer." It’s a high-recovery unit that offers peace of mind for those who never want to worry about running out of hot water.
Stiebel Eltron stands by their German engineering with a very competitive local warranty:
Explore your hot water options over the phone. Talk to Tim today and book a free onsite consultation and quote of all your options. 0800 468 928
